1
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Mannina G, Ni BJ, Makinia J, Harmand J, Alliet M, Brepols C, Ruano MV, Robles A, Heran M, Gulhan H, Rodriguez-Roda I, Comas J. Biological processes modelling for MBR systems: A review of the state-of-the-art focusing on SMP and EPS. WATER RESEARCH 2023; 242:120275. [PMID: 37413746 DOI: 10.1016/j.watres.2023.120275] [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: 05/17/2023] [Revised: 06/25/2023] [Accepted: 06/26/2023] [Indexed: 07/08/2023]
Abstract
A mathematical correlation between biomass kinetic and membrane fouling can improve the understanding and spread of Membrane Bioreactor (MBR) technology, especially in solving the membrane fouling issues. On this behalf, this paper, produced by the International Water Association (IWA) Task Group on Membrane modelling and control, reviews the current state-of-the-art regarding the modelling of kinetic processes of biomass, focusing on modelling production and utilization of soluble microbial products (SMP) and extracellular polymeric substances (EPS). The key findings of this work show that the new conceptual approaches focus on the role of different bacterial groups in the formation and degradation of SMP/EPS. Even though several studies have been published regarding SMP modelling, there still needs to be more information due to the highly complicated SMP nature to facilitate the accurate modelling of membrane fouling. The EPS group has seldom been addressed in the literature, probably due to the knowledge deficiency concerning the triggers for production and degradation pathways in MBR systems, which require further efforts. Finally, the successful model applications showed that proper estimation of SMP and EPS by modelling approaches could optimise membrane fouling, which can influence the MBR energy consumption, operating costs, and greenhouse gas emissions.
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Affiliation(s)
- Giorgio Mannina
- Engineering Department, Palermo University, Viale delle Scienze, Ed.8, 90128 Palermo, Italy.
| | - Bing-Jie Ni
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, New South Wales 2007, Australia
| | - Jacek Makinia
- Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland
| | | | - Marion Alliet
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
| | - Christoph Brepols
- Erftverband, Wastewater Department, Am Erftverband 6, 50126 Bergheim, Germany
| | - M Victoria Ruano
- Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyeria (ETSE-UV), Universitat de València, Avinguda de la Universitat s/n, 46100 Burjassot, València, Spain
| | - Angel Robles
- Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyeria (ETSE-UV), Universitat de València, Avinguda de la Universitat s/n, 46100 Burjassot, València, Spain
| | - Marc Heran
- Institut Européen des Membranes, IEM, Univ Montpellier, CNRS, ENSCM, Montpellier, France
| | - Hazal Gulhan
- Engineering Department, Palermo University, Viale delle Scienze, Ed.8, 90128 Palermo, Italy; Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, Ayazaga Campus, Maslak, 34469 Istanbul, Turkey
| | - Ignasi Rodriguez-Roda
- LEQUiA, Laboratory of Chemical and Environmental Engineering, University of Girona, Campus Montilivi, 17071 Girona, Spain
| | - Joaquim Comas
- LEQUiA, Laboratory of Chemical and Environmental Engineering, University of Girona, Campus Montilivi, 17071 Girona, Spain; Catalan Institute for Water Research (ICRA), Emili Grahit 101, 17003 Girona, Spain
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Nabi M, Gao D, Liang H, Cheng L, Yang W, Li Y. Landfill leachate treatment by graphite engineered anaerobic membrane bioreactor: Performance enhancement and membrane fouling mitigation. ENVIRONMENTAL RESEARCH 2022; 214:114010. [PMID: 35921906 DOI: 10.1016/j.envres.2022.114010] [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: 06/11/2022] [Revised: 07/20/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Low efficiency of anaerobic digestion and membrane fouling, treating landfill leachate, are big barriers in the application of anaerobic membrane bioreactor (AnMBR). Anaerobic digestion enhancement and membrane fouling mitigation of AnMBR with graphite addition, treating landfill leachate, were investigated in this study. The effect of graphite on organics removal, biogas production, methane content in biogas, membrane fouling, microbial responses and foulant compositions were analyzed. With the graphite addition, chemical oxygen demand (COD) removal of 78% was achieved for influent COD concentration of 3000 mg/l, which was significantly higher than the stage without graphite addition (65%) for influent COD concentration of 2000 mg/l. Similarly, methane content in biogas with graphite addition was 56%, while without graphite addition it was 46%. These digestion improvements were due to the promotion of organics degradation, facilitated by direct interspecies electron transfer (DIET) mechanism via graphite addition in AnMBR. The graphite addition prolonged membrane cleaning cycle from 13 days to 30 days. Protein content in loosely bound extracellular polymeric substance (LB-EPS) was the main fouling agent, which decreased with the graphite addition. The main mechanism behind membrane fouling mitigation was the protein content reduction in LB-EPS, which was biodegraded by Trichococcus being increased in relative abundance with the graphite addition. Furthermore, abundance of Denitratisoma decreased in anaerobic sludge and its accumulation reduced on membrane surface, subsequently membrane fouling was mitigated. Overall, graphite addition in AnMBR is a potential eco-innovative approach that efficiently removes pollutants from landfill leachate, enhances biogas quality and mitigates membrane fouling.
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Affiliation(s)
- Mohammad Nabi
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Dawen Gao
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.
| | - Hong Liang
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Lang Cheng
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Wenbo Yang
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
| | - Yuqi Li
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
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3
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Tuck B, Salgar-Chaparro SJ, Watkin E, Somers A, Forsyth M, Machuca LL. Extracellular DNA: A Critical Aspect of Marine Biofilms. Microorganisms 2022; 10:microorganisms10071285. [PMID: 35889003 PMCID: PMC9320517 DOI: 10.3390/microorganisms10071285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/21/2022] [Accepted: 06/21/2022] [Indexed: 02/05/2023] Open
Abstract
Multispecies biofilms represent a pervasive threat to marine-based industry, resulting in USD billions in annual losses through biofouling and microbiologically influenced corrosion (MIC). Biocides, the primary line of defence against marine biofilms, now face efficacy and toxicity challenges as chemical tolerance by microorganisms increases. A lack of fundamental understanding of species and EPS composition in marine biofilms remains a bottleneck for the development of effective, target-specific biocides with lower environmental impact. In the present study, marine biofilms are developed on steel with three bacterial isolates to evaluate the composition of the EPSs (extracellular polymeric substances) and population dynamics. Confocal laser scanning microscopy, scanning electron microscopy, and fluorimetry revealed that extracellular DNA (eDNA) was a critical structural component of the biofilms. Parallel population analysis indicated that all three strains were active members of the biofilm community. However, eDNA composition did not correlate with strain abundance or activity. The results of the EPS composition analysis and population analysis reveal that biofilms in marine conditions can be stable, well-defined communities, with enabling populations that shape the EPSs. Under marine conditions, eDNA is a critical EPS component of the biofilm and represents a promising target for the enhancement of biocide specificity against these populations.
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Affiliation(s)
- Benjamin Tuck
- Curtin Corrosion Centre, WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Kent Street, Bentley, WA 6102, Australia; (B.T.); (S.J.S.-C.)
| | - Silvia J. Salgar-Chaparro
- Curtin Corrosion Centre, WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Kent Street, Bentley, WA 6102, Australia; (B.T.); (S.J.S.-C.)
| | - Elizabeth Watkin
- Curtin Medical School, Curtin University, Kent Street, Bentley, WA 6102, Australia;
| | - Anthony Somers
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3217, Australia; (A.S.); (M.F.)
| | - Maria Forsyth
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3217, Australia; (A.S.); (M.F.)
| | - Laura L. Machuca
- Curtin Corrosion Centre, WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Kent Street, Bentley, WA 6102, Australia; (B.T.); (S.J.S.-C.)
- Correspondence:
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4
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Self-potent anti-microbial and anti-fouling action of silver nanoparticles derived from lichen-associated bacteria. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02501-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Jiang C, Tang X, Feng F, Zhao J, Liu Z, Qu C, Adhikary KK, Wu D, Tang CJ. Distinct membrane fouling characteristics of anammox MBR with low NO 2--N/NH 4+-N ratio. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 817:152994. [PMID: 35016942 DOI: 10.1016/j.scitotenv.2022.152994] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/05/2022] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
The bacterial growth and death, and extracellular polymeric substances (EPS) and soluble microbial products (SMP) in aerobic membrane bioreactor (MBR) cause severe membrane fouling. Anammox bacteria grow slowly but produce much EPS and SMP. Therefore, the membrane fouling characteristic of anammox MBR is still indistinct. A NO2--N/NH4+-N < 1.0 into in the influent of an anammox MBR applies to investigate: 1) the slowest growing anammox bacteria (Candidatus Jettenia) could be enriched or not; 2) its membrane fouling characteristic. Results showed that Candidatus Jettenia successfully accumulated from 0.01% to 26.19%. The fouling characteristic of anammox MBR was entirely different from other MBRs. Firstly, obvious low transmembrane pressure (<4 KPa, 125 days) and low amount of foulants (0.22 gVSS/m2) might result from N2 production and the slow-growing Candidatus Jettenia. Secondly, the analysis of the components of membrane foulants indicated that polysaccharides of SMP in the gel layer and pore foulants were the key factors affecting membrane fouling. Finally, the large particle size of foulants (200 μm) might be caused by anammox bacteria living inside the foulants under anaerobic conditions. This study provides systematic insights into membrane characteristics of anammox MBR and a basis for the enrichment of anammox bacteria by MBR.
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Affiliation(s)
- Chukuan Jiang
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China
| | - Xi Tang
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China
| | - Fan Feng
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China
| | - Jiangwei Zhao
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China
| | - Zhigong Liu
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China
| | - Caiyan Qu
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China
| | - Keshab K Adhikary
- Ghent University Global Campus, Ghent University, Incheon, Republic of Korea
| | - Di Wu
- Ghent University Global Campus, Ghent University, Incheon, Republic of Korea
| | - Chong-Jian Tang
- School of Metallurgy and Environment, National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha, Hunan 410083, China.
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6
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Teng J, Wu M, Chen J, Lin H, He Y. Different fouling propensities of loosely and tightly bound extracellular polymeric substances (EPSs) and the related fouling mechanisms in a membrane bioreactor. CHEMOSPHERE 2020; 255:126953. [PMID: 32402884 DOI: 10.1016/j.chemosphere.2020.126953] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 04/23/2020] [Accepted: 04/30/2020] [Indexed: 05/26/2023]
Abstract
In this study, fouling propensities of loosely bound extracellular polymeric substances (LB-EPSs) and tightly bound EPSs (TB-EPSs) in a membrane bioreactor (MBR) were investigated. It was found that, both the LB-EPSs and TB-EPSs possessed rather high specific filtration resistance (SFR), and LB-EPSs possessed about three times higher SFR but a lower adhesion ability than the TB-EPSs. A series of characterizations demonstrated that LB-EPSs had higher ratio of proteins to polysaccharides (PN/PS ratio), lower CO bonds content, higher hydrophilicity, higher deformation or mixing ability and more abundant high molecular weight (MW) substances than TB-EPSs. Thermodynamic analyzes revealed that the total interaction energy between the TB-EPSs and membrane was always attractive and strengthened, well explaining the higher adhesion ability of the TB-EPSs than the LB-EPSs. Meanwhile, the filtration process was found to be associated with gel layer formation, and the high SFR of EPSs was caused by the chemical potential change in gel layer filtration. According to the Flory-Huggins lattice theory, LB-EPSs tended to form a gel layer with higher cross-linking and/or polymer entanglement level because they contained more abundant high molecular weight (MW) substance, corresponding to higher SFR than that of the TB-EPSs. The proposed thermodynamic mechanisms well interpreted the different fouling propensities of LB-EPSs and TB-EPSs in MBRs.
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Affiliation(s)
- Jiaheng Teng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Mengfei Wu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Jianrong Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Yiming He
- Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua, 321004, China
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7
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Jiang B, Zeng Q, Liu J, Hou Y, Xu J, Li H, Shi S, Ma F. Enhanced treatment performance of phenol wastewater and membrane antifouling by biochar-assisted EMBR. BIORESOURCE TECHNOLOGY 2020; 306:123147. [PMID: 32171174 DOI: 10.1016/j.biortech.2020.123147] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/01/2020] [Accepted: 03/03/2020] [Indexed: 06/10/2023]
Abstract
Biochar-assisted EMBR (BC-assisted EMBR) was built to enhance treatment performance of phenol wastewater and membrane antifouling. BC-assisted EMBR significantly increased phenol degradation efficiency, owing to combined effects of biodegradation, adsorption and electro-catalytic degradation. Meanwhile, BC-assisted EMBR obviously mitigated membrane fouling. The coupling effect of BC and voltage led to the lower N-acyl-homoserine lactones (AHLs) and bound extracellular polymeric substances (bound EPS) contents around and on membrane surface. Protein (PN)/polysaccharide (PS) in bound EPS was decreased, led to the increase of negative charge and decrease of hydrophobicity of sludge, which abated bound EPS adsorption on membrane surface. Microbial community analyses revealed that the coupling effect of BC and voltage could enrich phenol-degraders (e.g., Comamonas), electron transfer genus (Phaselicystis), and biopolymer-degraders (Phaselicystis and Tepidisphaera) in BC-assisted EMBR and on its membrane surface, while decrease biofilm-former (e.g., Acinetobacter) and bound EPS-producer (Devosia), which was beneficial to promote phenol treatment and mitigate membrane fouling.
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Affiliation(s)
- Bei Jiang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China
| | - Qianzhi Zeng
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Jiaxin Liu
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Yuan Hou
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Jin Xu
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Hongxin Li
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Shengnan Shi
- School of Life Science, Liaoning Normal University, Dalian 116081, China.
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
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Jiang B, Zeng Q, Hou Y, Li H, Liu J, Xu J, Shi S, Ma F. Impacts of long-term electric field applied on the membrane fouling mitigation and shifts of microbial communities in EMBR for treating phenol wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 716:137139. [PMID: 32045761 DOI: 10.1016/j.scitotenv.2020.137139] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 01/15/2020] [Accepted: 02/04/2020] [Indexed: 06/10/2023]
Abstract
The membrane antifouling and shifts of microbial communities of long-term electric field applied in MBR (EMBR) for treating phenol wastewater was systematically investigated. The increased voltage increased the phenol degradation rate and slowed down the TMP increase rate in EMBR (G1-G4: 1.65 × 10-3-8.40 × 10-4 Mpa/d), indicated the enhancement of phenol treatment and mitigation of membrane fouling. Decrease of protein (PN)/polysaccharide (PS) in EPS increased the negative charge and decreased the hydrophobicity of sludge, thus abated its adsorption on membrane surface. The decrease of AHLs concentration attributed to the electrolysis of AHLs by the electro-generated H2O2. Besides, the AHLs had significantly negative correlation with QQ bacteria Rhodococcus and Stenotrophomonas enrichment and positive correlation with QS bacteria Aeromonas decrease in EMBRs, suggesting that coupling effects of voltage and QQ bacteria degraded AHLs, thus decreased EPS content which was positively correlated with AHLs concentration. Biopolymer-degrading genera (Clostridium sensu strict etc.) increased in EMBR and on membrane surface, while biofilm-forming genera (Pseudomonas etc.) decreased on membrane surface. These resulted in EPS content decrease and membrane antifouling.
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Affiliation(s)
- Bei Jiang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China
| | - Qianzhi Zeng
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Yuan Hou
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Hongxin Li
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Jiaxin Liu
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Jin Xu
- School of Life Science, Liaoning Normal University, Dalian 116081, China
| | - Shengnan Shi
- School of Life Science, Liaoning Normal University, Dalian 116081, China.
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
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Chen L, Cheng P, Ye L, Chen H, Xu X, Zhu L. Biological performance and fouling mitigation in the biochar-amended anaerobic membrane bioreactor (AnMBR) treating pharmaceutical wastewater. BIORESOURCE TECHNOLOGY 2020; 302:122805. [PMID: 32007847 DOI: 10.1016/j.biortech.2020.122805] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 06/10/2023]
Abstract
Anaerobic membrane bioreactor (AnMBR) is an advanced technology in treating pharmaceutical wastewater, but the membrane fouling limits its development. In this study, the biochar with adsorption capacity of biopolymers was added in AnMBR to investigate its potential in treating pharmaceutical wastewater and alleviating membrane fouling. In the biochar-amended AnMBR, adsorbable organic halogen (AOX) was removed effectively, and more COD was biotransformed into CH4. Membrane fouling mitigation was achieved in the third stage with a 56% decrease of average transmembrane pressure difference (TMP) rising rate. The predominant culprit, proteins of extracellular polymeric substance (EPS-proteins) in sludge mixture and cake layer, was reduced significantly. Particularly, the proportion of micromolecular (0.1-0.15 kDa) EPS-proteins in cake layer was 1.5-folds that of the control group. The important bio-foulant genus Arcobacter aggregating on the membrane had less and almost half the relative abundance (16.5%) than that of the control group (30.7%).
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Affiliation(s)
- Linlin Chen
- Institution of Environment Pollution Control and Treatment, Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Peijin Cheng
- Institution of Environment Pollution Control and Treatment, Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Lu Ye
- Institution of Environment Pollution Control and Treatment, Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Hui Chen
- Department of Environmental Engineering, Taizhou University, Taizhou, Zhejiang 318000, China
| | - Xiangyang Xu
- Institution of Environment Pollution Control and Treatment, Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, 388 Yuhangtang Road, Hangzhou 310058, China
| | - Liang Zhu
- Institution of Environment Pollution Control and Treatment, Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, 388 Yuhangtang Road, Hangzhou 310058, China.
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10
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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: 478] [Impact Index Per Article: 119.5] [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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Cruz-Silva R, Takizawa Y, Nakaruk A, Katouda M, Yamanaka A, Ortiz-Medina J, Morelos-Gomez A, Tejima S, Obata M, Takeuchi K, Noguchi T, Hayashi T, Terrones M, Endo M. New Insights in the Natural Organic Matter Fouling Mechanism of Polyamide and Nanocomposite Multiwalled Carbon Nanotubes-Polyamide Membranes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:6255-6263. [PMID: 31074970 DOI: 10.1021/acs.est.8b07203] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Polyamide (PA) membranes comprise most of the reverse osmosis membranes currently used for desalination and water purification. However, their fouling mechanisms with natural organic matter (NOM) is still not completely understood. In this work, we studied three different types of PA membranes: a laboratory made PA, a commercial PA, and a multiwalled carbon nanotube (CNT-PA nanocomposite membrane during cross-flow measurements by NaCl solutions including NOM, humic acid (HA), or alginate, respectively). Molecular dynamic simulations were also used to understand the fouling process of NOM down to its molecular scale. Low molecular weight humic acid binds to the surface cavities on the PA structures that leads to irreversible adsorption induced by the high surface roughness. In addition, the larger alginate molecules show a different mechanism, due to their larger size and their ability to change shape from the globule type to the uncoiled state. Specifically, alginate molecules either bind through Ca2+ bridges or they uncoil and spread on the surface. This work shows that carbon nanotubes can help to decrease roughness and polymer mobility on the surfaces of the membranes at the molecular scale, which represents a novel method to design antifouling membranes.
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Affiliation(s)
- Rodolfo Cruz-Silva
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Yoshihiro Takizawa
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Auppatham Nakaruk
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Michio Katouda
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Research Organization for Information Science & Technology , 2-32-3, Kitashinagawa , Shinagawa-ku , Tokyo 140-0001 , Japan
| | - Ayaka Yamanaka
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Research Organization for Information Science & Technology , 2-32-3, Kitashinagawa , Shinagawa-ku , Tokyo 140-0001 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Josue Ortiz-Medina
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Aaron Morelos-Gomez
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Syogo Tejima
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Research Organization for Information Science & Technology , 2-32-3, Kitashinagawa , Shinagawa-ku , Tokyo 140-0001 , Japan
| | - Michiko Obata
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Kenji Takeuchi
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Toru Noguchi
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Takuya Hayashi
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Mauricio Terrones
- Department of Physics, Department of Materials Science and Engineering, and Department of Chemistry . The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
| | - Morinobu Endo
- Global Aqua Innovation Center , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
- Institute of Carbon Science and Technology , Shinshu University , 4-17-1 Wakasato , Nagano 380-8553 , Japan
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12
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Mannina G, Capodici M, Cosenza A, Di Trapani D, Viviani G. The influence of solid retention time on IFAS-MBR systems: analysis of system behavior. ENVIRONMENTAL TECHNOLOGY 2019; 40:1840-1852. [PMID: 29350114 DOI: 10.1080/09593330.2018.1430855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 01/15/2018] [Indexed: 06/07/2023]
Abstract
A University of Cape Town Integrated Fixed-Film Activated Sludge Membrane Bioreactor (UCT-IFAS-MBR) pilot plant was operated at different values of the sludge retention time (SRT). Three SRTs were investigated at different durations: indefinitely, 30 and 15 days. The organic carbon, nitrogen and phosphorus removal, kinetic/stoichiometric parameters, membrane fouling tendency and sludge filtration properties were assessed. The findings showed that by decreasing the SRT, the pilot plant could maintain excellent carbon removal efficiencies throughout the experiments. In contrast, the biological carbon removal showed a slight nitrification and was slightly affected by the decrease of the SRT, showing high performance (approximately 91%, on average). Thus, the biofilm might have helped sustain the nitrification throughout the experiments. The average phosphorus removal performance increased slightly with a decrease in SRT, achieving the maximum efficiency (61.5%) at a SRT of 15 days. After a 30-day SRT, an increase in resistance due to pore blocking and a general worsening of the membrane filtration properties occurred.
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Affiliation(s)
- Giorgio Mannina
- a Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali , Università di Palermo , Palermo , Italy
| | - Marco Capodici
- a Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali , Università di Palermo , Palermo , Italy
| | - Alida Cosenza
- a Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali , Università di Palermo , Palermo , Italy
| | - Daniele Di Trapani
- a Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali , Università di Palermo , Palermo , Italy
| | - Gaspare Viviani
- a Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali , Università di Palermo , Palermo , Italy
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13
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Cheng H, Hiro Y, Hojo T, Li YY. Upgrading methane fermentation of food waste by using a hollow fiber type anaerobic membrane bioreactor. BIORESOURCE TECHNOLOGY 2018; 267:386-394. [PMID: 30031277 DOI: 10.1016/j.biortech.2018.07.045] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/05/2018] [Accepted: 07/08/2018] [Indexed: 05/27/2023]
Abstract
In this study, the effects of organic loading rates (OLRs) on anaerobic fermentation of food waste were comprehensively evaluated using a hollow fiber type anaerobic membrane bioreactor (HF-AnMBR). Compared to other OLRs, biogas production rate was highest at the OLR of 9.72 g-COD/L/d, the organic matter removal efficiency was also significantly higher and VFA was in lower concentration. COD conversion efficiency was as high as 92.9%, 85.3%, 82.6% and 80.4% at OLRs of 2.43, 4.86, 7.29 and 9.72 g-COD/L/d, respectively. The major membrane fouling was caused by organic pore blocking, accounting for 59.6% of the total hydraulic resistance after long-term operation. The performance of HF-AnMBR was compared with a continuously stirred tank reactor (CSTR) and a self-agitated reactor (SAR). The higher operation OLRs, COD conversion efficiency and better effluent quality achieved by the HF-AnMBR are evidences of a significant improvement in reactor performance compared to CSTR and SAR.
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Affiliation(s)
- Hui Cheng
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan
| | - Yutaka Hiro
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan
| | - Toshimasa Hojo
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan; Department of Frontier Science for Advanced Environment, Graduate School of Environmental Sciences, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan.
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14
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Lee K, Park JS, Iqbal T, Nahm CH, Park PK, Choo KH. Membrane biofouling behaviors at cold temperatures in pilot-scale hollow fiber membrane bioreactors with quorum quenching. BIOFOULING 2018; 34:912-924. [PMID: 30369244 DOI: 10.1080/08927014.2018.1515925] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/25/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
In this study, the seasonality of the biofouling behavior of pilot-scale membrane bioreactors (MBRs) run in parallel with vacant sheets and quorum quenching (QQ) sheets using real municipal wastewater was investigated. QQ media delayed fouling, but low temperatures caused severe biofouling. The greater amount of extracellular polymeric substances (EPSs) produced in cold weather was responsible for the faster biofouling of a membrane, even with QQ media. There were significant negative relationships between EPS levels and water temperature. Cold weather was detrimental to the degradation of quorum sensing signal molecules by QQ sheets, whose activity was restored with a higher dose of QQ bacteria. The QQ bacteria in the sheets experienced a slight loss in activity during the early stage of the field test, but survived in the pilot-scale MBR fed with real wastewater. There were no significant discrepancies in treatment efficiency among conventional, vacant, and QQ MBRs.
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Affiliation(s)
- Kibaek Lee
- a Advanced Institute of Water Industry , Kyungpook National University , Daegu , Republic of Korea
| | - Jun-Seong Park
- b Department of Environmental Engineering , Kyungpook National University , Daegu , Republic of Korea
| | - Tahir Iqbal
- b Department of Environmental Engineering , Kyungpook National University , Daegu , Republic of Korea
| | - Chang Hyun Nahm
- c Department of Environmental Engineering , Yonsei University , Wonju , Gangwon-do , Republic of Korea
| | - Pyung-Kyu Park
- c Department of Environmental Engineering , Yonsei University , Wonju , Gangwon-do , Republic of Korea
| | - Kwang-Ho Choo
- a Advanced Institute of Water Industry , Kyungpook National University , Daegu , Republic of Korea
- b Department of Environmental Engineering , Kyungpook National University , Daegu , Republic of Korea
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15
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Preparation and performance evaluation of high-density polyethylene/silica nanocomposite membranes in membrane bioreactor system. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2017.08.015] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Diversity of culturable aerobic denitrifying bacteria in the sediment, water and biofilms in Liangshui River of Beijing, China. Sci Rep 2017; 7:10032. [PMID: 28855587 PMCID: PMC5577267 DOI: 10.1038/s41598-017-09556-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 07/24/2017] [Indexed: 01/17/2023] Open
Abstract
Aerobic denitrification is a process reducing the nitrate into gaseous nitrogen forms in the presence of oxygen gas, which makes the nitrification and denitrification performed simultaneously. However, little was known on the diversity of the culturable aerobic denitrifying bacteria in the surface water system. In this study, 116 strains of aerobic denitrifying bacteria were isolated from the sediment, water and biofilm samples in Liangshui River of Beijing. These bacteria were classified into 14 genera based on the 16 S rDNA, such as Pseudomonas, Rheinheimera, and Gemmobacter. The Pseudomonas sp., represented by the Pseudomonas stutzeri, Pseudomonas mendocina and Pseudomonas putida, composed the major culturable aerobic denitrifiers of the river, followed by Ochrobactrum sp. and Rheinheimera sp. The PCA plot showed the unclassified Pseudomonas sp. and Rheinheimera pacifica preferred to inhabit in biofilm phase while one unclassified Ochrobactrum sp. and Pseudomonas resinovorans had higher abundance in the sediment. In the overlying water, the Pseudomonas stutzeri and Ochrobactrum rhizosphaerae were found to have higher abundance, indicating these aerobic denitrifiers had different habitat-preferable characteristics among the 3 phases of river system. The findings may help select the niche to isolate the aerobic denitrifiers and facilitate the bioaugmentation-based purification of the nitrate polluted surface water.
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17
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Luo J, Lv P, Zhang J, Fane AG, McDougald D, Rice SA. Succession of biofilm communities responsible for biofouling of membrane bio-reactors (MBRs). PLoS One 2017; 12:e0179855. [PMID: 28686622 PMCID: PMC5501448 DOI: 10.1371/journal.pone.0179855] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 06/05/2017] [Indexed: 01/26/2023] Open
Abstract
Biofilm formation is one of the main factors associated with membrane biofouling in membrane bioreactors (MBRs). As such, it is important to identify the responsible organisms to develop targeted strategies to control biofouling. This study investigated the composition and changes in the microbial communities fouling MBR membranes over time and correlated those changes with an increase in transmembrane pressure (TMP). Based on qPCR data, bacteria were the dominant taxa of the biofilm (92.9–98.4%) relative to fungi (1.5–6.9%) and archaea (0.03–0.07%). NMDS analysis indicated that during the initial stages of operation, the biofilm communities were indistinguishable from those found in the sludge. However, the biofilm community significantly diverged from the sludge over time and ultimately showed a unique biofilm profile. This suggested that there was strong selection for a group of organisms that were biofilm specialists. This pattern of succession and selection was correlated with the rapid increase in TMP, where bacteria including Rhodospirillales, Sphingomonadales and Rhizobiales dominated the biofilm at this time. While most of the identified fungal OTUs matched Candida sp., the majority of fungal communities were unclassified by 18S rRNA gene sequencing. Collectively, the data suggests that bacteria, primarily, along with fungi may play an important role in the rapid TMP increase and loss of system performance.
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Affiliation(s)
- Jinxue Luo
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, Singapore
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
| | - Pengyi Lv
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, China
| | - Jinsong Zhang
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, Singapore
| | - Anthony G. Fane
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, Singapore
| | - Diane McDougald
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- The ithree Institute, The University of Technology Sydney, Sydney New South Wales, Sydney, Australia
| | - Scott A. Rice
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- The ithree Institute, The University of Technology Sydney, Sydney New South Wales, Sydney, Australia
- Centre for Marine Bio-Innovation, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, Australia
- * E-mail:
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18
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Zhao G, Chen WN. Biofouling formation and structure on original and modified PVDF membranes: role of microbial species and membrane properties. RSC Adv 2017. [DOI: 10.1039/c7ra04459c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The finding confirmed that the membrane hydrophilicity affected the formation of biofouling. The microbial species also played an essential role in the formation and structure of biofilms as the species affected each other's adhesion behavior.
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Affiliation(s)
- Guili Zhao
- Nanyang Environment and Water Research Institute
- Interdisciplinary Graduate School
- Nanyang Technological University
- Singapore 637141
- Singapore
| | - Wei Ning Chen
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
- Singapore 637459
- Singapore
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19
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Lee EJ, An AKJ, Hadi P, Yan DYS, Kim HS. A mechanistic study of in situ chemical cleaning-in-place for a PTFE flat sheet membrane: fouling mitigation and membrane characterization. BIOFOULING 2016; 32:301-312. [PMID: 26905269 DOI: 10.1080/08927014.2016.1140746] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study aimed at unfolding the role and mechanisms of chemically enhanced cleaning-in-place (CIP) regimes in fouling control of polytetrafluoroethylene (PTFE) made flat sheet (FS) membrane bio-reactors (MBRs). The trans-membrane pressure (TMP) was successfully maintained below 10 kPa using a daily CIP regime consisting of 100 to 600 mg l(-1) of NaOCl and cake layer resistance control was shown to be critical for effective high-flux MBR operation. In contrast, in the control unit without the CIP, the TMP exceeded 35 kPa at a flux of 40 LMH. The extracellular polymeric substances associated with proteins (EPSprotein) were also controlled effectively with a daily application of the CIP to the fouled membrane. Moreover, the CIP prompted a thinner and looser bio-cake layer on the membrane surface, suggesting that in situ CIP can be a favorable method to control FS membrane fouling at high-flux MBR operation.
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Affiliation(s)
- Eui-Jong Lee
- a Faculty of Science & Technology , School of Energy and Environment, City University of Hong Kong , Hong Kong , PR China
| | - Alicia K J An
- a Faculty of Science & Technology , School of Energy and Environment, City University of Hong Kong , Hong Kong , PR China
| | - Pejman Hadi
- a Faculty of Science & Technology , School of Energy and Environment, City University of Hong Kong , Hong Kong , PR China
| | - Dickson Y S Yan
- b Faculty of Science & Technology , the Technological and Higher Education Institute of Hong Kong , Hong Kong , PR China
| | - Hyung-Sook Kim
- c Department of Food and Nutrition , School of Human Ecology, The University of Suwon , Hwaseong-Si , Republic of Korea
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