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Zhang M, Liao C, Zhang Z, Lu L, Chen J, Chen D. Enhancing biodegradation of gaseous chlorobenzene by introducing micro-nano bubbles (MNBs): Performance and mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2025; 494:138745. [PMID: 40449219 DOI: 10.1016/j.jhazmat.2025.138745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2024] [Revised: 05/20/2025] [Accepted: 05/25/2025] [Indexed: 06/03/2025]
Abstract
Chlorobenzene (CB) biodegradation is challenging due to its hydrophobic characteristics. Addition of silicone oil and surfactants are commonly used methods to enhance biodegradation efficiency by improve CB gas-liquid mass transfer efficiency. However, both approaches introduced new chemicals into the reactor, either as carbon sources for microorganisms or requiring regeneration. This study established a synergistic reactor by applying micro-nano bubbles (MNBs) with biodegradation process in a stirred tank bioreactor (STB) to purify CB waste gas. Experimental results demonstrate a reduction in start-up time by 2 days and a 13.5 % increase in overall degradation rate in synergistic reactor. The mass transfer fraction of CB (β*s) was increased by 13.33 %. Additionally, the synergistic reactor showed improved system stability and microbial activity, evidenced by the increased Zeta potential, extracellular polymer substances (EPS) secretion, and protein content. Notably, MNBs upregulate genes involved in aromatic ring hydroxylation and dehalogenation processes and promoted the enzyme SCACT (EC2.8.3.18) within the genus Acidovorax, which enhanced intracellular coenzyme A activity and facilitated chlorobenzene degradation in this genus, thereby enhancing CB degradation efficiency. These results indicate that MNBs can significantly improve the biodegradation performance of CB waste gas, offering a promising strategy for industrial applications.
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Affiliation(s)
- Minmin Zhang
- School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China; Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry, Zhoushan 316022, China
| | - Chenyan Liao
- School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China
| | - Zhonghuai Zhang
- Lishui Supply & Discharge Water Co., Ltd, 155 Beihuan Road, Liandu Sistrict, Lishui, Zhejiang 323000, China
| | - Lichao Lu
- School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China; Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry, Zhoushan 316022, China
| | - Jianmeng Chen
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, China
| | - Dongzhi Chen
- School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China; Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry, Zhoushan 316022, China.
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2
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Gupta AD, Jaiswal VK, Chabhadiya K, Singh RS, Gupta MK, Singh H. A critical review on the properties and applications of bulk micro and nanobubbles for the degradation of organic pollutants in wastewater treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2025; 976:179310. [PMID: 40188725 DOI: 10.1016/j.scitotenv.2025.179310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2025] [Revised: 02/19/2025] [Accepted: 03/30/2025] [Indexed: 04/23/2025]
Abstract
The presence of persistent organic pollutants in wastewater streams has presented significant challenges towards their removal. In the recent decade, bulk micro (1-100 μm) and nanobubble (50-150 nm) (MNB) technology has exhibited technological advancements via integration of MNB technology in degrading organic pollutants from wastewater streams. The present review critically analyses the physico-chemical properties such as stability, zeta potential, mass transfer rates, rising velocity and size distribution of MNBs. The paradigm shift from conventional wastewater treatment to more sustainable solution is initiated by the production of OH- ions and free radicals for the degradation of organic pollutants by the MNB technology. Applications of MNBs are also explored in various wastewater treatment processes such as floatation, membrane cleaning, adsorption, aeration, and advanced oxidation processes. Future researches highlighting the challenges in the development of efficient and robust MNB technology and its real-time applications have also been highlighted. It is anticipated that MNBs could be a sustainable and economic solution for wastewater treatment.
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Affiliation(s)
- Arijit Dutta Gupta
- Department of Chemical, Petroleum & Hydrogen Technology, NIMS University, Rajasthan, Jaipur 303121, India; Department of Chemical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, India
| | - Vivek Kumar Jaiswal
- Department of Chemical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Karan Chabhadiya
- Krakow School for Interdisciplinary PhD Studies, Polish Academy of Sciences, Krakow 31-342, Poland; Division of Biogenic Raw Material, Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Krakow 31-261, Poland
| | - Ram Sharan Singh
- Department of Chemical Engineering & Technology, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - M K Gupta
- Department of Mechanical Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur 273010, India
| | - Harinder Singh
- Department of Chemical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, India.
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3
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Xu Z, Wang T, Peng C, Feng Y, Fan X, Yang X, Gao W, Zhang Q. Air nanobubble simultaneously enhances hydrolysis and methane yield of sludge temperature phased-anaerobic digestion. BIORESOURCE TECHNOLOGY 2025; 419:132084. [PMID: 39824323 DOI: 10.1016/j.biortech.2025.132084] [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: 10/05/2024] [Revised: 01/03/2025] [Accepted: 01/14/2025] [Indexed: 01/20/2025]
Abstract
Nanobubble water (NBW) or temperature-phased anaerobic digestion assisted by microbial electrolysis cell (MEC-TPAD) can promote sludge hydrolysis and methanogenesis. However, the role of the combined application of NBW and MEC-TPAD in terms of anaerobic performance and related microbial properties remains unclear. This study investigated the impact of Air-NBW on hydrolysis and methanogenesis of dewatered sludge MEC-TPAD. Under different temperatures, NBW increased ammonia nitrogen by 7.8%-13.7% in the hydrolysis phase and ultimate methane yield by 23.3%-41.5%. NBW can significantly promote hydrolysis under mesophilic-mesophilic conditions, while it can promote substantially methanogenesis under thermophilic-thermophilic conditions. Moreover, NBW increased the diversity and richness of microorganisms in hydrolysis. As to bacteria, NBW increased the relative abundance (RA) of Firmicutes but decreased the RA of Proteobacteria. As to archaea, NBW increased the RA of Methanosarcina in hydrolysis but decreased it in methanogenesis. NBW synchronized with MEC-TPAD improved hydrolysis and methanogenesis of the dewatered sludge digestion process.
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Affiliation(s)
- Ziying Xu
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Tianfeng Wang
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
| | - Cheng Peng
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Yutong Feng
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Xin Fan
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Xuan Yang
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Wenqi Gao
- School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China
| | - Qingfang Zhang
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Gao JY, Cai WF, Bai JR, Zhu YC, Zhang YX, Wang S, Guo K, Chen QY, Wang YH. Strengthening H 2 gas-liquid mass transfer using superaerophobic cathodes for enhanced methane production from CO 2 in H 2-mediated microbial electrosynthesis system. BIORESOURCE TECHNOLOGY 2025; 417:131850. [PMID: 39571657 DOI: 10.1016/j.biortech.2024.131850] [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: 07/31/2024] [Revised: 11/16/2024] [Accepted: 11/18/2024] [Indexed: 11/25/2024]
Abstract
H2-mediated microbial electrosynthesis (MES) could run under a high current density, but the low solubility of H2 limited its performance. Reducing the H2 bubble size facilitates H2 gas-liquid mass transfer and it has been reported to be realized on superaerophobic electrodes. Therefore, we adopted a CoP nanowire-modified nickel foam (CoP-NiF) as the superaerophobic cathode in a H2-mediated MES reactor to enhance the methane production from CO2. The CoP nanowire modification reduced the average diameter of H2 bubbles from ∼ 300 μm to ∼ 100 μm, thereby exhibiting a 129 % enhancement of the H2 mass transfer coefficient (KLa = 0.32 min-1). The maximum CH4 production rate with CoP-NiF cathode exhibited a 27 % improvement (2.31 L/L/d) at a high current density of 166.67 A/m2. More importantly, a coulombic efficiency higher than 80 % was achieved in the reactor. These results demonstrated that using superaerophobic cathodes is an efficient way to enhance the performance of H2-mediated MES reactors.
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Affiliation(s)
- Jia-Yao Gao
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Wen-Fang Cai
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Ji-Rui Bai
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yu-Cheng Zhu
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yu-Xiao Zhang
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Sheng Wang
- Shanghai Zelixir Biotech Company Ltd., Shanghai 200030, China
| | - Kun Guo
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Qing-Yun Chen
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yun-Hai Wang
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
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5
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Zhang Z, Li J, Jiang Y, Zhao L, Bai L, Yang J, Pang H, Lu J. Emission Characteristics of Aerosols Generated during the Micro-Nano Bubble Aeration Process in Wastewater. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:17396-17405. [PMID: 39192731 DOI: 10.1021/acs.est.4c00986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
Micro-nano bubble (MNB) aeration is an emerging technology that considerably enhances the aeration efficiency of wastewater. This study evaluates, for the first time, aerosolization at the water-air interface during MNB aeration. Our results show that the concentration of culturable mixed microorganisms (i.e., bacteria, fungi, and intestinal bacteria) in the in situ MNB generation (MNBs-G) phase is 2170 CFU/m3, 1.38 and 1.58-fold higher than those in medium-bubble aeration (MBA; 1568 CFU/m3) and small-bubble aeration (SBA; 1376 CFU/m3) aerosols, respectively. Conversely, the concentration of culturable mixed microorganisms in the MNB persistent dissolved oxygen (MNBs-O) phase is only 914 CFU/m3. Microbiological analysis shows a lower abundance of bacterial pathogens in MNBs-G (34.12%) and MNBs-O (34.02%) phases than in MBA (39.63%) and SBA (38.87%) aerosols. Acinetobacter is prevalent in MNBs-G (14.76%) and MNBs-O (8.22%) aerosols, whereas Bacillus and Arcobacter are prevalent in MBA (23.96%) and SBA (6.92%) aerosols, respectively. The total concentrations of chemicals [i.e., total organic carbon, water-soluble ions, and metal(loid)s] in aerosols formed via MNB aeration (205.98-373.74 μg/m3) are lower than those in MBA and SBA (398.69-594.92 μg/m3). Compared to MBA and SBA, the MNBs-G phase exhibits higher emissions of 12 elements in aerosols (i.e., NO3-, NO2-, Ca2+, Na+, K+, Mg2+, Zn, Cd, Fe, Mn, As, and Cr), whereas the MNBs-O phase generally shows lower emissions. These findings highlight the potential of optimized MNB aeration technology in considerably mitigating aerosol emissions and thereby advancing environmental sustainability in wastewater treatment.
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Affiliation(s)
- Zhiqiang Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jin Li
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
| | - Yijin Jiang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
| | - Lei Zhao
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
| | - Langming Bai
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jing Yang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
| | - Heliang Pang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
| | - Jinsuo Lu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
- Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xian 710055, China
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Zhou C, Yu Y, Zeng W, Feng S, Li J. Effects of microbubble pretreatment on physiochemical and microbial properties of excess activated sludge. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:12528-12542. [PMID: 38233712 DOI: 10.1007/s11356-024-31939-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 01/05/2024] [Indexed: 01/19/2024]
Abstract
Fast increased amount of excess activated sludge (EAS) from wastewater treatment plants has aroused universal concerns on its environmental risks and demands for appropriate treatments, while effective treatment is dependent upon proper pretreatment. In this study, air-supplied microbubbles (air-MBs) with generated size of 25.18 to 28.25 μm were used for EAS pretreatment. Different durations (30, 60, 90, and 120 s) yielded sludge with varied physiochemical conditions, and 60 s decreased sludge oxidation status and significantly increased adenosine triphosphate (ATP) content. Soluble, loosely-bound, and tightly-bound extracellular polymeric substances (SEPS, LB-EPS, and TB-EPS) were extracted from the sludge through a stepwise approach and examined through three-dimensional excitation-emission matrix (3D-EEM) and quantitative analysis. The results showed that 60- and 120-s treatments generated stronger fluorescence intensities on dissolved organic matters (DOMs) of protein-like and fulvic acid in LB-EPS and TB-EPS, which indicated the decrease of counterparts in EAS, and therefore facilitated sludge dewaterability and reduction. The dominant microbial communities in EAS, including Proteobacteria, Bacteroidota, Chloroflexi, and Actinobacteriota, were not significantly affected by MB pretreatment. The results collectively revealed the effects of MB pretreatment on EAS and indicated that MBs could be an effective pretreatment technique for EAS treatment process.
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Affiliation(s)
- Cuihong Zhou
- Beijing Institute of Petrochemical Technology, College of Mechanical Engineering, Beijing, 102617, China
| | - Yiqiong Yu
- Beijing Institute of Petrochemical Technology, College of Mechanical Engineering, Beijing, 102617, China
| | - Wanlin Zeng
- Beijing Institute of Petrochemical Technology, College of Mechanical Engineering, Beijing, 102617, China
- E20 Institute of Environment Industry, Beijing, 100093, China
| | - Shugeng Feng
- Beijing Institute of Petrochemical Technology, College of Mechanical Engineering, Beijing, 102617, China.
| | - Jiangting Li
- Beijing Institute of Petrochemical Technology, College of Mechanical Engineering, Beijing, 102617, China
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Tong WK, Dai C, Hu J, Li J, Gao MT, You X, Feng XR, Li Z, Zhou L, Zhang Y, Lai X, Kahon L, Fu R. A novel eco-friendly strategy for removing phenanthrene from groundwater: Synergism of nanobubbles and rhamnolipid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:168099. [PMID: 37884130 DOI: 10.1016/j.scitotenv.2023.168099] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/21/2023] [Accepted: 10/22/2023] [Indexed: 10/28/2023]
Abstract
Nanobubbles (NBs), given their unique properties, could theoretically be paired with rhamnolipids (RL) to tackle polycyclic aromatic hydrocarbon contamination in groundwater. This approach may overcome the limitations of traditional surfactants, such as high toxicity and low efficiency. In this study, the remediation efficiency of RL, with or without NBs, was assessed through soil column experiments (soil contaminated with phenanthrene). Through the analysis of the two-site non-equilibrium diffusion model, there was a synergistic effect between NBs and RL. The introduction of NBs led to a reduction of up to 24.3 % in the total removal time of phenanthrene. The direct reason for this was that with NBs, the retardation factor of RL was reduced by 1.9 % to 15.4 %, which accelerated the solute replacement of RL. The reasons for this synergy were multifaceted. Detailed analysis reveals that NBs improve RL's colloidal stability, increase its absolute zeta potential, and reduce its soil adsorption capacity by 13.3 %-19.9 %. Furthermore, NBs and their interaction with RL substantially diminish the surface tension, contact angle, and dynamic viscosity of the leaching solution. These changes in surface thermodynamic and rheological properties significantly enhance the migration efficiency of the eluent. The research outcomes facilitate a thorough comprehension of NBs' attributes and their relevant applications, and propose an eco-friendly method to improve the efficiency of surfactant remediation.
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Affiliation(s)
- Wang Kai Tong
- College of Civil Engineering, Tongji University, Shanghai 200092, China; Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Chaomeng Dai
- College of Civil Engineering, Tongji University, Shanghai 200092, China.
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Jixiang Li
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Xueji You
- College of Civil Engineering, Tongji University, Shanghai 200092, China
| | - Xin Ru Feng
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Zhi Li
- College of Civil Engineering, Tongji University, Shanghai 200092, China
| | - Lang Zhou
- Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78712, United States
| | - Yalei Zhang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Xiaoying Lai
- College of Management and Economics, Tianjin University, Tianjin 300072, China
| | - Long Kahon
- Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universitiy Tunku Abdul Rahman, 31900 Kampar, Perak, Malaysia
| | - Rongbing Fu
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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Lyu T, Wu Y, Zhang Y, Fan W, Wu S, Mortimer RJG, Pan G. Nanobubble aeration enhanced wastewater treatment and bioenergy generation in constructed wetlands coupled with microbial fuel cells. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 895:165131. [PMID: 37364834 DOI: 10.1016/j.scitotenv.2023.165131] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 06/09/2023] [Accepted: 06/23/2023] [Indexed: 06/28/2023]
Abstract
Artificial aeration is a widely used approach in wastewater treatment to enhance the removal of pollutants, however, traditional aeration techniques have been challenging due to the low oxygen transfer rate (OTR). Nanobubble aeration has emerged as a promising technology that utilise nano-scale bubbles to achieve higher OTRs owing to their large surface area and unique properties such as longevity and reactive oxygen species generation. This study, for the first time, investigated the feasibility of coupling nanobubble technology with constructed wetlands (CWs) for treating livestock wastewater. The results demonstrated that nanobubble-aerated CWs achieved significantly higher removal efficiencies of total organic carbon (TOC) and ammonia (NH4+-N), at 49 % and 65 %, respectively, compared to traditional aeration treatment (36 % and 48 %) and the control group (27 % and 22 %). The enhanced performance of the nanobubble-aerated CWs can be attributed to the nearly three times higher amount of nanobubbles (Ø < 1 μm) generated from the nanobubble pump (3.68 × 108 particles/mL) compared to the normal aeration pump. Moreover, the microbial fuel cells (MFCs) embedded in the nanobubble-aerated CWs harvested 5.5 times higher electricity energy (29 mW/m2) compared to the other groups. The results suggested that nanobubble technology has the potential to trigger the innovation of CWs by enhancing their capacity for water treatment and energy recovery. Further research needs are proposed to optimise the generation of nanobubbles, allowing them to be effectively coupled with different technologies for engineering implementation.
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Affiliation(s)
- Tao Lyu
- School of Water, Energy and Environment, Cranfield University, College Road, Bedfordshire MK43 0AL, UK
| | - Yuncheng Wu
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210000, China
| | - Yang Zhang
- Shenzhen Guanghuiyuan Environment Water Co., Ltd., Shenzhen 518038, China
| | - Wei Fan
- School of Environment, Northeast Normal University, 2555 Jingyue Street, Changchun 130117, China
| | - Shubiao Wu
- Department of Agroecology, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark
| | - Robert J G Mortimer
- School of Humanities, York St John University, Lord Mayor's Walk, York YO31 7EX, UK
| | - Gang Pan
- School of Humanities, York St John University, Lord Mayor's Walk, York YO31 7EX, UK.
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Jia M, Farid MU, Kharraz JA, Kumar NM, Chopra SS, Jang A, Chew J, Khanal SK, Chen G, An AK. Nanobubbles in water and wastewater treatment systems: Small bubbles making big difference. WATER RESEARCH 2023; 245:120613. [PMID: 37738940 DOI: 10.1016/j.watres.2023.120613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 07/22/2023] [Accepted: 09/09/2023] [Indexed: 09/24/2023]
Abstract
Since the discovery of nanobubbles (NBs) in 1994, NBs have been attracting growing attention for their fascinating properties and have been studied for application in various environmental fields, including water and wastewater treatment. However, despite the intensive research efforts on NBs' fundamental properties, especially in the past five years, controversies and disagreements in the published literature have hindered their practical implementation. So far, reviews of NB research have mainly focused on NBs' role in specific treatment processes or general applications, highlighting proof-of-concept and success stories primarily at the laboratory scale. As such, there lacks a rigorous review that authenticates NBs' potential beyond the bench scale. This review aims to provide a comprehensive and up-to-date analysis of the recent progress in NB research in the field of water and wastewater treatment at different scales, along with identifying and discussing the challenges and prospects of the technology. Herein, we systematically analyze (1) the fundamental properties of NBs and their relevancy to water treatment processes, (2) recent advances in NB applications for various treatment processes beyond the lab scale, including over 20 pilot and full-scale case studies, (3) a preliminary economic consideration of NB-integrated treatment processes (the case of NB-flotation), and (4) existing controversies in NBs research and the outlook for future research. This review is organized with the aim to provide readers with a step-by-step understanding of the subject matter while highlighting key insights as well as knowledge gaps requiring research to advance the use of NBs in the wastewater treatment industry.
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Affiliation(s)
- Mingyi Jia
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region
| | - Muhammad Usman Farid
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region.
| | - Jehad A Kharraz
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region; Department of Chemical and Petroleum Engineering, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, UAE
| | - Nallapaneni Manoj Kumar
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region; Center for Circular Supplies, HICCER - Hariterde International Council of Circular Economy Research, Palakkad, Kerala 678631, India
| | - Shauhrat S Chopra
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region
| | - Am Jang
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - John Chew
- Department of Chemical Engineering, University of Bath, Bath BA2 7AY, UK
| | - Samir Kumar Khanal
- Department of Molecular Biosciences and Bioengineering, University of Hawai'i at Manoa, 1955 East-West Road, Honolulu, HI 96822, United States
| | - Guanghao Chen
- Department of Civil and Environmental Engineering, Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution and Water Technology Center, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Alicia Kyoungjin An
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region.
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10
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Wang E, Sun H, Chen P, Zheng Y, Guo J, Dong R. Two-step anaerobic digestion of rice straw with nanobubble water. BIORESOURCE TECHNOLOGY 2023; 376:128928. [PMID: 36940882 DOI: 10.1016/j.biortech.2023.128928] [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: 01/28/2023] [Revised: 03/13/2023] [Accepted: 03/16/2023] [Indexed: 06/18/2023]
Abstract
Lignocellulose usually requires pretreatment to improve biogas production. To enhance lignocellulose biodegradability and improve anaerobic digestion (AD) efficiency, different types (N2, CO2, and O2) of nanobubble water (NW) were applied in this study as soaking agent and AD accelerant to increase the biogas yield of rice straw. The results showed that the cumulative methane yields of treating with NW in two-step AD increased by 11.0%-21.4% compared with untreated straw. The maximum cumulative methane yield was 313.9±1.7 mL/gVS in straw treated with CO2-NW as soaking agent and AD accelerant (PCO2-MCO2). The application of CO2-NW and O2-NW as AD accelerants increased bacterial diversity and relative abundance of Methanosaeta. This study suggested that using NW could enhance soaking pretreatment and methane production of rice straw in two-step AD; however, combined treatment with inoculum and NW or microbubble water in the pretreatment needs to compare in future.
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Affiliation(s)
- Enzhen Wang
- College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing 100083, PR China
| | - Hui Sun
- College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, PR China
| | - Penghui Chen
- College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing 100083, PR China
| | - Yonghui Zheng
- College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing 100083, PR China
| | - Jianbin Guo
- College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing 100083, PR China.
| | - Renjie Dong
- College of Engineering (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), China Agricultural University, Beijing 100083, PR China
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Dubey S, Chen CW, Haldar D, Tambat VS, Kumar P, Tiwari A, Singhania RR, Dong CD, Patel AK. Advancement in algal bioremediation for organic, inorganic, and emerging pollutants. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 317:120840. [PMID: 36496067 DOI: 10.1016/j.envpol.2022.120840] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 11/25/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
Rapidly changing bioremediation prospects are key drive to develop sustainable options that can offer extra benefits rather than only environmental remediation. Algal remediating is gaining utmost attention due to its mesmerising sustainable features, removing odour and toxicity, co-remediating numerous common and emerging inorganic and organic pollutants from gaseous and aqueous environments, and yielding biomass for a range of valuable products refining. Moreover, it also improves carbon footprint via carbon-capturing offers a better option than any other non-algal process for several high CO2-emitting industries. Bio-uptake, bioadsorption, photodegradation, and biodegradation are the main mechanisms to remediate a range of common and emerging pollutants by various algae species. Bioadsorption was a dominant remediation mechanism among others implicating surface properties of pollutants and algal cell walls. Photodegradable pollutants were photodegraded by microalgae by adsorbing photons on the surface and intracellularly via stepwise photodissociation and breakdown. Biodegradation involves the transportation of selective pollutants intracellularly, and enzymes help to convert them into simpler non-toxic forms. Robust models are from the green microalgae group and are dominated by Chlorella species. This article compiles the advancements in microalgae-assisted pollutants remediation and value-addition under sustainable biorefinery prospects. Moreover, filling the knowledge gaps, and recommendations for developing an effective platform for emerging pollutants remediation and realization of commercial-scale algal bioremediation.
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Affiliation(s)
- Siddhant Dubey
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan
| | - Chiu-Wen Chen
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Sustainable Environment Research Centre, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Department of Marine Environmental Engineering, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan
| | - Dibyajyoti Haldar
- Department of Biotechnology, Karunya Institute of Technology and Sciences, Coimbatore, 641114, India
| | - Vaibhav Sunil Tambat
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan
| | - Prashant Kumar
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan
| | - Ashutosh Tiwari
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan
| | - Reeta Rani Singhania
- Sustainable Environment Research Centre, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Department of Marine Environmental Engineering, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Department of Biotechnology, Karunya Institute of Technology and Sciences, Coimbatore, 641114, India
| | - Cheng-Di Dong
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Sustainable Environment Research Centre, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Department of Marine Environmental Engineering, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan
| | - Anil Kumar Patel
- Institute of Aquatic Science and Technology, College of Hydrosphere, National Kaohsiung University of Science and Technology, Kaohsiung City, 81157, Taiwan; Centre for Energy and Environmental Sustainability, Lucknow, 226 029, Uttar Pradesh, India.
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12
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Park Y, Jin S, Noda I, Jung YM. Continuing progress in the field of two-dimensional correlation spectroscopy (2D-COS), part II. Recent noteworthy developments. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 284:121750. [PMID: 36030669 DOI: 10.1016/j.saa.2022.121750] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/30/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
This comprehensive survey review compiles noteworthy developments and new concepts of two-dimensional correlation spectroscopy (2D-COS) for the last two years. It covers review articles, books, proceedings, and numerous research papers published on 2D-COS, as well as patent and publication trends. 2D-COS continues to evolve and grow with new significant developments and versatile applications in diverse scientific fields. The healthy, vigorous, and diverse progress of 2D-COS studies in many fields strongly confirms that it is well accepted as a powerful analytical technique to provide an in-depth understanding of systems of interest.
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Affiliation(s)
- Yeonju Park
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, South Korea
| | - Sila Jin
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, South Korea
| | - Isao Noda
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA.
| | - Young Mee Jung
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, South Korea; Department of Chemistry, and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, South Korea.
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13
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Park Y, Jin S, Noda I, Jung YM. Continuing progress in the field of two-dimensional correlation spectroscopy (2D-COS): Part III. Versatile applications. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 284:121636. [PMID: 36229084 DOI: 10.1016/j.saa.2022.121636] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 06/30/2022] [Accepted: 07/12/2022] [Indexed: 06/16/2023]
Abstract
In this review, the comprehensive summary of two-dimensional correlation spectroscopy (2D-COS) for the last two years is covered. The remarkable applications of 2D-COS in diverse fields using many types of probes and perturbations for the last two years are highlighted. IR spectroscopy is still the most popular probe in 2D-COS during the last two years. Applications in fluorescence and Raman spectroscopy are also very popularly used. In the external perturbations applied in 2D-COS, variations in concentration, pH, and relative compositions are dramatically increased during the last two years. Temperature is still the most used effect, but it is slightly decreased compared to two years ago. 2D-COS has been applied to diverse systems, such as environments, natural products, polymers, food, proteins and peptides, solutions, mixtures, nano materials, pharmaceuticals, and others. Especially, biological and environmental applications have significantly emerged. This survey review paper shows that 2D-COS is an actively evolving and expanding field.
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Affiliation(s)
- Yeonju Park
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Sila Jin
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Isao Noda
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA.
| | - Young Mee Jung
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Republic of Korea; Department of Chemistry, and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea.
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Zhou S, Liu M, Chen B, Sun L, Lu H. Microbubble- and nanobubble-aeration for upgrading conventional activated sludge process: A review. BIORESOURCE TECHNOLOGY 2022; 362:127826. [PMID: 36029987 DOI: 10.1016/j.biortech.2022.127826] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 08/18/2022] [Accepted: 08/21/2022] [Indexed: 06/15/2023]
Abstract
The activated sludge process (ASP) is widely used for wastewater treatment, and the aeration efficiency is crucial to the operation of wastewater treatment plants. Recently, microbubble (MB)- and nanobubble (NB)-aeration has attracted much attention as there is growing evidence that it holds a great promise for upgrading the process efficiency of current ASP under conventional macro-bubble-aeration. However, a comprehensive review to elucidate the potential application of MB- and NB-aeration in ASP is still lacking. Therefore, this review will provide a systematic introduction to MB- and NB-aeration (including the unique properties and generation methods of MBs and NBs), and gain mechanistic insights on how MB- and NB-aeration improve gas-liquid mass transfer. The recent advances in MB- and NB-aeration applications to ASP and the resultant effects are also highlighted and discussed in-depth. The review concludes with a brief consideration of future research interests.
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Affiliation(s)
- Sining Zhou
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, PR China
| | - Min Liu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, PR China
| | - Ben Chen
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, PR China
| | - Lianpeng Sun
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, PR China
| | - Hui Lu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, PR China.
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15
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Yaparatne S, Doherty ZE, Magdaleno AL, Matula EE, MacRae JD, Garcia-Segura S, Apul OG. Effect of air nanobubbles on oxygen transfer, oxygen uptake, and diversity of aerobic microbial consortium in activated sludge reactors. BIORESOURCE TECHNOLOGY 2022; 351:127090. [PMID: 35358670 DOI: 10.1016/j.biortech.2022.127090] [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: 02/08/2022] [Revised: 03/25/2022] [Accepted: 03/27/2022] [Indexed: 06/14/2023]
Abstract
Nanobubbles have the potential to curtail the loss of oxygen during activated sludge aeration due to their extensive surface areas and lack of buoyance in solution. In this study, nanobubble aeration was explored as a novel approach to enhance aerobic activated sludge treatment and benchmarked against coarse bubble aeration at the lab scale. Nanobubble aerated activated sludge reactors achieved greater dissolved oxygen levels at faster rates. Higher soluble chemical oxygen demand removal by 10% was observed when compared to coarse bubble aeration with the same amount of air. The activated sludge produced compact sludge yielding easier waste sludge for subsequent sludge handling. The samples showed fewer filamentous bacteria with a lower relative abundance of floc forming Corynebacterium, Pseudomonas, and Zoogloea in the sludge. The microbiome of the nanobubble-treated activated sludge showed significant shifts in the abundance of community members at the genus level and significantly lower alpha and beta diversities.
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Affiliation(s)
- Sudheera Yaparatne
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, United States
| | - Zachary E Doherty
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, United States
| | - Andre L Magdaleno
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287, United States
| | - Emily E Matula
- NASA Johnson Space Center, Houston TX 77058, United States
| | - Jean D MacRae
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, United States
| | - Sergi Garcia-Segura
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287, United States
| | - Onur G Apul
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, United States.
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Zhang H, Lu Y, Li Y, Wang C, Yu Y, Zhang W, Wang L, Niu L, Zhang C. Propelling the practical application of the intimate coupling of photocatalysis and biodegradation system: System amelioration, environmental influences and analytical strategies. CHEMOSPHERE 2022; 287:132196. [PMID: 34517239 DOI: 10.1016/j.chemosphere.2021.132196] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/04/2021] [Accepted: 09/06/2021] [Indexed: 06/13/2023]
Abstract
The intimate coupling of photocatalysis and biodegradation (ICPB) possesses an enhanced ability of recalcitrant contaminant removal and energy generation, owing to the compact communication between biotic components and photocatalysts during the system operation. The photocatalysts in the ICPB system could dispose of noxious contaminants to relieve the external pressure on microorganisms which could realize the mineralization of the photocatalytic degradation products. However, due to the complex components in the composite system, the mechanism of the ICPB system has not been completely understood. Moreover, the variable environmental conditions would play a significant role in the ICPB system performance. The further development of the ICPB scheme requires clarification on how to reach an accurate understanding of the system condition during the practical application. This review starts by offering detailed information on the system construction and recent progress in the system components' amelioration. We then describe the potential influences of relevant environmental factors on the system performance, and the analytical strategies applicable for comprehending the critical processes during the system operation are further summarized. Finally, we put forward the research gaps in the current system and envision the system's prospective application. This review provides a valuable reference for future researches that are devoted to assessing the environmental disturbance and exploring the reaction mechanisms during the practical application of the ICPB system.
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Affiliation(s)
- Huanjun Zhang
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
| | - Yin Lu
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
| | - Yi Li
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China.
| | - Chao Wang
- School of Environmental Science and Engineering, Southern University of Science and Technology, Xueyuan Road #1088, Shenzhen, 518055, PR China.
| | - Yanan Yu
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
| | - Wenlong Zhang
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
| | - Longfei Wang
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
| | - Lihua Niu
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
| | - Chi Zhang
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
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Fu HM, Peng MW, Yan P, Wei Z, Fang F, Guo JS, Chen YP. Potential role of nanobubbles in dynamically modulating the structure and stability of anammox granular sludge within biological nitrogen removal process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 784:147110. [PMID: 33901950 DOI: 10.1016/j.scitotenv.2021.147110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 06/12/2023]
Abstract
The generation of visible macrobubbles considerably affects the structure and function of anammox granules in the anammox granular sludge (AnGS) system. However, the existence of nanobubbles (NBs) and their role in maintaining the AnGS structure and stability are unclear because of the complexity of the system and lack of effective analytical methods. In this study, methods for NB analysis and assessment of their effects were developed to investigate the formation and characteristics of NBs in an AnGS system and the effects of NBs on the properties and function of AnGS. The results indicated that dissolved gas supersaturation caused by AnGS generated NBs of 2.75 × 108 bubbles/mL inside an AnGS reactor after running for 300 min at 30 °C. The increasing absolute value of the zeta potential of NBs with time indicated that the NBs in the AnGS system were gradually stable. The size of the stable NBs ranged from 150 nm to 400 nm. NB formation also increased the space and pressure between cells, leading to the breakage of the cell cluster and causing structural changes in granules. Changes in the local granular microstructure caused by NBs were favorable for the porous structure of granules to avoid granular disintegration and flotation caused by the excessive secretion of extracellular polymeric substances blocking gas channels. The formation and stability of NBs penetrating the cell clusters played a crucial role in the formation and stability of nanopores around or inside the cell clusters, further providing a basis for the formation of high-porosity structures and efficient mass transfer of AnGS.
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Affiliation(s)
- Hui-Min Fu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China
| | - Meng-Wen Peng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China
| | - Peng Yan
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China.
| | - Zhen Wei
- College of Aerospace Engineering, Chongqing University, Chongqing 400045, China
| | - Fang Fang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China
| | - Jin-Song Guo
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China
| | - You-Peng Chen
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China
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Ito M, Sugai Y. Nanobubbles activate anaerobic growth and metabolism of Pseudomonas aeruginosa. Sci Rep 2021; 11:16858. [PMID: 34413439 PMCID: PMC8376943 DOI: 10.1038/s41598-021-96503-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 08/09/2021] [Indexed: 11/09/2022] Open
Abstract
The effect of nanobubbles on anaerobic growth and metabolism of Pseudomonas aeruginosa was investigated. P. aeruginosa grew earlier in the culture medium containing nanobubbles and the bacterial cell concentration in that culture medium was increased a few times higher compared to the medium without nanobubbles under anaerobic condition. Both gas and protein, which are the metabolites of P. aeruginosa, were remarkably produced in the culture medium containing nanobubbles whereas those metabolites were little detected in the medium without nanobubbles, indicating nanobubbles activated anaerobic growth and metabolism of P. aeruginosa. The carbon dioxide nanobubbles came to be positively charged by adsorbing cations and delivered ferrous ions, one of the trace essential elements for bacterial growth, to the microbial cells, which activated the growth and metabolism of P. aeruginosa. The oxygen nanobubbles activated the activities of P. aeruginosa as an oxygen source.
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Affiliation(s)
- Miu Ito
- Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University, 744, Motooka, Nishiku, Fukuoka, 8190395, Japan
| | - Yuichi Sugai
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, 744, Motooka, Nishiku, Fukuoka, 8190395, Japan.
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Wu J, Zhang K, Cen C, Wu X, Mao R, Zheng Y. Role of bulk nanobubbles in removing organic pollutants in wastewater treatment. AMB Express 2021; 11:96. [PMID: 34184137 PMCID: PMC8239109 DOI: 10.1186/s13568-021-01254-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 06/15/2021] [Indexed: 02/06/2023] Open
Abstract
The occurrence of a variety of organic pollutants has complicated wastewater treatment; thus, the search for sustainable and effective treatment technology has drawn significant attention. In recent years, bulk nanobubbles, which have extraordinary properties differing from those of microbubbles, including high stability and long residence times in water, large specific surface areas, high gas transfer efficiency and interface potential, and the capability to generate free radicals, have shown attractive technological advantages and promising application prospects for wastewater treatment. In this review, the basic characteristics of bulk nanobubbles are summarized in detail, and recent findings related to their implementation pathways and mechanisms in organic wastewater treatment are systematically discussed, which includes improving the air flotation process, increasing water aeration to promote aerobic biological technologies including biological activated carbon, activated sludge, and membrane bioreactors, and generating active free radicals that oxidise organic compounds. Finally, the current technological difficulties of bulk nanobubbles are analysed, and future focus areas for research on bulk nanobubble technology are also proposed.
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Affiliation(s)
- Jiajia Wu
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058 China
| | - Kejia Zhang
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058 China
| | - Cheng Cen
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058 China
| | - Xiaogang Wu
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058 China
| | - Ruyin Mao
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058 China
| | - Yingying Zheng
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058 China
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