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Dong Z, Yao J, Hu Z, Yang J, Zhang Y. Insight into roles of carbon anodes for removal of refractory organic contaminants in electro-peroxone system: Mechanism, performance and stability. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133957. [PMID: 38452678 DOI: 10.1016/j.jhazmat.2024.133957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 01/29/2024] [Accepted: 03/03/2024] [Indexed: 03/09/2024]
Abstract
Electro-peroxone (EP) is a novel technique for the removal of refractory organic contaminants (ROCs), while the role of anode in this system is neglected. In this work, the EP system with graphite felt anode (EP-GF) and activated carbon fiber anode (EP-ACF) was developed to enhance ibuprofen (IBP) removal. The results showed that 91.2% and 98.6% of IBP was removed within 20 min in EP-GF and EP-ACF, respectively. Hydroxy radical (O⋅H) was identified as the dominant reactive species, contributing 80.9% and 54.0% of IBP removal in EP-ACF and EP-GF systems, respectively. The roles of adsorption in EP-ACF and direct electron transfer in EP-GF cannot be ignored. Due to the differences in mechanism, EP-GF and EP-ACF systems were suitable for the removal of O⋅H-resistant ROCs (e.g., oxalic acid and pyruvic acid) and non-O⋅H-resistant ROCs (e.g., IBP and nitrobenzene), respectively. Both systems had excellent stability relying on the introduction of oxygen functional groups on the anode, and their electrolysis energy consumption was significantly lower than that of EP-Pt system. The three degradation pathways of IBP were proposed, and the toxicity of intermediates were evaluated. In general, carbon anodes have a good application prospect in the removal of ROCs in EP systems.
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Affiliation(s)
- Zekun Dong
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Hangzhou 310058, China
| | - Jie Yao
- Power China Huadong Engineering Corporation Limited, Hangzhou 310023, China
| | - Zhihui Hu
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Hangzhou 310058, China
| | - Jiao Yang
- College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yan Zhang
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Hangzhou 310058, China.
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2
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Hu S, Jin X, Liu M, Li Y, Wang Y, Wei Y, Jin P, Wang XC. Enhanced removal strategy towards organic matter with low coagulability: Immediate entrapment and complexation of oxidized intermediates by the hybrid ozonation-coagulation process. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133288. [PMID: 38154182 DOI: 10.1016/j.jhazmat.2023.133288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 11/30/2023] [Accepted: 12/14/2023] [Indexed: 12/30/2023]
Abstract
The existence of dissolved organic matter (DOM) with low coagulability poses great challenges for conventional coagulation (CC) in water treatment. As a kind of typical organochlorine pesticide, 2,4-dichlorophenoxyacetic acid (2,4-D) cannot be efficiently removed by CC. To enhance the 2,4-D removal, ozonation was applied with coagulation. The hybrid ozonation-coagulation (HOC) achieved 60.61% DOC removal efficiency, which was obviously higher than pre-ozonation coagulation (POC) (45.83%). Synchronous fluorescence spectroscopy revealed stronger complexation between modified 2,4-D and coagulants during the HOC than that in subsequent coagulation of the POC process. During the HOC process, ozone promoted the formation of polymeric Al species, such as Alb. To investigate the 2,4-D removal mechanism, γ-Al2O3/O3 process with the same oxidation ability as the HOC was established. 2,4-D was oxidized step-by-step to 2,4-dichlorophenol, 4,6-dichlororesorcin, 3,5-dichlorocatechol, 2-chlorohydroquinone, 4-chlorocatechol, 1,2,4,5-tetrahydroxybenzene, pentahydroxybenzene and oxalic acid in γ-Al2O3/O3 process. However, during the HOC process, these oxidized intermediates were readily complexed by coagulants and accumulated in flocs. Especially 1,2,4,5-tetrahydroxybenzene and pentahydroxybenzene, completely complexed by AlCl3•6H2O hydrolysates as soon as being formed. Immediate entrapment and complexation between coagulant hydrolysates and 2,4-D oxidized intermediates inhibited the generation of small-molecular-weight organics such as oxalic acid, which enhanced the removal of organics with low coagulability.
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Affiliation(s)
- Shiyi Hu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
| | - Xin Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
| | - Mengwen Liu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
| | - Yao Li
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
| | - Yadong Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
| | - Yixiong Wei
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
| | - Pengkang Jin
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China; School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
| | - Xiaochang C Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China
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Gu J, Li S, Xie J, Song G, Zhou M. Degradation of atrazine by electro-peroxone enhanced by Fe and N co-doped carbon nanotubes with simultaneous catalysis of H 2O 2 and O 3. CHEMOSPHERE 2024; 349:140919. [PMID: 38081520 DOI: 10.1016/j.chemosphere.2023.140919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/01/2023] [Accepted: 12/06/2023] [Indexed: 01/10/2024]
Abstract
Fe and N co-doped carbon nanotubes (Fe-N-CNT) was synthesized and attempted as efficient heterogeneous catalysts for simultaneous catalysis of H2O2 and O3 to improve electro-peroxone (Fe-N-CNT/EP) process efficiency for atrazine (ATZ) degradation. The removal and mineralization of ATZ was significantly enhanced, obtaining the degradation rate constant (k) by Fe-N-CNT/EP (0.23 min-1) about two times that of EP (0.12 min-1) owing to the formation of Fe0 and Fe-N coordination in Fe-N-CNT catalyst for co-catalysis of H2O2 and O3. The important factors such as applied current and ozone concentration were investigated, demonstrating that the optimized performance could be achieved at current of 30 mA and ozone concentration of 55 mg L-1. The oxidation capacity of Fe-N-CNT/EP maintained stably under wide pH range of 3∼7, obtaining the degradation rate constant 1.23-1.92 times that of EP and overcoming the defect of EP at acidic and neutral conditions. Capture experiments and electron paramagnetic resonance (EPR) experiments verified that .OH, generated by accelerating decomposition of H2O2/O3 and peroxone reaction, was the dominant active specie in Fe-N-CNT/EP. Besides, Fe-N-CNT showed high catalytic activity and good stability during six cycles. This work provides an efficient activator for enhanced EP process, exhibiting a promising prospect for water and wastewater purification.
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Affiliation(s)
- Jinyu Gu
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Shasha Li
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Jinxin Xie
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Ge Song
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Minghua Zhou
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
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Mosur Nagarajan A, Subramanian A, Prasad Gobinathan K, Mohanakrishna G, Sivagami K. Electrochemical-based approaches for the treatment of pharmaceuticals and personal care products in wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 344:118385. [PMID: 37392690 DOI: 10.1016/j.jenvman.2023.118385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 05/15/2023] [Accepted: 06/11/2023] [Indexed: 07/03/2023]
Abstract
In recent times, emerging contaminants (ECs) like pharmaceuticals and personal care products (PPCPs) in water and wastewater have become a major concern in the environment. Electrochemical treatment technologies proved to be more efficient to degrade or remove PPCPs present in the wastewater. Electrochemical treatment technologies have been the subject of intense research for the past few years. Attention has been given to electro-oxidation and electro-coagulation by industries and researchers, indicating their potential to remediate PPCPs and mineralization of organic and inorganic contaminants present in wastewater. However, difficulties arise in the successful operation of scaled-up systems. Hence, researchers have identified the need to integrate electrochemical technology with other treatment technologies, particularly advanced oxidation processes (AOPs). Integration of technologies addresses the limitation of indiviual technologies. The major drawbacks like formation of undesired or toxic intermediates, s, energy expenses, and process efficacy influenced by the type of wastewater etc., can be reduced in the combined processes. The review discusses the integration of electrochemical technology with various AOPs, like photo-Fenton, ozonation, UV/H2O2, O3/UV/H2O2, etc., as an efficient way to generate powerful radicals and augment the degradation of organic and inorganic pollutants. The processes are targeted for PPCPs such as ibuprofen, paracetamol, polyparaben and carbamezapine. The discussion concerns itself with the various advantages/disadvantages, reaction mechanisms, factors involved, and cost estimation of the individual and integrated technologies. The synergistic effect of the integrated technology is discussed in detail and remarks concerning the prospects subject to the investigation are also stated.
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Affiliation(s)
- Aditya Mosur Nagarajan
- Industrial Ecology Research Group, School of Chemical Engineering, Vellore Institute of Technology, Vellore, India; Faculty of Process and Systems Engineering, Otto-von-Guericke-Universität, Magdeburg, Germany
| | - Aishwarya Subramanian
- Industrial Ecology Research Group, School of Chemical Engineering, Vellore Institute of Technology, Vellore, India; School of Process Engineering, Technische Universität Hamburg, Hamburg, Germany
| | - Krishna Prasad Gobinathan
- Industrial Ecology Research Group, School of Chemical Engineering, Vellore Institute of Technology, Vellore, India; School of Process Engineering, Technische Universität Hamburg, Hamburg, Germany
| | - Gunda Mohanakrishna
- Center for Energy and Environment (CEE), School of Advanced Sciences, KLE Technological University, Hubli, India.
| | - Krishnasamy Sivagami
- Industrial Ecology Research Group, School of Chemical Engineering, Vellore Institute of Technology, Vellore, India.
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Yang S, Tang J, Zhang X, Zhang A. Degradation of refractory organic matter in MBR effluent from treating landfill leachate by the UV-nZVI-H 2O 2 system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:50295-50308. [PMID: 36792858 DOI: 10.1007/s11356-023-25756-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 02/01/2023] [Indexed: 04/16/2023]
Abstract
In this study, nano zero-valent iron (nZVI) was used as the Fe2+ source in the Fenton reaction, and a UV-nZVI-H2O2 system was constructed to efficiently degrade and mineralize refractory organic matter in landfill leachate. The results showed that under the optimal conditions (initial pH = 3, UV = 14 W, nZVI = 0.5 g/L, and [H2O2] = 30 mM), the removal efficiencies of total organic carbon, absorbance at 254 nm, and color number were 61.38%, 83.89%, and 85.79%, respectively. Control experiments show that the UV-nZVI-H2O2 system has the highest removal rate and mineralization rate of refractory organic matter. The excellent performance of the UV-nZVI-H2O2 system is related to a higher H2O2 utilization rate. The H2O2 residue in the UV-nZVI-H2O2 system was the lowest, and the effective utilization rate of H2O2 was as high as 98.80%. Alcohol quenching experiments and hydroxyl radical quantitative experiments showed that the dominant reactive oxygen species in the UV-nZVI-H2O2 system was HO• and the yield of HO• was as high as 2007.80 μM, which was much higher than that in other systems. The results of spectra analysis showed that the low molecular weight, high fluorescence frequency organic matter, and relatively stable aromatic organic matter were significantly degraded after treatment with the UV-nZVI-H2O2 system and the aromatic degree, humification degree, molecular weight, and molecular polymerization degree of refractory organic matter were also significantly decreased. The mechanism of the UV-nZVI-H2O2 reaction includes homogeneous and heterogeneous Fenton reactions and adsorption and precipitation of organic matter by iron-based colloids. This study can provide theoretical and technical support for the advanced treatment of refractory organic matter in landfill leachate.
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Affiliation(s)
- Siping Yang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Jia Tang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Xiaoqin Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Aiping Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
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6
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Preparation and characterization of M1-Nx-Cy based single atom catalysts for environmental applications. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.108050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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7
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Yang C, Jin X, Guo K, Diao Y, Jin P. Simultaneous removal of organics and ammonia using a novel composite magnetic anode in the electro-hybrid ozonation-coagulation (E-HOC) process toward leachate treatment. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129664. [PMID: 36104898 DOI: 10.1016/j.jhazmat.2022.129664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/13/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
To achieve simultaneous organics and ammonia (NH4+-N) removal toward leachate treatment, this study designed a composite anode (CA+), in which iron powders were attracted to RuO2-IrO2/Ti tube surface by an inserted magnet and utilized in electro-hybrid ozonation-coagulation (E-HOC). The E-HOC (CA+) resulted in higher chemical oxygen demand (COD) and NH4+-N removal with most content of CO2/H2O and gaseous N in product compared with E-HOC (Fe+), electrolysis ozonation and single ozonation. Reactive chlorine species (RCS) and coagulants were co-produced by compositing RuO2-IrO2/Ti and Fe powders, resulting in multiple reactions including electrocoagulation, ozone oxidation, synergistic between ozone and coagulants (SOC), electrolytic chloride and synergistic oxidation between active chlorine and ozone (SCO) occurred. Hydroxyl radical (•OH) generated through SOC reaction was promoted due the RCS generation in E-HOC. The interaction between •OH and Cl-/ClO- also contributed to enhanced Cl•/ClO• production. Consequently, synergy of chlorine, coagulants and ozone enhanced reactive species generation which contributed to favorable organics and NH4+-N removal. Enhanced •OH and RCS are also attributed to conversion of bio-refractory organics like polyphenol, polycyclic aromatics and S-containing to biodegradable ones, e.g., aliphatic compounds and CHO. This study provides an easily operating strategy for leachate treatment with high content organics and NH4+-N.
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Affiliation(s)
- Chao Yang
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Xin Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Kun Guo
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Yue Diao
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Pengkang Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
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Yuan B, Yao J, Wang Z, Dai L, Zhao M, Hrynsphan D, Tatsiana S, Chen J. Increasing N,N-dimethylacetamide degradation and mineralization efficiency by co-culture of Rhodococcus ruber HJM-8 and Paracoccus communis YBH-X. CHEMOSPHERE 2022; 303:134935. [PMID: 35561776 DOI: 10.1016/j.chemosphere.2022.134935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/24/2022] [Accepted: 05/07/2022] [Indexed: 06/15/2023]
Abstract
In this work, Rhodococcus ruber HJM-8 and Paracoccus communis YBH-X were isolated and used to enhance N,N-dimethylacetamide (DMAC) degradation and mineralization efficiencies. The monoculture and co-culture of the two strains for DMAC degradation were compared; results indicated that, a degradation efficiency of 97.62% was obtained in co-culture, which was much higher than that of monocultures of HJM-8 (57.34%) and YBH-X (34.02%). The degradation mechanism showed that co-culture could efficiently improve extracellular polymeric substances production, electron transfer, and microbial activity. Meanwhile, the mineralization mechanism suggested that acetate was the dominant intermediate which had an inhibitory effect on HJM-8, and co-culture was conducive to mineralization due to the high performance of acetate conversion and Na+ K+-ATPase vitality. Besides, a pathway of DMAC biodegradation was proposed for co-culture: DMAC was degraded into acetate by HJM-8, then the accumulated acetate was mineralized by YBH-X. Additionally, the co-culture system was further optimized by Box-Behnken design.
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Affiliation(s)
- Bohan Yuan
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, China
| | - Jiachao Yao
- College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
| | - Zeyu Wang
- Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310015, China
| | - Luyao Dai
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, China
| | - Min Zhao
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, China
| | - Dzmitry Hrynsphan
- Research Institute of Physical and Chemical Problems, Belarusian State University, Minsk, 220030, Belarus
| | - Savitskaya Tatsiana
- Research Institute of Physical and Chemical Problems, Belarusian State University, Minsk, 220030, Belarus
| | - Jun Chen
- College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China; Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310015, China.
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Yang C, Jin X, Hu S, Guo Y, Qian Z, Jin P. Enhanced removal of organics and ammonia by a composite anode in the electrochemically assisted ozonation (EAO) processes with reduced sludge and alleviated passivation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Wang Y, Yu G. Challenges and pitfalls in the investigation of the catalytic ozonation mechanism: A critical review. JOURNAL OF HAZARDOUS MATERIALS 2022; 436:129157. [PMID: 35605501 DOI: 10.1016/j.jhazmat.2022.129157] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 04/30/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Catalytic ozonation is a promising technology for pollutant abatement in water and wastewater treatment. However, there are many controversies and contradictions regarding the mechanisms of catalytic ozonation in literature, which has seriously confounded the development of the technology towards industrial applications. Herein, a critical review of literature is conducted to reveal possible underlying causes of the controversies and contradictions, and several common pitfalls in the experimental design and data interpretation are identified, e.g., the fundamentally flawed quenching method popularly used for evaluating the role of reactive oxygen species for pollutant abatement in catalytic ozonation and the neglect of monitoring ozone transfer doses in lab-scale experiments. Based on the identified pitfalls, several measures are suggested to improve the experimental design and data interpretation of catalytic ozonation studies. In addition, recent advances in mechanistic understanding of catalytic ozonation by principle-based modelling approaches are described. Finally, additional works that are needed to shrink the gap between academic research and practical applications and the prospect of catalytic ozonation in future water and wastewater treatment systems are analyzed.
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Affiliation(s)
- Yujue Wang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China.
| | - Gang Yu
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China
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11
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Yang C, Zhang L, Hu S, Diao Y, Jin X, Jin P, Chen C, Wu X, Wang XC. Electro-dissolved ozone flotation (E-DOF) integrated anoxic/oxic membrane reactor for leachate treatment from a waste transfer station. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:55803-55815. [PMID: 35320482 DOI: 10.1007/s11356-022-19526-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 02/25/2022] [Indexed: 06/14/2023]
Abstract
With high organics and ammonia, leachate from waste transfer stations (WTSs) is among the most complex wastewater that cannot be easily disposed by signal biological processes. In this study, an electro-dissolved ozone flotation (E-DOF) was established, in which dissolved ozone flotation (DOF) and electro-coagulation (EC) occurred concurrently in one unit and integrated with anoxic/oxic membrane bioreactor (A/O-MBR) to dispose leachate from a WTS. In the integrated reactor, E-DOF acted as pretreatment and advanced treatment unit. A/O-MBR acted as secondary treatment unit. The E-DOF pretreatment achieved 34.48% COD and 16.96% NH3-N removal efficiency through synergistic effect between EC and DOF. BOD5/COD of leachate was increased from 0.32 to 0.51 after E-DOF pretreatment, indicating the enhancement of biodegradability. Molecular weight distribution (MWD) and three-dimensional excitation-emission matrix (3D-EEM) analysis demonstrate that the reduction of molecular weight and elimination of refractory organics through EC, ozone, and their interacted product (•OH) are attributed to biodegradability enhancement in lechate. Microbial community analysis proved that chemoheterotrophy and oxic chemoheterotrophy functions, mainly provided by Truepera, Aquamicrobium, Saprospiraceae, and Lentimicrobiaceae, ensured the efficient degradation of organic in the secondary processes. E-DOF advanced treatment effectively disposed residual contaminant in MBR effluent. The E-DOF advanced treatment mainly disposed residual contaminant in MBR effluent. High removal efficiency of COD (98.59 ± 0.27%), NH3-N (95.59 ± 0.50%), TN (95.37 ± 0.73%), and TP (96.75 ± 1.66%) were observed in the integrated reactor, and final effluent met the discharge standards for inclusion in the sewage pipe network in China.
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Affiliation(s)
- Chao Yang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi'an, 710055, Shaanxi Province, China
| | - Lei Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi'an, 710055, Shaanxi Province, China
| | - Shiyi Hu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi'an, 710055, Shaanxi Province, China
| | - Yue Diao
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi'an, 710055, Shaanxi Province, China
| | - Xin Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province, China
| | - Pengkang Jin
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi'an, 710055, Shaanxi Province, China.
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province, China.
| | - Chong Chen
- Jiang Su Yong Guan Water and Wastewater Equipment Co. Ltd, Jiangsu Province, Xu'zhou, 221100, China
| | - Xia Wu
- Jiang Su Yong Guan Water and Wastewater Equipment Co. Ltd, Jiangsu Province, Xu'zhou, 221100, China
| | - Xiaochang C Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi'an, 710055, Shaanxi Province, China
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12
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Catalytic ozonation of N, N-dimethylacetamide in aqueous solution by Fe3O4@SiO2@MgO composite: Optimization, degradation pathways and mechanism. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104380] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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13
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Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process. MATERIALS 2022; 15:ma15103731. [PMID: 35629757 PMCID: PMC9144341 DOI: 10.3390/ma15103731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/06/2022] [Accepted: 05/18/2022] [Indexed: 02/01/2023]
Abstract
A novel material of self-shaped ZnO-embedded biomass carbon foam pellets (ZnO@BCFPs) was successfully synthesized and used as fluidized particle electrodes in three-dimensional (3D) electro-peroxone systems for metronidazole degradation. Compared with 3D and 2D + O3 systems, the energy consumption was greatly reduced and the removal efficiencies of metronidazole were improved in the 3D + O3 system. The degradation rate constants increased from 0.0369 min-1 and 0.0337 min-1 to 0.0553 min-1, respectively. The removal efficiencies of metronidazole and total organic carbon reached 100% and 50.5% within 60 min under optimal conditions. It indicated that adding ZnO@BCFPs particle electrodes was beneficial to simultaneous adsorption and degradation of metronidazole due to improving mass transfer of metronidazole and forming numerous tiny electrolytic cells. In addition, the process of metronidazole degradation in 3D electro-peroxone systems involved hydroxyethyl cleavage, hydroxylation, nitro-reduction, N-denitrification and ring-opening. The active species of ·OH and ·O2- played an important role. Furthermore, the acute toxicity LD50 and the bioconcentration factor of intermediate products decreased with the increasing reaction time.
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14
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Guo Y, Long J, Huang J, Yu G, Wang Y. Can the commonly used quenching method really evaluate the role of reactive oxygen species in pollutant abatement during catalytic ozonation? WATER RESEARCH 2022; 215:118275. [PMID: 35305491 DOI: 10.1016/j.watres.2022.118275] [Citation(s) in RCA: 64] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 02/21/2022] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
Reactive oxygen species (ROS) such as hydroxyl radicals (•OH), superoxide radicals (O2•-), and singlet oxygen (1O2) have often been suggested to play a role in ozone-resistant pollutant abatement during catalytic ozonation. However, there are significant controversies regarding their relative importance in literature. Currently, the role of ROS in pollutant abatement is commonly evaluated by the quenching method based on the assumption that the added ROS quenchers (e.g., tert-butanol (TBA) and para-benzoquinone (pBQ)) quench only the target ROS, but do not considerably influence other reaction mechanisms of catalytic ozonation. However, we hypothesized that this assumption is possibly unrealistic and a main cause for the controversies reported in literature. To test this hypothesis, this study evaluated the effects of six commonly used ROS quenchers (TBA, pBQ, methanol (MeOH), 4-chloro-7-nitrobenzo-2-oxa-1,3-dizole (NBD-Cl), furfuryl alcohol (FFA), and sodium azide (NaN3)) on the mechanism of catalytic ozonation with manganese dioxide. The results show that rather than only quenching their target ROS, these quenchers can profoundly change the catalytic ozonation system through various mechanisms, e.g., interrupting the radical chain reaction of O3 decomposition, blocking the active sites of catalysts, and consuming O3 in the system. Due to the significant confounding effects of ROS quenchers on the reaction mechanism, the quenching method actually cannot reveal the role of ROS in pollutant abatement and often misinterpreted the catalytic ozonation mechanism. The results indicate that the commonly used quenching method is probably not an appropriate way to investigate the role of ROS in pollutant abatement during catalytic ozonation, and many previously reported mechanisms obtained with the quenching method may need a revisit.
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Affiliation(s)
- Yang Guo
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China
| | - Jingfei Long
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China
| | - Jun Huang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China
| | - Gang Yu
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China
| | - Yujue Wang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084 China.
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15
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Tuning band structure of graphitic carbon nitride for efficient degradation of sulfamethazine: Atmospheric condition and theoretical calculation. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.08.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Chen L, Wang H, Sun Y, Zhao Y, Shi H. Interface mechanisms of the catalytic ozonation of humic acids over siliceous ferrihydrite: Morphology, stability, and the catalytic process. ENVIRONMENTAL RESEARCH 2022; 203:111870. [PMID: 34390719 DOI: 10.1016/j.envres.2021.111870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 07/05/2021] [Accepted: 08/07/2021] [Indexed: 06/13/2023]
Abstract
Ferrihydrite (Fh), a precursor of more crystalline Fe (hydr)oxides, exhibits decent catalytic behavior; however, the instability of its amorphous structure limits its engineering applications. Siliceous ferrihydrite (FhSi) was readily synthesized in this study by co-precipitation. The formation of Fe-O-Si linkages did not alter the amorphous state of pure Fh, but increased the surface area (SBET), reduced the point of zero charge (pHZPC), and prevented the leaching of more iron. X-ray diffraction, Mössbauer and pyridine-Fourier transform infrared (FTIR) spectroscopies, and potentiometric titration revealed the presence of silicon-occupied portions of growth sites on the Fh surface, which increased the coordination symmetry around the Fe atom and inhibited the transition of Fh to more stable crystalline Fe (hydr)oxides during repeated use. Meanwhile, the density of surface hydroxyl groups (Ds) and the total acid content of the catalytic system after five cycles of catalytic ozonation were 56.75 % and 63.58 % higher than those of freshly prepared system, thereby benefiting the catalysis of ozone for generating ·OH. In addition, the lower pHZPC of the FhSi/O3 system compared to that of the Fh/O3 system promoted the generation of neutral surface-hydroxyl species on the surface of FhSi, which enabled a decent catalytic performance in alkaline solutions, regardless of the catalytic cycle. Moreover, the removal of humic acids (HA) followed a hydroxy radical reaction, which involved self-decomposition (14.15 %), catalytic ozonation (21.58 %), and peroxone and Fenton-like reactions (64.27 %).
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Affiliation(s)
- Lei Chen
- College of Environment & Resource Sciences, Zhejiang University, Hangzhou, 310058, PR China
| | - He Wang
- College of Environment & Resource Sciences, Zhejiang University, Hangzhou, 310058, PR China
| | - Yanping Sun
- College of Environment & Resource Sciences, Zhejiang University, Hangzhou, 310058, PR China
| | - Yue Zhao
- College of Environment & Resource Sciences, Zhejiang University, Hangzhou, 310058, PR China
| | - Huixiang Shi
- College of Environment & Resource Sciences, Zhejiang University, Hangzhou, 310058, PR China.
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17
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Jin X, Zhang S, Yang S, Zong Y, Xu L, Jin P, Yang C, Hu S, Li Y, Shi X, Wang XC. Behaviour of ozone in the hybrid ozonation-coagulation (HOC) process for ibuprofen removal: Reaction selectivity and effects on coagulant hydrolysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 794:148685. [PMID: 34198084 DOI: 10.1016/j.scitotenv.2021.148685] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 06/13/2023]
Abstract
Simultaneous ozonation and coagulation can be realized in one unit in the developed hybrid ozonation-coagulation (HOC) process. To reveal the reaction sequence within the HOC process, the ibuprofen (IBP) removal efficiency of the ozonation only, HOC and HOC-PO43- (inhibition of the reactions between ozone and metal coagulant) processes at pH 5 and different ozone dosages were investigated. The removal efficiency is almost the same for the three processes at a low ozone dosage (4.8 mg/L), and higher removal performance can be achieved by the HOC process with increasing ozone dosage. It can be implied that ozone preferentially reacts with OH- to generate OH which react with IBP in the HOC process, and subsequently reacts with the surface hydroxyl groups of hydrolysed Al species to enhance OH generation. Moreover, based on the kinetics, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) analyses, the synergistic reactions between ozone and the metal coagulants (SOC) started to take effect from ozone dosage of 9.6 mg/L, which further verified that ozone will be involved in the IBP ozonation prior to the SOC reactions. The subsequent SOC reactions also resulted in the increased generation of polymeric Al species and more abundant intermediates in the HOC process.
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Affiliation(s)
- Xin Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Shaohua Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Shengjiong Yang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Yukai Zong
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Lu Xu
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Pengkang Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
| | - Chao Yang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Shiyi Hu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Yao Li
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Xuan Shi
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Xiaochang C Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
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Jin X, Xie X, Zhang S, Yang C, Xu L, Shi X, Jin P, Wang XC. Insights into the electro-hybrid ozonation-coagulation process-Significance of connection configurations and electrode types. WATER RESEARCH 2021; 204:117600. [PMID: 34488141 DOI: 10.1016/j.watres.2021.117600] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 08/20/2021] [Accepted: 08/22/2021] [Indexed: 06/13/2023]
Abstract
The electro-hybrid ozonation-coagulation process (E-HOC) integrates electrocoagulation (EC) and ozonation simultaneously in a single unit. Nevertheless, the performance of the EC process is highly dependent on the polar connection configuration (monopolar vs. bipolar connection) and the type of generated coagulants (single-coagulant vs. dual-coagulants). In this study, the removal efficiency of the E-HOC process with different connection configurations and types of coagulants was assessed. The E-HOC process with bipolar connection (BE-HOC) exhibited higher removal efficiency for wastewater treatment plant (WWTP) effluent organic matter and ibuprofen (IBP) compared with the E-HOC process with monopolar connection (ME-HOC). Furthermore, dual-coagulant generation (released from both Al and Fe electrodes) in the BE-HOC process greatly improved the WWTP effluent organic matter and IBP removal efficiency. Lower energy consumption was observed for the BE-HOC process compared with the ME-HOC process. It was found that ozonation promoted the polymerization reactions during coagulant hydrolyzis in the E-HOC process. Compared with the ME-HOC process, the BE-HOC configuration and dual-coagulant mode further facilitated polymeric hydrolyzed coagulant species formation, thereby improving ozone catalytic and coagulation performance. According to trapping experiments and EPR analysis, •OH formation was enhanced in the BE-HOC process and dual-coagulant mode. In addition, more active reaction sites of generated hydrolyzed coagulant species were observed with bipolar connection and in the dual-coagulant generation mode based on X-ray photoelectron spectroscopy (XPS) analysis.
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Affiliation(s)
- Xin Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Xinyue Xie
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Shaohua Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Chao Yang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
| | - Lu Xu
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Xuan Shi
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Pengkang Jin
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
| | - Xiaochang C Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China
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19
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Zheng Y, Zhuang W, Zhao M, Zhang J, Song Y, Liu S, Zheng H, Zhao C. Role of driven approach on the piezoelectric ozonation processes: Comparing ultrasound with hydro-energy as driving forces. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126392. [PMID: 34329025 DOI: 10.1016/j.jhazmat.2021.126392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/09/2021] [Accepted: 06/09/2021] [Indexed: 06/13/2023]
Abstract
Driven approach is vital for evaluating degradation and energy efficiencies of piezocatalysis process. Thus, piezoelectric ozonation processes driven by hydraulic (HPE-O3) and ultrasonic (UPE-O3) forces were compared systematically, using BaTiO3 as piezoelectric material for ibuprofen (IBP) degradation. The synergy indexes of HPE-O3 and UPE-O3 processes were 4.51 and 5.78, respectively. Besides, UPE-O3 process (88.84%) achieved better mineralization efficiency than HPE-O3 process (68.80%) in 90 min. Nevertheless, the energy consumptions of HPE-O3 process was only 4.01‰ of UPE-O3 process. The formation rate and concentration of •OH (the dominant active species in both processes) in UPE-O3 process were 2-3 times higher than that in HPE-O3 process. Notably, piezoelectric potential and current density driven by ultrasound were approximately 47500-fold and 40-fold than those by hydro-energy, respectively. These led to the difference of •OH paths between HPE-O3 and UPE-O3 processes. Further analyses indicated that •OH was mainly generated by single-electron transfer without H2O2 generation in HPE-O3 process, whereas both single- and double-electron transfer (with H2O2 generation) contributed to the production of •OH in UPE-O3 process. This study revealed the mechanism of piezoelectric ozonation process with different driven approaches and may provide valuable reference for selection of driven approaches in piezocatalytic study and application.
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Affiliation(s)
- Ying Zheng
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Wei Zhuang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Mengshang Zhao
- School of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, PR China
| | - Jian Zhang
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832003, PR China
| | - Yunqian Song
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Shuan Liu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, PR China
| | - Huaili Zheng
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Chun Zhao
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China.
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20
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Li W, Li C, Zhu N, Yuan H, Shen Y. The extent of sludge solubilization allows to estimate the efficacy of ozonation for removal of polycyclic aromatic hydrocarbons (PAHs) in municipal sewage sludge. JOURNAL OF HAZARDOUS MATERIALS 2021; 413:125404. [PMID: 33609868 DOI: 10.1016/j.jhazmat.2021.125404] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 02/03/2021] [Accepted: 02/09/2021] [Indexed: 06/12/2023]
Abstract
Ozone treatment has been proven as an effective technology for removing PAHs in municipal sewage sludge. However, given the complex interaction of PAHs with sludge extracellular polymeric substances (EPS), effective sludge disintegration is required to make PAHs more accessible to oxidants, which also affects PAHs partitioning. Here, we investigated two treatment systems, namely ozonation (ozone) and sequential hydrodynamic cavitation and ozonation (HC+ozone), under varied conditions, to determine whether the extent of sludge disintegration can estimate a measurable removal of PAHs. The results showed that both the PAHs removal efficiency and kinetics highly depended on pH and ozone dose. Although no significant removal of PAHs occurred during HC treatment, the observed rate constants for Σ16 PAHs removal in HC+ozone system were 1.2-1.4-fold higher than those obtained in ozone system under the same condition. The accelerated PAHs removal could be attributed to the reduced flocs size (80% smaller) and increased soluble EPS concentration (5-fold higher) with HC pretreatment. Lastly, a positive correlation was noted between the PAHs removal efficiency and soluble EPS concentration (R2 = 0.85), indicating the important role of dissolved and colloidal matter (DCM) for PAHs partitioning between aqueous and particulate phases.
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Affiliation(s)
- Wenhao Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Chao Li
- Hunan BISEN Environmental & Energy Co. Ltd., Changsha 410100, China
| | - Nanwen Zhu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200292, China
| | - Haiping Yuan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Yanwen Shen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Hunan BISEN Environmental & Energy Co. Ltd., Changsha 410100, China.
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21
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Yang K, Sun Z, Wang L, Lou Z. Decomposition of oil refinery sludge using E +-Ozonation process for carbon source releasing and TPH removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:26913-26922. [PMID: 33496952 DOI: 10.1007/s11356-021-12452-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Accepted: 01/08/2021] [Indexed: 06/12/2023]
Abstract
To utilize carbon source and decompose the petroleum hydrocarbon substances simultaneously, adding the electrolysis to ozonation (E+-Ozonation) was employed to deal with hazardous activated petroleum waste sludge (P-sludge). It was found that E+-Ozonation could accelerate the ozone utilization and hydroxyl radical (·OH) generation rate. Soluble chemical oxygen demand (SCOD) increased around 16.3 times than the control one (from 471 to 7700 mg/L). The potential carbon source, such as the short-chain carbon of acetate and propionate, increased from 50 to 1088 mg/L and from 27 to 614 mg/L respectively, and approximately accounted for a quarter of total SCOD. Total petroleum hydrocarbon (TPH) decomposition was observed with a much higher removal rate of 84.3% simultaneously, and the substances with the function group of C=C and C-C bonds decomposed greatly. The long- and medium-chain substances in TPH were converted into the short-chain substances (90% of C28-C40 of hydrocarbons was removed, while C10-C18 increased by 13.8%). E+-Ozonation process could be one of the promising methods for P-sludge decomposition through carbon source releasing and TPH removal.
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Affiliation(s)
- Kaiyan Yang
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China
| | - Zhiyi Sun
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Luochun Wang
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China.
| | - Ziyang Lou
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
- China Institute for Urban Governance, Shanghai Jiao Tong University, Shanghai, 200240, China.
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22
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Chen H, Wang J. Degradation and mineralization of ofloxacin by ozonation and peroxone (O 3/H 2O 2) process. CHEMOSPHERE 2021; 269:128775. [PMID: 33162160 DOI: 10.1016/j.chemosphere.2020.128775] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/22/2020] [Accepted: 10/25/2020] [Indexed: 06/11/2023]
Abstract
The degradation and mineralization of ofloxacin (OFX) by ozonation and peroxone process (O3/H2O2) was investigated. The influence of operational conditions and inorganic anions on the mineralization of OFX were also studied. Results showed that OFX could be rapidly oxidized by both O3 alone and O3/H2O2 process. The mineralization of OFX was significantly enhanced (55%) in peroxone process, compared with that in ozonation alone (30%). The direct oxidation of OFX by ozone molecules might account for the degradation of OFX in both ozonation and peroxone process, whereas, in the presence of H2O2, the improvement of the ozone decomposition and the formation of OH radicals were responsible for enhancing OFX mineralization. The applied dosage of H2O2 and O3 was important for the performance of peroxone process in OFX mineralization. The addition of HCO3- and PO43- enhanced OFX mineralization, while the presence of Cl- and NO3- had negative effect on OFX mineralization in both ozonation and peroxone processes. Ozonation process might be a promising technology for the degradation of OFX, while the combination process of O3/H2O2 could be an effective method for the improvement of the mineralization of refractory organic pollutants.
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Affiliation(s)
- Hai Chen
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, China; Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, China.
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Wang J, Liu H, Ma D, Wang Y, Yao G, Yue Q, Gao B, Wang S, Xu X. Degradation of organic pollutants by ultraviolet/ozone in high salinity condition: Non-radical pathway dominated by singlet oxygen. CHEMOSPHERE 2021; 268:128796. [PMID: 33158505 DOI: 10.1016/j.chemosphere.2020.128796] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 09/15/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
In this work, the combined ultraviolet ozone process (UV/O3) was applied for organic contaminant (Reactive Blue K-GL, RB) degradation in high salinity. The degradation rates of RB in both O3 and UV/O3 systems were enhanced by NaCl (the k increased from 0.080 to 0.116 to 0.132 and 0.267 min-1 respectively), while mineralization rate varied at different salt conditions. In addition, UV irradiation promoted the degradation efficiency of RB with the presence of salt. Singlet oxygen (1O2) was the primary active species in the UV/O3 system. The quenching experiments and signal intensity of 1O2 corresponded well to the mineralization of RB. Under conditions of high salinity and high pH, O3 has high mass transfer coefficient (kLa, 3.303 min-1) and self-decomposition (kd, 0.600 min-1), which further promoted the formation of 1O2 for mineralization of RB. Furthermore, UV/O3 system was efficient in real textile wastewater treatment (CODCr removal rate 91.7% and decolorization rate 98.7%).
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Affiliation(s)
- Jie Wang
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
| | - Haibao Liu
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
| | - Defang Ma
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
| | - Yan Wang
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
| | - Guangping Yao
- Shandong Shanda WIT Science and Technology Co., Ltd., Jinan, 250061, Shandong, PR China
| | - Qinyan Yue
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
| | - Baoyu Gao
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China.
| | - Shue Wang
- School of Public Health, Shandong University, Jinan, 250012, PR China.
| | - Xing Xu
- Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
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Xiong Z, Li J, Li Y, Yuan Y, Jiang Y, Yao G, Lai B. Simultaneously enhanced degradation of N, N-dimethylacetamide and reduced formation of iron sludge by an efficient electrolysis catalyzed ozone process in the presence of dissolved silicate. JOURNAL OF HAZARDOUS MATERIALS 2021; 406:124725. [PMID: 33290911 DOI: 10.1016/j.jhazmat.2020.124725] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 11/25/2020] [Accepted: 11/26/2020] [Indexed: 06/12/2023]
Abstract
The generation of sludge is the main issue in iron-based electrochemical techniques. Interestingly, in this study, the effluent was totally limpid and iron sludge did not generate when dissolved silicate (Na2SiO3) was used as the electrolyte in an electrolysis catalyzed ozone (ECO-Na2SiO3) system. More importantly, the pseudo-first-order rate constants (0.112 min-1) for DMAC degradation in ECO-Na2SiO3 process was much higher than those of ECO systems using other electrolytes. An inhibition film formed on the iron electrode surface was identified to inhibit excess corrosion of iron electrodes and efficiently catalyze decomposition of ozone simultaneously. It was confirmed that hydroxyl radical (•OH) played a dominant role for the degradation of DMAC, and O2•- and H2O2 were also contained in ECO-Na2SiO3 system. The contributions of contained oxidative reactions in ECO-Na2SiO3 system were quantitatively evaluated. Finally, the degradation pathway of DMAC was proposed. This work provides an effective way for protecting electrode from corrosion in electrochemical process.
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Affiliation(s)
- Zhaokun Xiong
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Jiayi Li
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - You Li
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Yue Yuan
- National Engineering Research Center of Clean Technology in Leather Industry, College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China.
| | - Yanni Jiang
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Gang Yao
- Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China; Institute of Environmental Engineering, RWTH Aachen University, Germany
| | - Bo Lai
- State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China.
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25
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Yan P, Chen Z, Wang S, Zhou Y, Li L, Yuan L, Shen J, Jin Q, Zhang X, Kang J. Catalytic ozonation of iohexol with α-Fe 0.9Mn 0.1OOH in water: Efficiency, degradation mechanism and toxicity evaluation. JOURNAL OF HAZARDOUS MATERIALS 2021; 402:123574. [PMID: 32759003 DOI: 10.1016/j.jhazmat.2020.123574] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 07/10/2020] [Accepted: 07/22/2020] [Indexed: 06/11/2023]
Abstract
Iohexol, a widely used iodinated X-ray contrast media, is difficult to completely degrade with the traditional water treatment process. Catalytic ozonation with synthesized α-Fe0.9Mn0.1OOH as the catalyst can significantly promote the degradation of iohexol relative to that with ozonation alone. Hydroxyl radicals play a predominant role during the degradation of iohexol. The effect of various factors, including catalyst dose, ozone dose, iohexol concentration and water matrix factors, on the catalytic performance were investigated. The presence of α-Fe0.9Mn0.1OOH in the catalytic system can significantly promote the removal of iohexol and mineralization of the dissolved organic carbon in real water samples. The intermediate products were determined by high-resolution liquid chromatography, and the reaction site was predicted by frontier electron density (FED) calculations. The degradation mechanism of iohexol followed the processes of H-abstraction, amide hydrolysis, amide oxidation, and ·OH substitution. Higher exposure concentrations of iohexol had a negative effect on the survival and hatching rates in the development of zebrafish embryos. The autonomic movement process and heartbeat rate of the zebrafish larvae showed significant differences as the exposure concentration of iohexol increased. The catalytic ozonation process with α-Fe0.9Mn0.1OOH can decrease the toxicity of iohexol containing water.
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Affiliation(s)
- Pengwei Yan
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Zhonglin Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Shuyu Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Yanchi Zhou
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Li Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; School of Life Science and Technology, Harbin Institute of Technology, Harbin 150080, PR China
| | - Lei Yuan
- National and Provincial Joint Engineering Laboratory of Wetland Ecological Conservation, Heilongjiang Academy of Science, Harbin, 150040, PR China
| | - Jimin Shen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Qianqian Jin
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Xiaoxiao Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Jing Kang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
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26
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Ghasemi M, Khataee A, Gholami P, Soltani RDC, Hassani A, Orooji Y. In-situ electro-generation and activation of hydrogen peroxide using a CuFeNLDH-CNTs modified graphite cathode for degradation of cefazolin. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 267:110629. [PMID: 32349954 DOI: 10.1016/j.jenvman.2020.110629] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 03/27/2020] [Accepted: 04/17/2020] [Indexed: 06/11/2023]
Abstract
The modified multifunctional electrodes for electro-Fenton (EF) process are suggested to be promising cathodes for in situ electro-generation and activation of H2O2 to produce hydroxyl radicals (•OH). However, heterogeneous EF process still faces the challenges of limited catalytic activity and releasing of massive amounts of transition metals to the solution after removal of organic pollutants. The main aim of the present investigation was to prepare a cathode containing carbon nanotubes (CNTs) and CuFe nano-layered double hydroxide (NLDH) for degradation and mineralization of cefazolin antibiotic through electro-Fenton process. Structural and electrochemical analyses demonstrated that CuFeNLDH-CNTs nanocomposite was successfully incorporated on the surface of graphite cathode. Due to the increased formation of •OH in the reactor, the incorporation of CNTs into NLDH matrix with a catalyst loading of 0.1 g substantially improved the degradation efficiency of cefazolin (89.9%) in comparison with CNTs-coated (28.7%) and bare graphite cathode (22.8%) within 100 min. In the presence of 15 mM of ethanol, the degradation efficiency of cefazolin was remarkably decreased to 43.7% by the process, indicating the major role of •OH in the destruction of target molecules. Acidic conditions favored the degradation efficiency of cefazolin by the modified EF process. Mineralization efficiency of the bio-refractory compound was obtained to be 70.1% in terms of chemical oxygen demand (COD) analysis after 300 min. The gas chromatography-mass spectroscopy (GC-MS) analysis was also implemented to identify the intermediate byproducts generated during the degradation of cefazolin in the CuFeNLDH-CNTs/EF reactor.
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Affiliation(s)
- Masoumeh Ghasemi
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran
| | - Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran; Department of Environmental Engineering, Gebze Technical University, 41400 Gebze, Turkey; Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam.
| | - Peyman Gholami
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran; Department of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Reza Darvishi Cheshmeh Soltani
- Department of Environmental Health Engineering, School of Health, Arak University of Medical Sciences, 38196-93345, Arak, Iran
| | - Aydin Hassani
- Department of Materials Science and Nanotechnology Engineering, Faculty of Engineering, Near East University, 99138, Nicosia, TRNC, Mersin 10, Turkey
| | - Yasin Orooji
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China.
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27
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Olmez-Hanci T, Dogruel S, Emek ADA, Yılmazer CE, Çınar S, Kiraz O, Citil E, Orhon AK, Siltu E, Gucver SM, Ozgun OK, Tanik A, Yetis U. Performance of ozone and peroxone on the removal of endocrine disrupting chemicals (EDCs) coupled with cost analysis. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:640-650. [PMID: 32970617 DOI: 10.2166/wst.2020.339] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Micropollutants such as endocrine disruptors are one of the most important groups of chemicals polluting water resources. Conventional treatment systems may not be effective for the removal of endocrine disrupting chemicals (EDCs), and the fate of these chemicals should be carefully monitored in the effluent of wastewater treatment plants (WWTPs). Additional treatment methods such as advanced oxidation processes can be used for the removal of endocrine disruptors. This study presents the existence of endocrine disruptors in 4 different effluents: (i) municipal WWTP effluent, (ii) textile industry WWTP effluent, (iii) organized industrial zone (OIZ) WWTP effluent and (iv) pharmaceutical industry discharge and also presents their removal efficiencies by ozonation and peroxone oxidation. A broad spectrum of removal efficiencies was observed for the EDCs present in the samples since the oxidation efficiency of wastewaters containing EDCs mainly depends on the wastewater matrix and on the type of the EDCs. Ozonation was found to be a lower-cost option than peroxone oxidation at the investigated conditions.
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Affiliation(s)
- T Olmez-Hanci
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey E-mail:
| | - S Dogruel
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey E-mail:
| | - A D Allar Emek
- ITUNOVA Technology Inc., Istanbul Technical University, Ayazaga Campus, 34469, Maslak, Istanbul, Turkey
| | - C Eropak Yılmazer
- ITUNOVA Technology Inc., Istanbul Technical University, Ayazaga Campus, 34469, Maslak, Istanbul, Turkey
| | - S Çınar
- ITUNOVA Technology Inc., Istanbul Technical University, Ayazaga Campus, 34469, Maslak, Istanbul, Turkey
| | - O Kiraz
- ITUNOVA Technology Inc., Istanbul Technical University, Ayazaga Campus, 34469, Maslak, Istanbul, Turkey
| | - E Citil
- ITUNOVA Technology Inc., Istanbul Technical University, Ayazaga Campus, 34469, Maslak, Istanbul, Turkey
| | - A Koc Orhon
- General Directorate of Water Management, Republic of Turkey Ministry of Agriculture and Forestry, 06560, Yenimahalle, Ankara, Turkey
| | - E Siltu
- General Directorate of Water Management, Republic of Turkey Ministry of Agriculture and Forestry, 06560, Yenimahalle, Ankara, Turkey
| | - S M Gucver
- General Directorate of Water Management, Republic of Turkey Ministry of Agriculture and Forestry, 06560, Yenimahalle, Ankara, Turkey
| | - O Karahan Ozgun
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey E-mail:
| | - A Tanik
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey E-mail:
| | - U Yetis
- Environmental Engineering Department, Middle East Technical University, 06800 Çankaya, Ankara, Turkey
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28
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Jin X, Liu Y, Wang Y, Zhang S, Zhang W, Jin P, Xu L, Shi X, Wang XC, Lv S. Towards a comparison between the hybrid ozonation-coagulation (HOC) process using Al- and Fe-based coagulants: Performance and mechanism. CHEMOSPHERE 2020; 253:126625. [PMID: 32289602 DOI: 10.1016/j.chemosphere.2020.126625] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 03/19/2020] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
In this study, the removal performance of a hybrid ozonation-coagulation (HOC) process using AlCl36H2O (Al-HOC) and FeCl36H2O (Fe-HOC) as coagulants for the treatment of wastewater treatment plant (WWTP) effluent and ibuprofen (IBP) was investigated. Compared with the conventional coagulation process and pre-ozonation-coagulation process, much better organic matter removal performance can be achieved for both the Al-HOC and Fe-HOC processes. The Fe-HOC process showed an obviously higher dissolved organic carbon (DOC) removal efficiency than that of the Al-HOC process. Surface hydroxyl groups were determined to be the active sites in generating OH in the HOC process, and the hydrolysed Fe species possessed a higher content of surface hydroxyl groups than the hydrolysed Al species according to fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectra (XPS) analyses. In addition, the hydrolysed Fe species contained a higher portion of tetrahedral sites that were more likely to be stronger Lewis acid sites to react with ozone to generate OH. Furthermore, peroxone reactions in the HOC process were other possible way to enhance the OH generation, and higher H2O2 generation was observed in the Fe-HOC process due to higher O2- generation. Therefore, better removal performance of the Fe-HOC process can be obtained due to the increased OH generation in the Fe-HOC process.
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Affiliation(s)
- Xin Jin
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Yuguo Liu
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Yong Wang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Shaohua Zhang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Weijie Zhang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Pengkang Jin
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Lu Xu
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Xuan Shi
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Xiaochang C Wang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Shiwen Lv
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
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29
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Li Q, Li X, Sun J, Song H, Wu J, Wang G, Li A. Removal of organic and inorganic matters from secondary effluent using resin adsorption and reuse of desorption eluate using ozone oxidation. CHEMOSPHERE 2020; 251:126442. [PMID: 32169715 DOI: 10.1016/j.chemosphere.2020.126442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 03/05/2020] [Accepted: 03/06/2020] [Indexed: 06/10/2023]
Abstract
This study aimed to compare the effectiveness of MAER and L20 resin for the adsorption treatment of secondary effluent, and evaluate the applicability of ozone oxidation for the reuse of desorption eluate. Bench-scale adsorption experiments showed that the MAER resin exhibited higher efficiency than L20 resin in removal of COD within 600 treated bed volumes (BV), which declined from 32.5% to 14.1% in the first and sixth treatment loading of 100 BV. On the other hand, the L20 resin displayed obviously higher removal efficiency of total nitrogen (TN) than MAER resin within 600 BV, which dropped from 74.6% to 9.8% at the same condition. The ozone oxidation treatment could achieve desirable reuse of desorption eluate, although its chemical oxygen demand (COD) concentration increased gradually in line with the reuse numbers. The uptake of COD, TN and total phosphorus declined steadily by using ozone treated eluate as the regenerant in successive adsorption-desorption cycles, but increased obviously with a new batch of regenerant. Overall, the resin adsorption could efficiently remove organic and inorganic matters from secondary effluent, while the treatment loop including desorption eluate oxidation and eluate reuse could markedly enhance the concentration ratio of treated effluent.
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Affiliation(s)
- Qimeng Li
- School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
| | - Xiang Li
- School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China
| | - Jing Sun
- School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China
| | - Haiou Song
- School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China
| | - Ji Wu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
| | - Guoxiang Wang
- School of Geography, School of Environment, Nanjing Normal University, Nanjing, 210023, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China.
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
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30
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Jin X, Xie X, Liu Y, Wang Y, Wang R, Jin P, Yang C, Shi X, Wang XC, Xu H. The role of synergistic effects between ozone and coagulants (SOC) in the electro-hybrid ozonation-coagulation process. WATER RESEARCH 2020; 177:115800. [PMID: 32315900 DOI: 10.1016/j.watres.2020.115800] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 03/23/2020] [Accepted: 04/04/2020] [Indexed: 06/11/2023]
Abstract
In order to improve the dissolved organic matter removal efficiency, an electro-hybrid ozonation-coagulation (E-HOC) system was developed in this study, in which the electro-coagulation (EC) and ozonation occurred simultaneously in one integrated unit. Higher removal efficiency was observed for the E-HOC process compared with those of EC, ozonation and pre-ozonation-EC process for the treatment of wastewater treatment plant (WWTP) effluent and ibuprofen (IBP). 58.6% dissolved organic carbon (DOC) removal efficiency was achieved in the E-HOC process for the treatment of WWTP effluent at optimal operational condition (current density 15 mA/cm2, initial pH 5 and ozone dosage 1.5 mg O3/mg DOC). Based on the reactive oxygen species (ROS) detection and reactions on the electrodes, the synergistic effects between ozone and coagulants (SOC) were found to be involved in the E-HOC process. According to pseudo-first-order rate constant analyses, the contribution of five possible organic removal pathways was quantified. It was revealed that the peroxone and SOC effects exhibited almost equal contribution to IBP removal at initial pH 5 under different current densities, both of which played the dominant role in the E-HOC process. However, the contribution of the SOC effects decreased significantly when the initial pH increased to 7 and 9. As an important pathway for organic removal in the E-HOC process at initial pH 5, the mechanism of the SOC effects was analysed at initial pH 5. It was revealed the SOC effects can further improve hydroxyl radicals (•OH) generation, and the surface hydroxyl groups of the hydrolysed Al species generated from anode electrolysis were determined to be the active sites to generate ROS in the SOC effects.
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Affiliation(s)
- Xin Jin
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Xinyue Xie
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Yuguo Liu
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Yong Wang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Rui Wang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Pengkang Jin
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Chao Yang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Xuan Shi
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Xiaochang C Wang
- Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Huining Xu
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
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31
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González T, Dominguez JR, Correia S. Neonicotinoids removal by associated binary, tertiary and quaternary advanced oxidation processes: Synergistic effects, kinetics and mineralization. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 261:110156. [PMID: 32148258 DOI: 10.1016/j.jenvman.2020.110156] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 12/20/2019] [Accepted: 01/16/2020] [Indexed: 05/24/2023]
Abstract
The degradation of four representative neonicotinoids, namely Thiamethoxam, Imidacloprid, Acetamiprid and Thiacloprid, was carried out by the sequential association of different advanced oxidation processes, including Ozonation, Electro-chemical Oxidation, Ultrasound, Ultraviolet radiation, and their different possible associations. There are no published papers in the literature on the removal of this type of insecticides through these associated oxidation processes. Single oxidation processes did not achieve total pollutants removal in less than 3 h (only UV radiation treatment obtain a total removal of Thiamethoxan in 150 min, but with mineralization below 15% TOC). For double sequential processes, Electro-oxidation-Ozone treatment obtains a total removal of Imidacloprid in 120 min and an increase of mineralization to 50% TOC. Three or four sequential processes are recommended to improve degradation and mineralization rates in a significant way, Electro-oxidation-Ozone-UV treatment obtains a total removal of Thiamethoxan in 80 min with mineralization over 75% TOC. These results confirm important synergistic effects which were quantified. The global trend indicates that Thiamethoxam is the most oxidizable neonicotinoid, whereas Acetamiprid is the most recalcitrant compound. The degradation rate of each neonicotinoid followed pseudo-first-order kinetics and the different oxidation pathways were also quantified from a kinetic point of view.
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Affiliation(s)
- Teresa González
- Department of Chemical Engineering and Physical Chemistry, Area of Chemical Engineering, Faculty of Sciences, University of Extremadura, Avda. de Elvas, s/n, 06006, Badajoz, Spain.
| | - Joaquin R Dominguez
- Department of Chemical Engineering and Physical Chemistry, Area of Chemical Engineering, Faculty of Sciences, University of Extremadura, Avda. de Elvas, s/n, 06006, Badajoz, Spain.
| | - Sergio Correia
- Department of Chemical Engineering and Physical Chemistry, Area of Chemical Engineering, Faculty of Sciences, University of Extremadura, Avda. de Elvas, s/n, 06006, Badajoz, Spain
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32
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Diao ZH, Dong FX, Yan L, Chen ZL, Qian W, Kong LJ, Zhang ZW, Zhang T, Tao XQ, Du JJ, Jiang D, Chu W. Synergistic oxidation of Bisphenol A in a heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate process: Reactivity and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121385. [PMID: 31606253 DOI: 10.1016/j.jhazmat.2019.121385] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 09/27/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
Recently, clean-up of resistant organic compounds has attracted growing attention. In this study, a novel heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate (BC/PS/US) process was firstly developed for the degradation of bisphenol A (BPA) in water. The results revealed that BC/PS/US process could successfully achieve a positively synergistic effect between sonochemistry and catalytic chemistry on the degradation of BPA compared to its corresponding comparative process. Nearly 98% of BPA could be degraded within 80 min at optimum reaction conditions. The coexisting substances including Cl-, SO42- and NO3- had no obvious inhibition on the BPA degradation, whereas HCO3- and humic acid (HA) had significant inhibition effects on that. PS decomposition of BC/PS/US process was superior to that of BC/PS or US/PS process. Both SO4- and HO participated in the degradation of BPA, but SO4- was predominant radical in the BC/PS/US process. A possible pathway of BPA degradation was proposed, and the BPA molecule was attacked by SO4- and degraded into five kinds of intermediate products through hydroxylation and demethylation processes. This study helps to comprehend the application of sludge biochar catalyst as a persulfate activator for the degradation of organic compounds under ultrasound irradiation, and provides a new strategy in wastewater treatment.
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Affiliation(s)
- Zeng-Hui Diao
- School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China; Department of Civil and Environment Engineering, Hong Kong Polytechnic University, Hong Kong.
| | - Fu-Xin Dong
- School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Liu Yan
- School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Zhi-Liang Chen
- Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil, South China Institute of Environmental Sciences, Guangzhou 510635, China
| | - Wei Qian
- School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | | | - Zai-Wang Zhang
- College of Biological and Environmental Engineering, Binzhou University, Binzhou 256600, China
| | - Tao Zhang
- Guangdong Environmental Monitoring Center, Guangzhou 510045, China
| | - Xue-Qin Tao
- School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Jian-Jun Du
- School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Dan Jiang
- Research Resources Center, South China Normal University, Guangzhou 510631, China
| | - Wei Chu
- Department of Civil and Environment Engineering, Hong Kong Polytechnic University, Hong Kong.
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Fu J, Liu N, Mei L, Liao L, Deyneko D, Wang J, Bai Y, Lv G. Synthesis of Ce-doped Mn 3Gd 7-xCe x(SiO 4) 6O 1.5 for the enhanced catalytic ozonation of tetracycline. Sci Rep 2019; 9:18734. [PMID: 31822737 PMCID: PMC6904768 DOI: 10.1038/s41598-019-55230-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 11/24/2019] [Indexed: 11/16/2022] Open
Abstract
A novel cerium doped compounds Mn3Gd7–xCex(SiO4)6O1.5 with an apatite structure was found and used to achieve high-efficiency degradation of tetracycline in aqueous solution. The catalysts were characterized by XRD, XPS, EDS and other techniques. The characteristic results indicated that the catalytic activity of the compound was improved due to the introduction of Ce in the structure, because Ce3+ which was stably present in the apatite structure can serve as an active site for the reaction, and in addition, there was a high presence between Ce4+ and Ce3+ on the surface of the catalyst. The redox potential and high oxygen storage capacity were also beneficial for the catalytic reaction. The results of free radical capture indicated that both superoxide radicals and hydroxyl radicals participated in the catalytic oxidation process and played an important role in the reaction. The decomposition of tetracycline followed the pseudo second-order reaction kinetics. In addition, the catalyst exhibited long-term stability and low metal leaching during the reaction, which indicated that the novel cerium-doped apatite structure material could be a promising wastewater treatment material.
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Affiliation(s)
- Jie Fu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China
| | - Ning Liu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China
| | - Lefu Mei
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China.
| | - Libing Liao
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China.
| | - Dina Deyneko
- Chemistry Department, Lomonosov Moscow State University, 119991, Moscow, Russia
| | - Jiayang Wang
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China
| | - Yaning Bai
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China
| | - Guocheng Lv
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China.
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34
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The electrochemical advanced oxidation processes coupling of oxidants for organic pollutants degradation: A mini-review. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2019.04.057] [Citation(s) in RCA: 159] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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35
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Muddemann T, Haupt D, Sievers M, Kunz U. Electrochemical Reactors for Wastewater Treatment. CHEMBIOENG REVIEWS 2019. [DOI: 10.1002/cben.201900021] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Thorben Muddemann
- Clausthal University of TechnologyInstitute of Chemical and Electrochemical Process Engineering Leibnizstrasse 17 38678 Clausthal-Zellerfeld Germany
| | - Dennis Haupt
- Clausthal University of TechnologyCUTEC Clausthal Research Center for Environmental Technologies Leibnizstrasse 23 38678 Clausthal Germany
| | - Michael Sievers
- Clausthal University of TechnologyCUTEC Clausthal Research Center for Environmental Technologies Leibnizstrasse 23 38678 Clausthal Germany
| | - Ulrich Kunz
- Clausthal University of TechnologyInstitute of Chemical and Electrochemical Process Engineering Leibnizstrasse 17 38678 Clausthal-Zellerfeld Germany
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36
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Chen W, Luo Y, Ran G, Li Q. An investigation of refractory organics in membrane bioreactor effluent following the treatment of landfill leachate by the O 3/H 2O 2 and MW/PS processes. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 97:1-9. [PMID: 31447015 DOI: 10.1016/j.wasman.2019.07.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 06/13/2019] [Accepted: 07/08/2019] [Indexed: 06/10/2023]
Abstract
In this study, refractory organics in a membrane bioreactor (MBR) effluent were investigated following the treatment of landfill leachate by the ozone combined hydrogen peroxide (O3/H2O2) and microwave-activated persulfate (MW/PS) processes. The treatment efficiency and the transformation characteristics of refractory organics and reactive oxygen species were determined. It was found that an acidic environment and an increase in the O3 dosage improved the organic removal efficiency in the O3/H2O2 process, and the use of H2O2 improved the treatment efficiency, while excessive H2O2 inhibited it. In the MW/PS process, an increase in the PS dosage and MW power greatly improved the treatment efficiency, while an alkaline environment inhibited it. Under the optimized reaction parameters, the O3/H2O2 and MW/PS processes effectively degraded refractory organics (i.e., humic acid and fulvic acid) into components with a smaller molecular weight and simpler structure. The humification, aromaticity, and conjugation of organics in wastewater were greatly reduced. Compared to the O3/H2O2 process, the MW/PS process had a better treatment effect on refractory organics, and there were more low molecular weight organics (<1 kDa) in the treated wastewater. Because O3 is the main selective oxidant in the O3/H2O2 process, a large amount of organic acids were accumulated. A large amount of hydroxyl radicals and sulfate radicals with strong oxidation ability were produced in the MW/PS process, and therefore the combined action of hydroxyl and sulfate radicals can efficiently decompose humus and intermediate organics. Overall, the MW/PS process was more effective in treating the MBR effluent than the O3/H2O2 process. The results of this study provide a reference for the selection of an advanced oxidation process to eliminate refractory organics in landfill leachate.
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Affiliation(s)
- Weiming Chen
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Yuanfeng Luo
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Gang Ran
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Qibin Li
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China.
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Wei K, Cao X, Gu W, Liang P, Huang X, Zhang X. Ni-Induced C-Al 2O 3-Framework ( NiCAF) Supported Core-Multishell Catalysts for Efficient Catalytic Ozonation: A Structure-to-Performance Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:6917-6926. [PMID: 31050416 DOI: 10.1021/acs.est.8b07132] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
During catalytic ozonation, Al2O3-supported catalysts usually have stable structures but relatively low surface activity, while carbon-supported catalysts are opposite. To encourage their synergisms, we designed a Ni-induced C-Al2O3-framework (NiCAF) and reinforced it with a Cu-Co bimetal to create an efficient catalyst (CuCo/NiCAF) with a core-multishell structure. The partial graphitization of carbon adjacent to Ni crystals formed a strong out-shell on the catalyst surface. The rate constant for total organic carbon removal of CuCo/NiCAF (0.172 ± 0.018 min-1) was 67% and 310% higher than that of Al2O3-supported catalysts and Al2O3 alone, respectively. The metals on CuCo/NiCAF contributed to surface-mediated reactions during catalytic ozonation, while the embedded carbon enhanced reactions within the solid-liquid boundary layer and in the bulk solution. Moreover, carbon embedment provided a 76% increase in ·OH-production efficiency and an 86% increase in organic-adsorption capacity compared to Al2O3-supported catalysts. During the long-term treatment of coal-gasification wastewater (∼5 m3 day-1), the pilot-scale demonstration of CuCo/NiCAF-catalyzed ozonation revealed a 120% increase in ozone-utilization efficiency (ΔCOD/ΔO3 = 2.12) compared to that of pure ozonation (0.96). These findings highlight catalysts supported on NiCAF as a facile and efficient approach to achieve both high catalytic activity and excellent structural stability, demonstrating that they are highly viable for practical applications.
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Affiliation(s)
- Kajia Wei
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , P. R. China
| | - Xiaoxin Cao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , P. R. China
| | - Wancong Gu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , P. R. China
| | - Peng Liang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , P. R. China
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , P. R. China
| | - Xiaoyuan Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , P. R. China
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38
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Wang B, Tian K, Xiong X, Ren H. Treatment of overhaul wastewater containing N-methyldiethanolamine (MDEA) through modified Fe-C microelectrolysis-configured ozonation: Investigation on process optimization and degradation mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2019; 369:655-664. [PMID: 30826558 DOI: 10.1016/j.jhazmat.2019.02.078] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 02/16/2019] [Accepted: 02/21/2019] [Indexed: 06/09/2023]
Abstract
In this study, the microelectrolysis system was applied to generate strong reductants, such as free hydrogen [H] and O∙, and thus removing N-Methyldiethanolamine (MDEA) in overhaul wastewater. Effects of initial influent pH, mass ratio of filings to wastewater, air aeration rate, and reaction temperature on the removal of MDEA were investigated intensively. Experimental results indicate that optimum removal rate of MDEA can be obtained at pH = 2, inlet air rate = 1 L min-1, mass ratio of filings to wastewater = 1:1 and temperature = 25 °C. About 96.0% Total Organic Carbon (TOC) in overhaul wastewater can be mineralized by ozonation-microelectrolysis-ozonation (OMIO) treatment process. By analyzing the effluent at various stages, it was established that microelectrolysis played a leading role in the destruction of MDEA. The degradation mechanism of MDEA has been clarified through detecting the degradation products with Gas Chromatography-Mass Spectrometer (GC-MS). Subsequently, ozone reacts with intermediate products generated by MDEA degration through OH· pathway under alkaline condition. In short, these results suggest that OMIO system should be proposed as a promising treatment process for the MDEA wastewater.
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Affiliation(s)
- Bing Wang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China; Sichuan Provincial Key Laboratory of Environmental Pollution Prevention on Oil and Gas Fields and Environmental Safety, Chengdu 610500, PR China.
| | - Kun Tian
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China
| | - Xingaoyuan Xiong
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China
| | - Hongyang Ren
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China
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39
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Nsubuga H, Basheer C, Jalilov A, Haider MB, Al-Saadi AA. Droplet flow-assisted heterogeneous electro-Fenton reactor for degradation of beta-blockers: response surface optimization, and mechanism elucidation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:14313-14327. [PMID: 30864040 DOI: 10.1007/s11356-019-04551-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
In this study, we report an effective degradation method for trace level beta-blockers (propranolol and acebutolol) in hospital wastewater using a new droplet flow-assisted heterogeneous electro-Fenton reactor (DFEF) system. Biogenic iron-carbon nanocomposites (RHS/C-x% Fe) as eco-friendly and low-cost heterogeneous Fenton catalysts were synthesized from rice husk via hydrolytic sol-gel routes. Here, we demonstrate the use of natural air as a nebulizing agent for fast and continuous catholyte air saturation and Fenton catalyst transfer to the cathode electrode. The effects of key operational parameters were evaluated and optimized using central composite design. Results clearly indicated that enhanced beta-blocker degradation was mainly dependent on the interactive effects of electrolysis time, current density, and catalyst dosage. Fast degradation efficiencies (≥ 99.9%) was recorded at neutral pH conditions. The decay followed pseudo-first-order kinetics with degradation rates of up to 2.72 × 10-2 and 2.54 × 10-2 min-1 for acebutolol and propranolol, respectively. The synergistic contribution of •OHbulk attributable to DFEF process and •OHadsorbed for anodic oxidation (AO) at the anode electrode significantly enhanced the degradation process. Compared to AO, the conventional flow-assisted electro-Fenton (FEF), and the batch electro-Fenton (BEF), DFEF degradation efficiency followed a decreasing order: DFEF ˃ FEF ˃ BEF˃ AO. This trend in performance was mainly due to the fast and continuous cathodic electro-generation of H2O2 and Fe2+ regeneration. Additionally, in order to elucidate degradation mechanism, we used a combination of DFEF approach with liquid chromatography-tandem mass spectrometry analysis. This approach demonstrates a simple, cleaner, and highly efficient degradation approach for trace level recalcitrant pollutants in a complex aquatic matrix, without the need for external chemical addition and pH adjustment.
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Affiliation(s)
- Hakimu Nsubuga
- Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
| | - Chanbasha Basheer
- Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.
| | - Almaz Jalilov
- Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
| | | | - Abdulaziz A Al-Saadi
- Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
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40
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Application of Fe-MOFs in advanced oxidation processes. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-03820-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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41
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Muddemann T, Haupt D, Sievers M, Kunz U. Elektrochemische Reaktoren für die Wasserbehandlung. CHEM-ING-TECH 2019. [DOI: 10.1002/cite.201800193] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Thorben Muddemann
- Technische Universität ClausthalInstitut für Chemische und Elektrochemische Verfahrenstechnik Leibnizstraße 17 38678 Clausthal-Zellerfeld Deutschland
| | - Dennis Haupt
- Technische Universität ClausthalClausthaler Umwelttechnik Forschungszentrum Leibnizstraße 23 38678 Clausthal-Zellerfeld Deutschland
| | - Michael Sievers
- Technische Universität ClausthalClausthaler Umwelttechnik Forschungszentrum Leibnizstraße 23 38678 Clausthal-Zellerfeld Deutschland
| | - Ulrich Kunz
- Technische Universität ClausthalInstitut für Chemische und Elektrochemische Verfahrenstechnik Leibnizstraße 17 38678 Clausthal-Zellerfeld Deutschland
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42
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Wang H, Wang C, Qi J, Yan Y, Zhang M, Yan X, Sun X, Wang L, Li J. Spiderweb-Like Fe-Co Prussian Blue Analogue Nanofibers as Efficient Catalyst for Bisphenol-A Degradation by Activating Peroxymonosulfate. NANOMATERIALS 2019; 9:nano9030402. [PMID: 30857337 PMCID: PMC6473942 DOI: 10.3390/nano9030402] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/04/2019] [Accepted: 03/07/2019] [Indexed: 01/22/2023]
Abstract
Prussian blue and its analogues (PBA) based nanomaterials have been widely applied to removing pollutants in the recent years. However, easy aggregation and poor recycling largely limit their practical applications. In this work, spiderweb-like Fe-Co Prussian blue analogue/polyacrylonitrile (FCPBA/PAN) nanofibers were prepared by electrospinning and applied to degrading bisphenol-A (BPA) by activating peroxymonosulfate (PMS). Detailed characterization demonstrated that a high loading of FCPBA (86% of FCPBA in FCPBA/PAN) was successfully fixed on the PAN nanofibers. 67% of BPA was removed within 240 min when 500 mg·L−1 PMS and 233 mg·L−1 FCPBA/PAN were introduced in 20 mg·L−1 BPA solution at initial pH of 2.8. Electron paramagnetic resonance (EPR) and radical inhibition experiments were performed to identify the possible degradation mechanism. For comparison, a low loading of FCPBA nanofibers (0.6FCPBA/PAN nanofibers, 43% of FCPBA in FCPBA/PAN) were also prepared and tested the catalytic performance. The results showed that the activity of FCPBA/PAN was much higher than 0.6FCPBA/PAN. Furthermore, a FCPBA/PAN packed column was made as a reactor to demonstrate the reusability and stability of FCPBA/PAN nanofibers, which also exhibited the bright future for the industrial application. This work makes it possible to fabricate efficient PBA nanocatalysts with excellent recyclability and promotes the application of PBA in industrial areas.
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Affiliation(s)
- Hongyu Wang
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Chaohai Wang
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Junwen Qi
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Yubo Yan
- Jiangsu Engineering Laboratory for Environment Functional Materials, Huaiyin Normal University, Huaian 223300, China.
| | - Ming Zhang
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Xin Yan
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Xiuyun Sun
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Lianjun Wang
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
| | - Jiansheng Li
- Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, Nanjing University of Science & Technology, Nanjing 210094, China.
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
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43
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Chen W, Gu Z, Wen P, Li Q. Degradation of refractory organic contaminants in membrane concentrates from landfill leachate by a combined coagulation-ozonation process. CHEMOSPHERE 2019; 217:411-422. [PMID: 30423520 DOI: 10.1016/j.chemosphere.2018.11.002] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 10/30/2018] [Accepted: 11/01/2018] [Indexed: 05/21/2023]
Abstract
Landfill leachate is a typical refractory wastewater for which research into rapid and efficient treatment methods has become very topical. In this study, a coagulation-ozonation process was developed to treat the concentrate arising from membrane treatment of landfill leachate. The effect of coagulant type and initial pH on treatment efficiencies was investigated. Results showed that many of organics were effectively removed in the coagulation process. Thereafter, ozone was applied to further treat the coagulation-resistant organic substances. Our results revealed that the degradation rate of these coagulation-resistant substances followed the trend (color number) CN > (light absorbance at 254 nm) UV254 > (chemical oxygen demand) COD, and the residual coagulation-resistant substances were oxidized rapidly in the ozone process. Ozone first destroyed the molecular structure of fulvic acid and the by-products generated, such as protein-like substances. In addition, the molecular weight, organic condensation degree, and concentration of benzene ring compounds were considerably decreased. Moreover, the macro molecular organics (i.e., humic acid and fulvic acid) within the size range 1-100 kDa were effectively degraded and partially transformed into bicarbonate. Overall, the combined coagulation-ozonation process reduced COD, UV254, and CN in the landfill leachate concentrate by 88.32%, 94.37%, and 98.83%, respectively, and thus the biodegradability of the treated leachate also was significantly improved. This excellent performance proved the feasibility of the combined coagulation-ozonation process for the removal of recalcitrant organic substances contained in landfill leachate concentrate, benefiting subsequent biological treatment.
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Affiliation(s)
- Weiming Chen
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China
| | - Zhepei Gu
- Key Laboratory of Special Wastewater Treatment of Sichuan Province Higher Education System, College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Peng Wen
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China
| | - Qibin Li
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China; Key Laboratory of Special Wastewater Treatment of Sichuan Province Higher Education System, College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
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44
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Yan J, Peng J, Lai L, Ji F, Zhang Y, Lai B, Chen Q, Yao G, Chen X, Song L. Activation CuFe 2O 4 by Hydroxylamine for Oxidation of Antibiotic Sulfamethoxazole. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:14302-14310. [PMID: 30424608 DOI: 10.1021/acs.est.8b03340] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A new potential oxidation process is provided by CuFe2O4/hydroxylamine (HA) system for degradation of antibiotics in water. The CuFe2O4/HA system can generate reactive oxygen species (ROS) for the degradation of sulfamethoxazole (SMX). The addition of radical scavengers, including benzoquinone (BQ) and catalase (CAT), inhibited the oxidation of SMX in CuFe2O4/HA system. Electron transfer in the CuFe2O4/HA system played a key function for the generation of ROS and the degradation of SMX. The main ROS, was the superoxide radical (O2•-) mainly generated from adsorbed oxygen (O2(A)), which came from the oxidation of the lattice oxygen (O2-(L)) in CuFe2O4. The CuFe2O4/HA system was effectively applicable for a broad pH range (approximately 5-10). In addition, the activation mechanism for CuFe2O4/HA system was studied with the target contaminant SMX. Finally, the degradation pathways of SMX were proposed under the optimal conditions in CuFe2O4/HA system.
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Affiliation(s)
- Jianfei Yan
- Department of Environmental Science and Engineering, College of Architecture and Environment , Sichuan University , Chengdu 610065 , P. R. China
| | - Jiali Peng
- Department of Environmental Science and Engineering, College of Architecture and Environment , Sichuan University , Chengdu 610065 , P. R. China
| | - Leiduo Lai
- Department of Environmental Science and Engineering, College of Architecture and Environment , Sichuan University , Chengdu 610065 , P. R. China
| | - Fangzhou Ji
- Department of Environmental Science and Engineering, College of Architecture and Environment , Sichuan University , Chengdu 610065 , P. R. China
| | - Yunhong Zhang
- Biogas Institute of Ministry of Agriculture , Chengdu 610041 , P. R. China
| | - Bo Lai
- Department of Environmental Science and Engineering, College of Architecture and Environment , Sichuan University , Chengdu 610065 , P. R. China
- Sino-German Centre for Water and Health Research , Sichuan University , Chengdu 610065 , P. R. China
- National Engineering Research Center for Flue Gas Desulfurization , Sichuan University , Chengdu 610065 , P. R. China
- Institute of Environmental Engineering , RWTH Aachen University , Aachen 52056, Germany
| | - Qixuan Chen
- Department of Environmental Science and Engineering, College of Architecture and Environment , Sichuan University , Chengdu 610065 , P. R. China
| | - Gang Yao
- Sino-German Centre for Water and Health Research , Sichuan University , Chengdu 610065 , P. R. China
- Institute of Environmental Engineering , RWTH Aachen University , Aachen 52056, Germany
| | - Xi Chen
- SCIEX Analytical Instrument Trading Co. , Shanghai , 200335 , P. R. China
| | - Liping Song
- SCIEX Analytical Instrument Trading Co. , Shanghai , 200335 , P. R. China
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Peng J, Yan J, Chen Q, Jiang X, Yao G, Lai B. Natural mackinawite catalytic ozonation for N, N-dimethylacetamide (DMAC) degradation in aqueous solution: Kinetic, performance, biotoxicity and mechanism. CHEMOSPHERE 2018; 210:831-842. [PMID: 30048935 DOI: 10.1016/j.chemosphere.2018.07.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 06/17/2018] [Accepted: 07/13/2018] [Indexed: 06/08/2023]
Abstract
To enhance the degradation of N, N-dimethylacetamide (DMAC) in aqueous solution, the natural mackinawite (NM) is introduced for catalytic ozonation in this study as it is an environmentally friendly catalyst with low cost and easy availability. The properties of the NM were initially characterized via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Then, impact factors including NM dosage, ozone gas concentration and initial pH were investigated and the optimal conditions (i.e., NM dosage = 3.5 g/L, ozone gas concentration = 300 L/min, initial pH = 6.8) were obtained in NM/O3 process. Besides, the superiority of the NM/O3 process was confirmed by the experiments that the degradation efficiency of DMAC in the NM/O3 process (i.e., 95.4%) was much higher than that in the zero-valent iron (ZVI)/O3 process (i.e., 46.1%) and the synthetic FeS/O3 process (i.e., 68.6%). Furthermore, the intermediate and possible degradation pathway of DMAC were proposed, and the biological toxicity of the intermediate was subsequently evaluated by the activated sludge. Finally, the mechanism of the NM/O3 process was proposed in this study based on control experiment and radical scavenging experiment. The extraordinary efficiency for DMAC degradation was found to be mainly caused by HO• of the reactive oxygen species (ROS) (i.e., HO•, O2•- and H2O2) generated in the NM/O3 process. Therefore, this study confirmed that NM was a high efficient catalyst for degradation the toxic and refractory pollutants in catalytic ozonation system.
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Affiliation(s)
- Jiali Peng
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Jianfei Yan
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
| | - Qixuan Chen
- Haitian Water Group Co., Ltd, Chengdu 610065, China
| | - Xia Jiang
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Gang Yao
- Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China; Institute of Environmental Engineering, RWTH Aachen University, Germany
| | - Bo Lai
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China.
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