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Liu R, Li Z, Han G, Cun S, Hou D, Yu Z, Xue K, Liu X. Microbial density-dependent viral dynamics and low activity of temperate phages in the activated sludge process. WATER RESEARCH 2023; 232:119709. [PMID: 36764107 DOI: 10.1016/j.watres.2023.119709] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 01/31/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
The ecological behavior of bacteriophages (phages), the most abundant biological entity in wastewater treatment systems, is poorly understood, especially that of temperate phages. Here, the temporal dynamics of lytic and temperate phages in a laboratory-scale activated sludge reactor with a sludge bulking issue was investigated using coupled sludge metagenomic and viromic analyses. The lysogenic fragments (prophages) identified were widely distributed in the reconstructed metagenome-assembled genomes (61.7%, n = 227). However, only 12.3% of the identified prophages experienced lysogenic-lytic switching, and the abundance contribution of prophages to free virus communities was only 0.02-0.3%, indicating low activity of temperate phages. Although the sludge community changed dramatically during reactor operation, no massive prophage induction events were detected. Statistical analyses showed strong correlations between sludge concentration and free virus and temperate phage communities, suggesting microbial density-dependent virus dynamics in the sludge microbiota.
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Affiliation(s)
- Ruyin Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China; Binzhou Institute of Technology, Weiqiao-UCAS Science and Technology Park, Binzhou City, Shandong Province, China.
| | - Zong Li
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Ganghua Han
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Shujuan Cun
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Deyin Hou
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
| | - Zhisheng Yu
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Kai Xue
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Xinchun Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, China.
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2
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Li Z, Cun S, Han G, Guo X, Liu B, Huang T, Hou D, Liu R, Liu X. New insight into soluble extracellular metabolites during sludge bulking process based on excitation-emission matrix spectroscopy and ultrahigh-performance liquid chromatography-mass spectrometry. ENVIRONMENTAL RESEARCH 2023; 219:115161. [PMID: 36580981 DOI: 10.1016/j.envres.2022.115161] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 12/22/2022] [Accepted: 12/24/2022] [Indexed: 06/17/2023]
Abstract
Soluble extracellular metabolites (SEM) produced by microorganisms might significantly change during sludge bulking, which is a major operational problem caused by the excessive growth of filamentous bacteria. However, knowledge remains limited about the dynamics and potential role of SEM in the bulking of sludge. In this study, filamentous bulking was simulated in a laboratory-scale reactor and changes to SEM characteristics during the bulking process were investigated using excitation-emission matrix spectroscopy and ultrahigh-performance liquid chromatography-mass spectrometry. SEM components changed significantly at different phases of sludge bulking. Changes in SEM were closely correlated with the structure of the bacterial community. Based on the EEM profiles, significant increases in fulvic acid-like and humic acid-like substances in SEM were observed with the development of filamentous bulking. The degree of humification in SEM showed a clear increasing trend. Untargeted extracellular metabolomic analysis showed that the intensity of berberine and isorhamnetin in SEM increased significantly during the bulking phase, which might synergistically facilitate the development of filamentous bulking.
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Affiliation(s)
- Zong Li
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Shujuan Cun
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Ganghua Han
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Xiaoxiao Guo
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Bingxin Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Ting Huang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China
| | - Deyin Hou
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
| | - Ruyin Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; RCEES-IMCAS-UCAS Joint-Lab of Microbial Technology for Environmental Science, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China.
| | - Xinchun Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, University of Chinese Academy of Sciences, Beijing, China.
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Xu B, Albert Ng TC, Huang S, Shi X, Ng HY. Feasibility of isolated novel facultative quorum quenching consortiums for fouling control in an AnMBR. WATER RESEARCH 2020; 114:151-180. [PMID: 31706123 DOI: 10.1016/j.watres.2017.02.006] [Citation(s) in RCA: 485] [Impact Index Per Article: 121.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 01/10/2017] [Accepted: 02/02/2017] [Indexed: 05/06/2023]
Abstract
Anaerobic membrane bioreactor (AnMBR) technology is being recognized as an appealing strategy for wastewater treatment, however, severity of membrane fouling inhibits its widespread implementations. This study engineered novel facultative quorum quenching consortiums (FQQs) coping with membrane fouling in AnMBRs with preliminary analysis for their quorum quenching (QQ) performances. Herein, Acyl-homoserine lactones (AHLs)-based quorum sensing (QS) in a lab-scale AnMBR initially revealed that N-Hexanoyl-dl-homoserine lactone (C6-HSL), N-Octanoyl-dl-homoserine lactone (C8-HSL) and N-Decanoyl-dl-homoserine lactone (C10-HSL) were the dominant AHLs in AnMBRs in this study. Three FQQs, namely, FQQ-C6, FQQ-C8 and FQQ-C10, were harvested after anaerobic screening of aerobic QQ consortiums (AeQQs) which were isolated by enrichment culture, aiming to degrade C6-HSL, C8-HSL and C10-HSL, respectively. Growth of FQQ-C6 and FQQ-C10 using AHLs as carbon source under anaerobic condition was significantly faster than those using acetate, congruously suggesting that their QQ performance will not be compromised in AnMBRs. All FQQs degraded a wide range of AHLs pinpointing their extensive QQ ability. FQQ-C6, FQQ-C8 and FQQ-C10 remarkably alleviated extracellular polymeric substances (EPS) production in a lab-scale AnMBR by 72.46%, 35.89% and 65.88%, respectively, and FQQ-C6 retarded membrane fouling of the AnMBR by 2 times. Bioinformatics analysis indicated that there was a major shift in dominant species from AeQQs to FQQs where Comamonas sp., Klebsiella sp., Stenotrophomonas sp. and Ochrobactrum sp. survived after anaerobic screening and were the majority in FQQs. High growth rate utilizing AHLs under anaerobic condition and enormous EPS retardation efficiency in FQQ-C6 and FQQ-C10 could be attributed to Comamonas sp.. These findings demonstrated that FQQs could be leveraged for QQ under anaerobic systems. We believe that this was the first work proposing a bacterial pool of facultative QQ candidates holding biotechnological promises for membrane fouling control in AnMBRs.
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Affiliation(s)
- Boyan Xu
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576
| | - Tze Chiang Albert Ng
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576
| | - Shujuan Huang
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576
| | - Xueqing Shi
- School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao, 266033, PR China
| | - How Yong Ng
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576; National University of Singapore Environmental Research Institute, 5A Engineering Drive 1, 117411, Singapore.
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Liu Z, Zhu X, Liang P, Zhang X, Kimura K, Huang X. Distinction between polymeric and ceramic membrane in AnMBR treating municipal wastewater: In terms of irremovable fouling. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.117229] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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5
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Hamedi H, Ehteshami M, Mirbagheri SA, Rasouli SA, Zendehboudi S. Current Status and Future Prospects of Membrane Bioreactors (MBRs) and Fouling Phenomena: A Systematic Review. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23345] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hamideh Hamedi
- Department of Civil EngineeringK. N. Toosi University of TechnologyTehranIran
- Faculty of Engineering and Applied ScienceMemorial UniversitySt. John'sNLCanada
| | - Majid Ehteshami
- Department of Civil EngineeringK. N. Toosi University of TechnologyTehranIran
| | | | - Seyed Abbas Rasouli
- Faculty of Engineering and Applied ScienceMemorial UniversitySt. John'sNLCanada
| | - Sohrab Zendehboudi
- Faculty of Engineering and Applied ScienceMemorial UniversitySt. John'sNLCanada
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Cerón-Vivas A, Kalboussi N, Morgan-Sagastume JM, Harmand J, Noyola A. Model assessment of the prevailing fouling mechanisms in a submerged membrane anaerobic reactor treating low-strength wastewater. BIORESOURCE TECHNOLOGY 2018; 268:460-469. [PMID: 30107360 DOI: 10.1016/j.biortech.2018.08.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 08/03/2018] [Accepted: 08/05/2018] [Indexed: 06/08/2023]
Abstract
Three models (blocking laws, combined and resistance-in-series) were applied to identify the prevailing fouling mechanisms in a submerged membrane in an up-flow anaerobic sludge blanket reactor treating municipal wastewater. Experimental runs were carried out at lab-scale with filtration periods of 4 and 10 min, followed by relaxation periods of one minute with and without nitrogen bubbling. In all conditions excepting one (IF4R), the blocking laws model showed a predominance of cake formation. With the combined model, cake formation coupled with intermediate, standard and complete fouling had the better fits in all conditions, excepting IF4 and IF4R. When sewage was fed, both models pointed at intermediate fouling in the absence of gas bubbling. The resistance-in-series model identified the positive effect of gas bubbling and a post-cake fouling behavior, not shown by the other two models. This modeling approach could be applied for achieving longer filtration runs in submerged UF membranes.
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Affiliation(s)
- Alexandra Cerón-Vivas
- Facultad de Ingeniería Ambiental, Universidad Pontificia Bolivariana, Km. 7 vía a Piedecuesta, Floridablanca, Colombia.
| | - Nesrine Kalboussi
- Université de Tunis El Manar, Ecole Nationale d'Ingénieurs de Tunis, Laboratoire de Modélisation Mathématique et Numérique dans les Sciences de l'Ingénieur (LAMSIN), Tunis, Tunisia; LBE, Univ Montpellier, INRA, Narbonne, France
| | | | | | - Adalberto Noyola
- Instituto de Ingeniería, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, Mexico
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7
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Fabrication and in-situ fouling mitigation of a supported carbon nanotube/γ-alumina ultrafiltration membrane. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.12.050] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Wu Q, Yan X, Xiao K, Guan J, Li T, Liang P, Huang X. Optimization of membrane unit location in a full-scale membrane bioreactor using computational fluid dynamics. BIORESOURCE TECHNOLOGY 2018; 249:402-409. [PMID: 29059623 DOI: 10.1016/j.biortech.2017.09.209] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/29/2017] [Accepted: 09/30/2017] [Indexed: 06/07/2023]
Abstract
The location of membrane units in the membrane tank is a key factor in the construction of a full-scale membrane bioreactor (MBR), as it would greatly affect the hydrodynamics in the tank, which could in turn affect the membrane fouling rate while running. Yet, in most cases, these units were empirically installed in tanks, no theory guides were currently available for the design of a proper location. In this study, the hydrodynamics in the membrane tank of a full-scale MBR was simulated using computational fluid dynamics (CFD). Five indexes (iLu, iLa, iLb, iLint, iLw) were used to indicate the unit location, and each of them was discussed for their individual impact on the risk water velocity (v0.05) in the membrane unit region. An optimal design with all the indexes equaling 0.6 was proposed, and was found to have a promotion of 146.9% for v0.05.
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Affiliation(s)
- Qing Wu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, THU-Beijing Origin Water Joint Research Center for Environmental Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xiaoxu Yan
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, THU-Beijing Origin Water Joint Research Center for Environmental Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China
| | - Kang Xiao
- College of Resource and Environment, University of Chinese Academy of Science, Beijing 100049, China
| | - Jing Guan
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, THU-Beijing Origin Water Joint Research Center for Environmental Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China
| | - Tianyu Li
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, THU-Beijing Origin Water Joint Research Center for Environmental Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China
| | - Peng Liang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, THU-Beijing Origin Water Joint Research Center for Environmental Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xia Huang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, THU-Beijing Origin Water Joint Research Center for Environmental Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China.
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9
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Zamani F, Ma A, Han Q, Ma Q, Zhang H, Fane AG, Chew JW. An energy-efficient method for mitigating membrane fouling: A novel embodiment of the inverse fluidized bed. SEP SCI TECHNOL 2017. [DOI: 10.1080/01496395.2017.1399909] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Farhad Zamani
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
| | - Aijing Ma
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
| | - Qi Han
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
| | - Qinglang Ma
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
- Center for Programmable Materials, School of Material Science and Engineering, Nanyang Technological University, Singapore
| | - Hua Zhang
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
- Center for Programmable Materials, School of Material Science and Engineering, Nanyang Technological University, Singapore
| | - Anthony G. Fane
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
| | - Jia Wei Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
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Tang X, Ding A, Qu F, Jia R, Chang H, Cheng X, Liu B, Li G, Liang H. Effect of operation parameters on the flux stabilization of gravity-driven membrane (GDM) filtration system for decentralized water supply. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:16771-16780. [PMID: 27189452 DOI: 10.1007/s11356-016-6857-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Accepted: 05/09/2016] [Indexed: 06/05/2023]
Abstract
A pilot-scale gravity-driven membrane (GDM) filtration system under low gravitational pressure without any pre-treatment, backwash, flushing, or chemical cleaning was carried out to investigate the effect of operation parameters (including operation pressure, aeration mode, and intermittent filtration) on the effluent quality and permeability development. The results revealed that GDM system exhibited an efficient performance for the removal of suspended substances and organic compounds. The stabilization of flux occurred and the average values of stable flux were 6.6, 8.1, and 8.6 Lm(-2) h(-1) for pressures of 65, 120, and 200 mbar, respectively. In contrast, flux stabilization was not observed under continuous and intermittent aeration conditions. However, aeration (especially continuous aeration) was effective to improve flux and alleviate membrane fouling during 1-month operation. Moreover, intermittent filtration would influence the stabilization of permeate flux, resulting in a higher stable flux (ranging from 6 to 13 Lm(-2) h(-1)). The stable flux significantly improved with the increase of intermittent period. Additionally, GDM systems exhibited an efficient recovery of flux after simple physical cleaning and the analyses of resistance reversibility demonstrated that most of the total resistance was hydraulic reversible resistance (50-75 %). Therefore, it is expected that the results of this study can develop strategies to increase membrane permeability and reduce energy consumption in GDM systems for decentralized water supply.
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Affiliation(s)
- Xiaobin Tang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - An Ding
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Fangshu Qu
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Ruibao Jia
- Jinan Water and Wastewater Monitoring Center, No. 68 Weiwu Road, Shizhong District, Jinan, 250021, China
| | - Haiqing Chang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Xiaoxiang Cheng
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Bin Liu
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Guibai Li
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Heng Liang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China.
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11
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Wang YK, Pan XR, Sheng GP, Li WW, Shi BJ, Yu HQ. Development of an energy-saving anaerobic hybrid membrane bioreactors for 2-chlorophenol-contained wastewater treatment. CHEMOSPHERE 2015; 140:79-84. [PMID: 24880609 DOI: 10.1016/j.chemosphere.2014.04.101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 03/29/2014] [Accepted: 04/28/2014] [Indexed: 06/03/2023]
Abstract
A novel energy-saving anaerobic hybrid membrane bioreactor (AnHMBR) with mesh filter, which takes advantage of anaerobic membrane bioreactor and fixed-bed biofilm reactor, is developed for low-strength 2-chlorophenol (2-CP)-contained wastewater treatment. In this system, the anaerobic membrane bioreactor is stuffed with granular activated carbon to construct an anaerobic hybrid fixed-bed biofilm membrane bioreactor. The effluent turbidity from the AnHMBR system was low during most of the operation period, and the chemical oxygen demand and 2-CP removal efficiencies averaged 82.3% and 92.6%, respectively. Furthermore, a low membrane fouling rate was achieved during the operation. During the AnHMBR operation, the only energy consumption was for feed pump. And a low energy demand of 0.0045-0.0063kWhm(-3) was estimated under the current operation conditions. All these results demonstrated that this novel AnHMBR is a sustainable technology for treating 2-CP-contained wastewater.
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Affiliation(s)
- Yun-Kun Wang
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Xin-Rong Pan
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Guo-Ping Sheng
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
| | - Wen-Wei Li
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Bing-Jing Shi
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Han-Qing Yu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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12
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Yu W, Graham N, Yang Y, Zhou Z, Campos LC. Effect of sludge retention on UF membrane fouling: The significance of sludge crystallization and EPS increase. WATER RESEARCH 2015; 83:319-328. [PMID: 26179638 DOI: 10.1016/j.watres.2015.06.049] [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: 02/07/2015] [Revised: 06/22/2015] [Accepted: 06/29/2015] [Indexed: 06/04/2023]
Abstract
This paper concerns a previously unreported mechanism of membrane ultrafiltration (UF) fouling when a UF process with coagulation pre-treatment is used in drinking water treatment. The significance of settled coagulant solids (sludge) with different age within the membrane tank on UF fouling has been investigated at laboratory-scale, using model micro-polluted surface water. The process of floc crystallization and increasing bacterial EPS with solids (sludge) retention time may be detrimental to UF operation by causing an increased rate of membrane fouling. In this study the performance of two alum pre-treated hollow-fibre UF units, operated in parallel but with different settled sludge retention times (1 and 7 days), was compared. The results showed that over 34 days of operation the extent of reversible and irreversible fouling was much greater for the 7-day solids retention time. This was attributed to the greater extent of bacterial activity and the presence of Al-nanoparticles, arising from sludge crystallization, at the longer retention time. In particular, greater quantities of organic matter, particularly EPS (proteins and polysaccharides), were found in the UF cake layer and pores for the 7-day retention time. The addition of chlorine later in the membrane run substantially reduced the rate of membrane fouling for both sludge retention times, and this corresponded to reduced quantities of organic substances, including EPS, in the cake layer and pores of both membranes. The results suggest that bacterial activity (and EPS production) is more important than the production of Al-nanoparticles from solids crystallization in causing membrane fouling. However, it is likely that both phenomena are interactive and possibly synergistic.
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Affiliation(s)
- Wenzheng Yu
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
| | - Nigel Graham
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
| | - Yunjia Yang
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
| | - Zhiqi Zhou
- Department of Civil, Environmental and Geomatic Engineering, University College London, Gower Street, London WC1E 6BT, UK.
| | - Luiza C Campos
- Department of Civil, Environmental and Geomatic Engineering, University College London, Gower Street, London WC1E 6BT, UK.
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13
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Yu W, Graham NJ. Performance of an integrated granular media – Ultrafiltration membrane process for drinking water treatment. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.05.032] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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