1
|
Zhao Y, Gao J, Zhou X, Li Z, Zhao C, Jia X, Ji M. Bio-immobilization and recovery of chromium using a denitrifying biofilm system: Identification of reaction zone, binding forms and end products. J Environ Sci (China) 2023; 126:70-80. [PMID: 36503795 DOI: 10.1016/j.jes.2022.03.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/29/2022] [Accepted: 03/29/2022] [Indexed: 06/17/2023]
Abstract
Chromium is an important resource in strategic metals. Different from most studies focusing on the bio-reduction of hexavalent chromium [Cr(VI)], this study aims to achieve the immobilization and recovery of chromium using a sequencing batch biofilm reactor. Results showed that Cr(VI) removal efficiency remained more than 99%, and 97% of reduced Cr(III) was immobilized in the biofilm. Immobilization zone, chromium forms and extracellular polymeric substances composition changes were combined to reveal the mechanism of Cr(VI) reduction and immobilization. The chromium distribution in biofilm demonstrated that intercellular layer was the main active zone with an immobilization amount of 891.70±126.32 mg/g-VSS. The reduced products analysis confirmed that trivalent chromium [Cr(III)] chelated with carboxyl, amino and other functional groups and immobilized in the form of organic Cr(III). The digestion method realized a chromium recovery efficiency of 74.59%. This study provides an alternative method for the bioremediation and resources recovery in chromium polluted wastewater.
Collapse
Affiliation(s)
- Yingxin Zhao
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Junzhi Gao
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Xu Zhou
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Zhouran Li
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Cailian Zhao
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Xulong Jia
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Min Ji
- School of environment Science and Engineering, Tianjin University, Tianjin 300350, China
| |
Collapse
|
2
|
Jin X, Wu Y, Lin Z, Liang D, Wang F, Zheng X, Liu H, Lv W, Liu G. Plasmonic Ag nanoparticles decorated copper-phenylacetylide polymer for visible-light-driven photocatalytic reduction of Cr(VI) and degradation of PPCPs: Performance, kinetics, and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2022; 425:127599. [PMID: 34895929 DOI: 10.1016/j.jhazmat.2021.127599] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 10/22/2021] [Accepted: 10/22/2021] [Indexed: 06/14/2023]
Abstract
The development of efficacious photocatalysts for the elimination of contaminants in water remains a challenge. Herein, a promising Ag nanoparticles-decorated copper-phenylacetylide (Ag/PhC2Cu) plasmonic photocatalyst was fabricated for the reduction of hexavalent chromium (Cr(VI)) and degradation of pharmaceutical and personal care products (PPCPs). Typically, the optimized 5Ag/PhC2Cu could rapidly reduce Cr(VI) (98.1% within 12 min), and degrade norfloxacin (NOR) (100% within 40 min) with a 56.2% mineralization rate under visible light. The superior photocatalytic activity of Ag/PhC2Cu was attributed to the synergistic effects of the highly reducing photoinduced electrons conferred by the PhC2Cu (-1.98 eV), and Ag nanoparticles in promoting photocarrier separation and enhancing solar-energy-conversion efficiencies. Subsequently, the photocatalytic reaction mechanism of Ag/PhC2Cu was investigated. It was found that e- and O2•- were the main reactive species for Cr(VI) reduction, while O2•- and h+ were primarily responsible for the degradation of NOR. Of note, the Ag/PhC2Cu system could effectively generate H2O2 and partially decomposed it to •OH, which might be involved in NOR mineralization. This study not only demonstrates a highly active photocatalytic system for the remediation of environmental pollution and sustainable solar-to-chemical energy conversion, but contributes to the future exploration of multifunctional plasmonic photocatalysts.
Collapse
Affiliation(s)
- Xiaoyu Jin
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Yuliang Wu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
| | - Zili Lin
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Danluo Liang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Fengliang Wang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640 China
| | - Xiaoshan Zheng
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Haijin Liu
- Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China
| | - Wenying Lv
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Guoguang Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| |
Collapse
|
3
|
Zhu W, Van Tendeloo M, Alloul A, Vlaeminck SE. Towards mainstream partial nitritation/anammox in four seasons: Feasibility of bioaugmentation with stored summer sludge for winter anammox assistance. BIORESOURCE TECHNOLOGY 2022; 347:126619. [PMID: 34958904 DOI: 10.1016/j.biortech.2021.126619] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 12/19/2021] [Accepted: 12/20/2021] [Indexed: 06/14/2023]
Abstract
The strong effect of low temperatures on anammox challenges its mainstream application over the winter in temperate climates. Winter bioaugmentation with stored summer surplus sludge is a potential solution to guarantee sufficient nitrogen removal in winter. Firstly, the systems for which nitrogen removal deteriorated by the temperature decrease (25 °C → 20 °C) could be fully restored bioaugmenting with granules resp. flocs stored for 6 months at 118 resp. 220% of the initial biomass levels. Secondly, the reactivation of these stored sludges was tested in lower temperature systems (15.3 ± 0.4/10.4 ± 0.4 °C). Compared to the activity before storage, between 56% and 41% of the activity of granules was restored within one month, and 41%-32% for flocs. Additionally, 85-87% of granules and 50-53% of flocs were retained in the systems. After reactivation (15.3 ± 0.4/10.4 ± 0.4 °C), a more specialized community was formed (diversity decreased) with Candidatus Brocadia still dominant in terms of relative abundance. Capital and operating expenditures (CAPEX, OPEX) were negligible, representing only 0.19-0.36% of sewage treatment costs.
Collapse
Affiliation(s)
- Weiqiang Zhu
- Research Group of Sustainable Energy, Air and Water Technology, Department of Bioscience Engineering, University of Antwerp, Antwerpen 2020, Belgium
| | - Michiel Van Tendeloo
- Research Group of Sustainable Energy, Air and Water Technology, Department of Bioscience Engineering, University of Antwerp, Antwerpen 2020, Belgium
| | - Abbas Alloul
- Research Group of Sustainable Energy, Air and Water Technology, Department of Bioscience Engineering, University of Antwerp, Antwerpen 2020, Belgium
| | - Siegfried E Vlaeminck
- Research Group of Sustainable Energy, Air and Water Technology, Department of Bioscience Engineering, University of Antwerp, Antwerpen 2020, Belgium.
| |
Collapse
|
4
|
Shangguan Y, Zheng R, Ge Q, Feng X, Wang R, Zhou Y, Luo S, Duan L, Lin J, Chen H. Interfacial engineering of CuFeS 2 quantum dots via platinum decoration with enhanced Cr(VI) reduction dynamics under UV-Vis-NIR radiation. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126701. [PMID: 34339984 DOI: 10.1016/j.jhazmat.2021.126701] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 07/13/2021] [Accepted: 07/18/2021] [Indexed: 06/13/2023]
Abstract
Configuring reactive and stable catalytic interfaces is crucial to design efficient photocatalysts for Cr(VI) reduction. Herein, via the platinum decoration approach based on interfacial engineering, we developed an effective catalytic interface within novel semiconducting chalcopyrite quantum dots (Pt/CuFeS2 QDs). Benefiting from the catalytic merits of the Pt modulated interfacial structure and electronic structure, Pt/CuFeS2 QDs show a broader light absorption capability extending to near-infrared radiation (NIR) range with superior carriers separation performance and faster charge transfer efficiency, which delivers a three-folder faster photocatalytic Cr(VI) reduction efficiency comparing to the original CuFeS2 QDs. Density functional theory (DFT) calculations unravel that Pt atoms prefer to be anchored with the surface S atoms to form a stable interfacial structure with faster electron transfer and Cr(VI) reduction dynamics. This work demonstrates that platinum decoration based on interfacial engineering is an effective strategy to simultaneously modulate the band structure and accelerate the interfacial reaction dynamics for semiconductor photocatalysts, which paves the way for designing highly efficient photocatalysts for light-driven environmental and energy engineering applications.
Collapse
Affiliation(s)
- Yangzi Shangguan
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Renji Zheng
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qiuyue Ge
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Xuezhen Feng
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Ranhao Wang
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuanhao Zhou
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Siyuan Luo
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Lele Duan
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jia Lin
- Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Hong Chen
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
| |
Collapse
|
5
|
Oseghe EO, Idris AO, Feleni U, Mamba BB, Msagati TAM. A review on water treatment technologies for the management of oxoanions: prospects and challenges. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:61979-61997. [PMID: 34561799 DOI: 10.1007/s11356-021-16302-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
Oxoanions are a class of contaminants that are easily released into the aquatic systems either through natural or anthropogenic activities. Depending on their oxidation states, they are highly mobile, resulting in the contamination of underground water. Above the permissible level in groundwater, they pose as threats to mammals when the contaminated water is consumed. Some of the health challenges caused are cancer, neurological, cardiac, gastrointestinal, and skin disorders. Several treatment technologies have been adopted over the years for the management of these oxoanions present in the aquatic systems. However interesting these treatment technologies might be, they also have their limitations such as cost-effectiveness, the complexity of the process, and generation of secondary pollutants. This work focused on some of the water treatment technologies applied for the removal of oxoanions. Some of the advantages and disadvantages of these treatment technologies are also highlighted. Amongst all the treatment technologies, adsorption is the most applied method for the removal of oxoanions. However, photocatalysis has a higher prospect since it is non-selective and secondary pollutants are not generated after the treatment process. Also, photocatalysis can simultaneously reduce and oxidise oxoanions as well as organic pollutants respectively.
Collapse
Affiliation(s)
- Ekemena Oghenovoh Oseghe
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg, 1709, South Africa.
| | - Azeez Olayiwola Idris
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg, 1709, South Africa
| | - Usisipho Feleni
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg, 1709, South Africa
| | - Bhekie Brilliance Mamba
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg, 1709, South Africa
| | - Titus Alfred Makudali Msagati
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg, 1709, South Africa
| |
Collapse
|
6
|
Diao ZH, Yan L, Dong FX, Chen ZL, Guo PR, Qian W, Zhang WX, Liang JY, Huang ST, Chu W. Ultrasound-assisted catalytic reduction of Cr(VI) by an acid mine drainage based nZVI coupling with FeS 2 system from aqueous solutions: Performance and mechanism. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 278:111518. [PMID: 33113397 DOI: 10.1016/j.jenvman.2020.111518] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 09/30/2020] [Accepted: 10/12/2020] [Indexed: 05/22/2023]
Abstract
Nowadays, nanoscale zero valent iron (nZVI) has been extensively applied for the decontamination of various pollutants, but passivation of nZVI severely affects its reactivity in use. In this study, ultrasound (US)-assisted catalytic reduction of Cr(VI) by an acid mine drainage based nZVI (AMD-nZVI) coupling with FeS2 system was systematically examined. Results show that the presence of FeS2 and US induced a synergistic enhancement of Cr(VI) removal by AMD-nZVI. Nearly 98% of Cr(VI) removal was achieved by AMD-nZVI/FeS2/US process within 60 min under optimal reaction conditions. Several coexisting substances with lower concentration including Pb(II), Ni(II), bisphenol A (BPA) and 2,4-diclorophenol (2,4-DCP) could be effectively removed in simultaneous manner with Cr(VI) removal. The inhibitory order of water matrix species on Cr(VI) removal was NO3- > PO43- > HCO3- > Ca2+ > Mg2+ > Cl-, and a serious suppression effect was induced by humic acid (HA). Addition of ethylene diamine tetra-acetic acid (EDTA) and citric acid (CA) could enhance Cr(VI) removal rate. An enhanced reaction mechanism was proposed, which involved the regeneration of more Fe2+ and H+ by AMD-nZVI/FeS2/US process, leading to the reduction of Cr(VI) by AMD-nZVI and FeS2 into Cr(III) species inculding Cr2O3 and Cr(OH)3. This study well demonstrates that AMD-nZVI/FeS2/US process is considered as a potential candidate for the remediation of Cr(VI) in real wasterwater.
Collapse
Affiliation(s)
- Zeng-Hui Diao
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China; Hong Kong Polytechnic University, Hong Kong; Engineering and Technology Research Center for Agricultural Land Pollution Prevention and Control of Guangdong Higher Education Institutes, Guangzhou, 510225, China.
| | - Liu Yan
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Fu-Xin Dong
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Zhi-Liang Chen
- South China Institute of Environmental Sciences, Guangzhou, 510635, China
| | - Peng-Ran Guo
- Guangdong Engineering Technology Research Center of On-line Monitoring of Water Environmental Pollution, Guangdong Institute of Analysis, Guangzhou, 510070, China
| | - Wei Qian
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Wen-Xuan Zhang
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Jing-Yi Liang
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Shi-Ting Huang
- Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Wei Chu
- Hong Kong Polytechnic University, Hong Kong.
| |
Collapse
|
7
|
Li J, Li M, Wang S, Yang X, Liu F, Liu X. Key role of pore size in Cr(VI) removal by the composites of 3-dimentional mesoporous silica nanospheres wrapped with polyaniline. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 729:139009. [PMID: 32380329 DOI: 10.1016/j.scitotenv.2020.139009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 04/23/2020] [Accepted: 04/24/2020] [Indexed: 06/11/2023]
Abstract
A series of three-dimensional silica nanospheres with different pore sizes was synthesized in a biphasic oil-water system and their pore dimensions were adjusted by controlling the composition of the oil phase. The silica nanospheres were then wrapped with polyaniline, characterized, and the obtained silica nanosphere-polyaniline composites were used for the removal of Cr(VI). Polyaniline was generated by the polymerization of aniline. The mesoporous silica has sufficient dendritic pore channels and offers a large contact surface for the polymerization of aniline. Furthermore, the mesoporous silica nanospheres are beneficial for dispersing polyaniline and transferring aqueous Cr(VI). The silica nanosphere-polyaniline composite with the largest pore size (~15.4 nm) showed the best Cr(VI) removal performance. We also investigated the kinetic characteristics and the result could be fitted to the pseudo-second-order kinetic model. Moreover, we demonstrate that the composites maintain a high Cr(VI) removal efficiency compared to other anions (H2PO4-, SO42-, etc.), indicating their good prospect in practical wastewater treatment. Remarkably, the silica-polyaniline composites showed enhanced Cr(VI) removal efficiency under UV-irradiation. The effects of electrons and H+ on Cr(VI) reduction are also discussed based on the results of UV-vis and X-ray photoelectron spectroscopic studies and bath experiments (influence of pH on adsorption capacity). Mechanistic studies indicate that the Cr(VI) removal occurs in two stages-adsorption and reduction. The negatively charged aqueous Cr(VI) species first interact with the positively charged protonated amine groups via electrostatic attraction, and are then further reduced to less-toxic Cr(III) by the electrons and H+ donated by the amine groups on polyaniline.
Collapse
Affiliation(s)
- Jiacheng Li
- School of Environment, Tsinghua University, Hai Dian Distract, Beijing 100084, China
| | - Miao Li
- School of Environment, Tsinghua University, Hai Dian Distract, Beijing 100084, China.
| | - Sai Wang
- School of Environment, Tsinghua University, Hai Dian Distract, Beijing 100084, China
| | - Xu Yang
- School of Environment, Tsinghua University, Hai Dian Distract, Beijing 100084, China
| | - Fang Liu
- School of Environment, Tsinghua University, Hai Dian Distract, Beijing 100084, China
| | - Xiang Liu
- School of Environment, Tsinghua University, Hai Dian Distract, Beijing 100084, China
| |
Collapse
|
8
|
Shrivastava KC, Pandey SP, Kumar SA, Pandey AK, Debnath AK, Srivastava AP, Patkare GR, Abraham GJ. Remediation of chromium(VI) ions as chromium oxide xerogel via gamma-radiolysis of aqueous waste discharge. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
9
|
Chen Y, Chen Q, Zhao H, Dang J, Jin R, Zhao W, Li Y. Wheat Straws and Corn Straws as Adsorbents for the Removal of Cr(VI) and Cr(III) from Aqueous Solution: Kinetics, Isotherm, and Mechanism. ACS OMEGA 2020; 5:6003-6009. [PMID: 32226881 PMCID: PMC7098018 DOI: 10.1021/acsomega.9b04356] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 03/02/2020] [Indexed: 05/30/2023]
Abstract
In this paper, the adsorption properties of wheat straw (WS) and corn straw (CS) for Cr(VI) and Cr(III) in solution were studied. The effects of adsorption time, pH of the solution, temperature, and initial concentration of metal ions on adsorption capacity were investigated. The adsorption mechanism was discussed. The results showed that the adsorption isotherms of WS and CS for Cr(VI) and Cr(III) satisfied the Langmuir equation. By fitting the Langmuir equation, the saturated adsorption capacity of WS for Cr(VI) and Cr(III) can reach 125.6 and 68.9 mg g-1, and that of CS for Cr(VI) and Cr(III) can reach 87.4 and 62.3 mg g-1 , respectively. The adsorption kinetics conformed to the pseudo-second-order kinetic equation. The effect of temperature on the adsorption capacity was not significant. Physical diffusion and chemical adsorption coexist in the process of adsorption of metal ions by straws, and chemical adsorption is dominant, and the effect of physical diffusion on the chemical adsorption rate can be neglected. It can be seen from the experimental results that the treatment of chromium-containing wastewater by using cheap and easily available wheat straw and corn straw had a remarkable effect. The adsorbed straw could be completely desorbed and had excellent recyclability, indicating that the straws are ideal adsorbents.
Collapse
|
10
|
Shi J, Zhang B, Qiu R, Lai C, Jiang Y, He C, Guo J. Microbial Chromate Reduction Coupled to Anaerobic Oxidation of Elemental Sulfur or Zerovalent Iron. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:3198-3207. [PMID: 30776217 DOI: 10.1021/acs.est.8b05053] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Chromate (Cr(VI)), as one of ubiquitous contaminants in groundwater, has posed a major threat to public health and ecological environment. Although various electron donors (e.g., organic carbon, hydrogen, and methane) have been proposed to drive chromate removal from contaminated water, little is known for microbial chromate reduction coupled to elemental sulfur (S(0)) or zerovalent iron (Fe(0)) oxidation. This study demonstrated chromate could be biologically reduced by using S(0) or Fe(0) as inorganic electron donor. After 60-day cultivation, the sludge achieved a high Cr(VI) removal efficiency of 92.9 ± 1.1% and 98.1 ± 1.2% in two independent systems with S(0) or Fe(0) as the sole electron donor, respectively. The deposited Cr(III) was identified as the main reduction product based on X-ray photoelectron spectroscopy. High-throughput 16S rRNA gene sequencing indicated that Cr(VI) reduction coupled to S(0) or Fe(0) oxidation was mediated synergically by a microbial consortia. In such the consortia, S(0)- or Fe(0)-oxidizing bacteria (e.g., Thiobacillus or Ferrovibrio) could generate volatile fatty acids as metabolites, which were further utilized by chromate-reducing bacteria (e.g., Geobacter or Desulfovibrio) to reduce chromate. Our findings advance our understanding on microbial chromate reduction supported by solid electron donors and also offer a promising process for groundwater remediation.
Collapse
Affiliation(s)
- Jiaxin Shi
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution , China University of Geosciences (Beijing) , Beijing 100083 , P. R. China
| | - Baogang Zhang
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution , China University of Geosciences (Beijing) , Beijing 100083 , P. R. China
| | - Rui Qiu
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution , China University of Geosciences (Beijing) , Beijing 100083 , P. R. China
| | - Chunyu Lai
- Advanced Water Management Centre , The University of Queensland , St Lucia , Queensland 4072 , Australia
| | - Yufeng Jiang
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution , China University of Geosciences (Beijing) , Beijing 100083 , P. R. China
| | - Chao He
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution , China University of Geosciences (Beijing) , Beijing 100083 , P. R. China
| | - Jianhua Guo
- Advanced Water Management Centre , The University of Queensland , St Lucia , Queensland 4072 , Australia
| |
Collapse
|
11
|
Panousi E, Mamais D, Noutsopoulos C, Mpertoli K, Kantzavelou C, Nyktari E, Kavallari I, Nasioka M, Kaldis A. Biological groundwater treatment for hexavalent chromium removal at low chromium concentrations under anoxic conditions. ENVIRONMENTAL TECHNOLOGY 2019; 40:365-373. [PMID: 29032730 DOI: 10.1080/09593330.2017.1393013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Accepted: 10/02/2017] [Indexed: 06/07/2023]
Abstract
The objective of this work is to evaluate biological groundwater treatment systems that will achieve hexavalent chromium removal from groundwater at hexavalent chromium (Cr(VI)) groundwater concentrations in the 0-200 μg/L range under anoxic conditions. The effect of type of organic substrate added as feed to the groundwater treatment system (milk, sugar and cheese whey), the effect of different concentrations of chemical oxygen demand added in the feed (100, 150 and 200 mg/L) and the effect of different hydraulic residence time (1.7, 0.9 and 0.7 d) on process performance were evaluated through the operation of a series of sequential batch reactors under anoxic conditions. Biomass receiving Cr(VI) contaminated groundwater with a low nitrates content exhibited similar Cr(VI) removal efficiency under reductive conditions, with biomass receiving Cr(VI) contaminated groundwater with a high nitrates content. The concentration of organic substrate was crucial for the microbial reduction of Cr(VI). The different hydraulic residence time of the reactors and the different types of organic substrates added did not affect the efficiency of hexavalent chromium removal which was complete. This study demonstrates that biological systems operating under reductive conditions can efficiently treat groundwater containing low or high nitrates concentration and can provide complete hexavalent chromium removal at initial Cr(VI) concentrations of 200 μg/L.
Collapse
Affiliation(s)
- E Panousi
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - D Mamais
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - C Noutsopoulos
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - K Mpertoli
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - C Kantzavelou
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - E Nyktari
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - I Kavallari
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - M Nasioka
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| | - A Kaldis
- a Department of Water Resources and Environmental Engineering , School of Civil Engineering, National Technical University of Athens , Athens , Greece
| |
Collapse
|
12
|
Ferro Orozco AM, Contreras EM, Zaritzky NE. Interdependence between the aerobic degradation of BPA and readily biodegradable substrates by activated sludge in semi-continuous reactors. Biodegradation 2018; 29:579-592. [PMID: 30242540 DOI: 10.1007/s10532-018-9854-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 09/17/2018] [Indexed: 11/29/2022]
Abstract
The objective of the present work was to analyze the interrelationship between the aerobic degradation of BPA and readily biodegradable substrates by activated sludge (AS) in semi-continuous reactors (SCRs). AS were obtained from three SCRs fed with glucose, acetate or peptone. AS from these reactors were used as inocula for three SCRs that were fed with each biogenic substrate, and for three SCRs that were fed with the biogenic substrate and BPA. In all cases, dissolved organic carbon (DOC), BPA, total suspended solids (TSS) and respirometric measurements were performed. Although BPA could be removed in the presence of all the tested substrates, AS grown on acetate exhibited the longest acclimation to BPA. Reactors fed with peptone attained the lowest TSS concentration; however, these AS had the highest specific BPA degradation rate. Specific DOC removal rates and respirometric measurements demonstrated that the presence of BPA had a negligible effect on the removal of the tested substrates. A mathematical model was developed to represent the evolution of TSS and DOC in the SCRs as a function of the operation cycle. Results suggest that the main effect of BPA on AS was to increase the generation of microbial soluble products. This work helps to understand the relationship between the biodegradation of BPA and readily biodegradable substrates.
Collapse
Affiliation(s)
- A M Ferro Orozco
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) CCT Mar del Plata CONICET - Fac. de Ing, UNMdP, J.B. Justo 4302, B7608FDQ, Mar Del Plata, Argentina.
| | - E M Contreras
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) CCT Mar del Plata CONICET - Fac. de Ing, UNMdP, J.B. Justo 4302, B7608FDQ, Mar Del Plata, Argentina
| | - N E Zaritzky
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA) CCT La Plata CONICET - Fac. de Cs. Exactas, UNLP, 47 y 116, B1900AJJ, La Plata, Argentina.,Fac. de Ingeniería, UNLP, 47 y 1, B1900AJJ, La Plata, Argentina
| |
Collapse
|
13
|
Simultaneous Treatment of Agro-Industrial and Industrial Wastewaters: Case Studies of Cr(VI)/Second Cheese Whey and Cr(VI)/Winery Effluents. WATER 2018. [DOI: 10.3390/w10040382] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
14
|
Garza-González MT, Ramírez-Vázquez JE, García-Hernández MDLÁ, Cantú-Cárdenas ME, Liñan-Montes A, Villarreal-Chiu JF. Reduction of chromium (VI) from aqueous solution by biomass of Cladosporium cladosporioides. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:2494-2502. [PMID: 29144307 DOI: 10.2166/wst.2017.427] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The capacity of Cladosporium cladosporioides biomass for removal of Cr(VI) in aqueous solutions was evaluated. A 2 × 2 factorial experiment design was used to study the effects of pH and biomass doses. Lower pH values and larger biomass doses increased the capacity of C. cladosporioides biomass for removal of Cr(VI), reaching a reduction capacity of 492.85 mg g-1, a significantly higher value compared to other biomass reported. Cr(VI) removal kinetic rates followed a pseudo-second order model, like other fungal biomass reported previously. The apparent adsorption process was described well by the Freundlich isothermal model. However, determination of total chromium indicated that adsorption of Cr(VI) was followed by a redox reaction that released proportional quantities of Cr(III) into the experimental supernatant, suggesting a parallel adsorption-reduction process. Comparison of Fourier transform infrared spectroscopy spectra of C. cladosporioides biomass before and after the reduction process demonstrated the involvement of positively charged amino groups in the Cr(VI) adsorption-reduction process.
Collapse
Affiliation(s)
- María Teresa Garza-González
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorio de Biotecnología. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, México E-mail:
| | - Jonathan Eduardo Ramírez-Vázquez
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorio de Biotecnología. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, México E-mail:
| | - María de Los Ángeles García-Hernández
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorio de Biotecnología. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, México E-mail:
| | - María Elena Cantú-Cárdenas
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorio de Biotecnología. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, México E-mail:
| | - Adriana Liñan-Montes
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorios de Instrumentación Analítica. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, México
| | - Juan Francisco Villarreal-Chiu
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorio de Biotecnología. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza 66455, Nuevo León, México E-mail:
| |
Collapse
|
15
|
Chen G, Feng J, Wang W, Yin Y, Liu H. Photocatalytic removal of hexavalent chromium by newly designed and highly reductive TiO 2 nanocrystals. WATER RESEARCH 2017; 108:383-390. [PMID: 27838021 DOI: 10.1016/j.watres.2016.11.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 10/31/2016] [Accepted: 11/03/2016] [Indexed: 06/06/2023]
Abstract
Hexavalent chromium Cr(VI), a highly toxic oxyanion, widely occurs in drinking water supplies. This study designed and synthesized a new type of highly reductive TiO2 nanocrystals for photochemical Cr(VI) removal, via the thermal hydrolysis of TiCl4 in the presence of diethylene glycol (DEG). Surface analyses and hydroxyl radical measurements suggested that DEG was chemically bonded on TiO2 surface that resulted in an internal hole-scavenging effect and a high electron-releasing capacity, making it advantageous to conventional TiO2 materials. Upon UV irradiation, the synthesized TiO2 photocatalyst exhibited fast Cr(VI) reduction kinetics in diverse water chemical conditions. Fast elimination of Cr(VI) was achieved on a time scale of seconds in drinking water matrices. The removal of Cr(VI) by reductive TiO2 exhibited a three-stage kinetic behavior: an initial fast-reaction phase, a lag phase resulting from surface precipitation of Cr(OH)3(s), and a final reaction phase due to surface regeneration from oxidation-reduction induced ripening process. The lag phase disappeared in acidic conditions that prevented the formation of Cr(OH)3(s). The catalyst exhibited extremely high electron-releasing capacity that can be reused for multiple cycles of Cr(VI) removal in drinking water treatment.
Collapse
Affiliation(s)
- Gongde Chen
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA, 92521, USA; UCR Center for Catalysis, University of California, Riverside, CA, 92521, USA
| | - Ji Feng
- UCR Center for Catalysis, University of California, Riverside, CA, 92521, USA; Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Wenshou Wang
- UCR Center for Catalysis, University of California, Riverside, CA, 92521, USA; Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Yadong Yin
- UCR Center for Catalysis, University of California, Riverside, CA, 92521, USA; Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Haizhou Liu
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA, 92521, USA; UCR Center for Catalysis, University of California, Riverside, CA, 92521, USA.
| |
Collapse
|
16
|
Mo X, Yang ZH, Xu HY, Zeng GM, Huang J, Yang X, Song PP, Wang LK. Combination of cathodic reduction with adsorption for accelerated removal of Cr(VI) through reticulated vitreous carbon electrodes modified with sulfuric acid-glycine co-doped polyaniline. JOURNAL OF HAZARDOUS MATERIALS 2015; 286:493-502. [PMID: 25603298 DOI: 10.1016/j.jhazmat.2015.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Revised: 11/25/2014] [Accepted: 01/01/2015] [Indexed: 06/04/2023]
Abstract
Improving the reduction kinetics is crucial in the electroreduction process of Cr(VI). In this study, we developed a novel adsorption-electroreduction system for accelerated removal of Cr(VI) by employing reticulated vitreous carbon electrode modified with sulfuric acid-glycine co-doped polyaniline (RVC/PANI-SA-GLY). Firstly, response surface methodology confirmed the optimum polymerization condition of co-doped polyaniline for modifying electrodes (Aniline, sulfuric acid and glycine, respectively, of 0.2 mol/L, 0.85 mol/L, 0.93 mol/L) when untraditional dopant glycine was added. Subsequently, RVC/PANI-SA-GLY showed higher Cr(VI) removal percentages in electroreduction experiments over RVC electrode modified with sulfuric acid doped polyaniline (RVC/PANI-SA) and bare RVC electrode. In contrast to RVC/PANI-SA, the improvement by RVC/PANI-SA-GLY was more significant and especially obvious at more negative potential, lower initial Cr(VI) concentration, relatively less acidic solution and higher current densities, best achieving 7.84% higher removal efficiency with entire Cr(VI) eliminated after 900 s. Current efficiencies were likewise enhanced by RVC/PANI-SA-GLY under quite negative potentials. Fourier transform infrared (FTIR) and energy dispersive spectrometer (EDS) analysis revealed a possible adsorption-reduction mechanism of RVC/PANI-SA-GLY, which greatly contributed to the faster reduction kinetics and was probably relative to the absorption between protonated amine groups of glycine and HCrO4(-). Eventually, the stability of RVC/PANI-SA-GLY was proven relatively satisfactory.
Collapse
Affiliation(s)
- Xi Mo
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhao-hui Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Hai-yin Xu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Guang-ming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Jing Huang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xia Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Pei-pei Song
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Li-ke Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| |
Collapse
|
17
|
Gu Y, Xu W, Liu Y, Zeng G, Huang J, Tan X, Jian H, Hu X, Li F, Wang D. Mechanism of Cr(VI) reduction by Aspergillus niger: enzymatic characteristic, oxidative stress response, and reduction product. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:6271-6279. [PMID: 25408081 DOI: 10.1007/s11356-014-3856-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 11/10/2014] [Indexed: 06/04/2023]
Abstract
Bioremediation of hexavalent chromium by Aspergillus niger was attributed to the reduction product (trivalent chromium) that could be removed in precipitation and immobilized inside the fungal cells and on the surface of mycelium. The site location of reduction was conducted with assays of the permeabilized cells, cell-free extracts, and cell debris, which confirmed that the chromate reductase was mainly located in the soluble fraction of cells. The oxidation-reduction process was accompanied by the increase of reactive oxygen species and antioxidant levels after hexavalent chromium treatment. Michaelis-Menten constant (K(m)) and maximum reaction rate (V(max)), obtained from the Lineweaver-Burk plot were 14.68 μM and 434 μM min(-1) mg(-1) of protein, respectively. Scanning electron microscopy and Raman spectra analyses manifested that both Cr(VI) and Cr(III) species were present on the mycelium. Fourier transform-infrared spectroscopy analysis suggested that carboxyl, hydroxide, amine, amide, cyano-group, and phosphate groups from the fungal cell wall were involved in chromium binding by the complexation with the Cr(III) and Cr(VI) species. A Cr(VI) removal mechanism of Cr(VI) reduction followed by the surface immobilization and intracellular accumulation of Cr(III) in living A. niger was present.
Collapse
Affiliation(s)
- Yanling Gu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Simultaneous biodegradation of bisphenol A and a biogenic substrate in semi-continuous activated sludge reactors. Biodegradation 2015; 26:183-95. [DOI: 10.1007/s10532-015-9726-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 03/17/2015] [Indexed: 10/23/2022]
|
19
|
Mahmoud MR, Lazaridis NK. Simultaneous Removal of Nickel(II) and Chromium(VI) from Aqueous Solutions and Simulated Wastewaters by Foam Separation. SEP SCI TECHNOL 2015. [DOI: 10.1080/01496395.2014.978456] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
20
|
Michailides MK, Tekerlekopoulou AG, Akratos CS, Coles S, Pavlou S, Vayenas DV. Molasses as an efficient low-cost carbon source for biological Cr(VI) removal. JOURNAL OF HAZARDOUS MATERIALS 2015; 281:95-105. [PMID: 25160055 DOI: 10.1016/j.jhazmat.2014.08.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Revised: 07/31/2014] [Accepted: 08/06/2014] [Indexed: 06/03/2023]
Abstract
In the present study, indigenous microorganisms from industrial sludge were used to reduce the activity of Cr(VI). Molasses, a by-product of sugar processing, was selected as the carbon source (instead of sugar used in a previous work) as it is a low-cost energy source for bioprocesses. Initially, experiments were carried out in suspended growth batch reactors for Cr(VI) concentrations of 1.5-110 mg/L. The time required for complete Cr(VI) reduction increased with initial Cr(VI) concentration. Initial molasses concentration was also found to influence the Cr(VI) reduction rate. The optimal concentration for all initial Cr(VI) concentrations tested was 0.8 gC/L. Experiments were also carried out in packed-bed reactors. Three different operating modes were used to investigate the optimal performance and efficiency of the filter, i.e. batch, continuous and SBR with recirculation. The latter mode with a recirculation rate of 0.5L/min lead to significantly high Cr(VI) reduction rates (up to 135 g/m(2)d). The results of this work were compared with those of a similar work using sugar as the carbon source and indicate that molasses could prove a feasible technological solution to a serious environmental problem.
Collapse
Affiliation(s)
- Michail K Michailides
- Department of Environmental and Natural Resources Management, University of Patras, 2 G. Seferi Str., GR-30100 Agrinio, Greece
| | - Athanasia G Tekerlekopoulou
- Department of Environmental and Natural Resources Management, University of Patras, 2 G. Seferi Str., GR-30100 Agrinio, Greece.
| | - Christos S Akratos
- Department of Environmental and Natural Resources Management, University of Patras, 2 G. Seferi Str., GR-30100 Agrinio, Greece
| | - Sandra Coles
- Department of Environmental and Natural Resources Management, University of Patras, 2 G. Seferi Str., GR-30100 Agrinio, Greece
| | - Stavros Pavlou
- Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou Str., Platani, P.O. Box 1414, GR-26504 Patras, Greece; Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece
| | - Dimitrios V Vayenas
- Department of Environmental and Natural Resources Management, University of Patras, 2 G. Seferi Str., GR-30100 Agrinio, Greece; Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou Str., Platani, P.O. Box 1414, GR-26504 Patras, Greece
| |
Collapse
|
21
|
San Keskin NO, Celebioglu A, Sarioglu OF, Ozkan AD, Uyar T, Tekinay T. Removal of a reactive dye and hexavalent chromium by a reusable bacteria attached electrospun nanofibrous web. RSC Adv 2015. [DOI: 10.1039/c5ra15601g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Bacteria have been immobilized onto a polysulfone nanofibrous web and used for the removal of reactive dye and heavy metal.
Collapse
Affiliation(s)
- Nalan Oya San Keskin
- Polatlı Science and Literature Faculty
- Biology Department
- Gazi University
- Ankara 06900
- Turkey
| | - Aslı Celebioglu
- UNAM-National Nanotechnology Research Center
- Bilkent University
- Ankara 06800
- Turkey
- Institute of Materials Science and Nanotechnology
| | - Omer Faruk Sarioglu
- UNAM-National Nanotechnology Research Center
- Bilkent University
- Ankara 06800
- Turkey
- Institute of Materials Science and Nanotechnology
| | - Alper Devrim Ozkan
- UNAM-National Nanotechnology Research Center
- Bilkent University
- Ankara 06800
- Turkey
- Institute of Materials Science and Nanotechnology
| | - Tamer Uyar
- UNAM-National Nanotechnology Research Center
- Bilkent University
- Ankara 06800
- Turkey
- Institute of Materials Science and Nanotechnology
| | - Turgay Tekinay
- Life Sciences Application and Research Center
- Gazi University
- Ankara 06830
- Turkey
- Faculty of Medicine
| |
Collapse
|
22
|
Pan X, Liu Z, Chen Z, Cheng Y, Pan D, Shao J, Lin Z, Guan X. Investigation of Cr(VI) reduction and Cr(III) immobilization mechanism by planktonic cells and biofilms of Bacillus subtilis ATCC-6633. WATER RESEARCH 2014; 55:21-9. [PMID: 24583840 DOI: 10.1016/j.watres.2014.01.066] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 12/10/2013] [Accepted: 01/31/2014] [Indexed: 05/14/2023]
Abstract
In this study, we investigated the Cr(VI) uptake mechanism of planktonic cells and biofilms of Bacillus subtilis (B. subtilis) ATCC-6633. Data showed that the effect of planktonic cells on the Cr(VI) uptake was quite different from that of biofilms. Planktonic cells had strong ability of Cr(VI) reduction, while biofilms possessed a great potential of Cr(III) immobilization. For planktonic cells, 100 mg/L Cr(VI) could be completely reduced. Both exopolymeric substances and cytoplasmic extracts contributed to high capacity of Cr(VI) reduction. After the reduction, noticeable Cr(III) precipitates were accumulated on bacterial surfaces, but 37.5% Cr(III) still remained in the supernatant. For biofilms, the biofilm debris became the main active ingredient of the Cr(VI) reduction. However, only 20 mg/L Cr(VI) could be reduced probably because of unavailability of reducing active sites during the biofilm formation. Further studies showed that biofilms had a better Cr(III) immobilization capacity than planktonic cells with 100% Cr(III) immobilized. Moreover, for the first time, we proposed a strategy combining the advantages of both planktonic cells and biofilms, and a successful Cr(VI) removal from typical Cr(VI)-containing plating wastewater was achieved through a 10-L pilot-scale experiment.
Collapse
Affiliation(s)
- Xiaohong Pan
- Key Lab of Biopesticide and Chemical Biology, Fujian Agriculture and Forestry University, Ministry of Education, Fuzhou, Fujian 350002, PR China; State Key Lab of Structural Chemistry, Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
| | - Zunjing Liu
- State Key Lab of Structural Chemistry, Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
| | - Zhi Chen
- Key Lab of Biopesticide and Chemical Biology, Fujian Agriculture and Forestry University, Ministry of Education, Fuzhou, Fujian 350002, PR China; State Key Lab of Structural Chemistry, Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
| | - Yangjian Cheng
- State Key Lab of Structural Chemistry, Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
| | - Danmei Pan
- State Key Lab of Structural Chemistry, Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
| | - Jiening Shao
- Fuzhou No. 3 Middle School, Fuzhou, Fujian 350003, PR China
| | - Zhang Lin
- State Key Lab of Structural Chemistry, Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.
| | - Xiong Guan
- Key Lab of Biopesticide and Chemical Biology, Fujian Agriculture and Forestry University, Ministry of Education, Fuzhou, Fujian 350002, PR China.
| |
Collapse
|
23
|
Barrera-Díaz CE, Lugo-Lugo V, Bilyeu B. A review of chemical, electrochemical and biological methods for aqueous Cr(VI) reduction. JOURNAL OF HAZARDOUS MATERIALS 2012; 223-224:1-12. [PMID: 22608208 DOI: 10.1016/j.jhazmat.2012.04.054] [Citation(s) in RCA: 598] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 03/23/2012] [Accepted: 04/23/2012] [Indexed: 05/27/2023]
Abstract
Hexavalent chromium is of particular environmental concern due to its toxicity and mobility and is challenging to remove from industrial wastewater. It is a strong oxidizing agent that is carcinogenic and mutagenic and diffuses quickly through soil and aquatic environments. It does not form insoluble compounds in aqueous solutions, so separation by precipitation is not feasible. While Cr(VI) oxyanions are very mobile and toxic in the environment, Cr(III) cations are not. Like many metal cations, Cr(III) forms insoluble precipitates. Thus, reducing Cr(VI) to Cr(III) simplifies its removal from effluent and also reduces its toxicity and mobility. In this review, we describe the environmental implications of Cr(VI) presence in aqueous solutions, the chemical species that could be present and then we describe the technologies available to efficiently reduce hexavalent chromium.
Collapse
Affiliation(s)
- Carlos E Barrera-Díaz
- Centro Conjunto de Investigación en Química Sustentable UAEM - UNAM, Carretera Toluca-Atlacomulco, km 14.5, Unidad El Rosedal, C.P. 50200, Toluca, Estado de México, Mexico.
| | | | | |
Collapse
|