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Cheng S, Zhang Y, Zhao Y, Hu X, Lin H, Teng J, Zhang M. Harnessing diurnal dynamics: Deciphering the interplay of light cycles on algal-bacterial membrane bioreactors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 913:169644. [PMID: 38159758 DOI: 10.1016/j.scitotenv.2023.169644] [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: 10/08/2023] [Revised: 12/05/2023] [Accepted: 12/22/2023] [Indexed: 01/03/2024]
Abstract
Light profoundly modulates the algal-bacterial membrane bioreactor (algal-bacterial MBR) performance. Yet, its outdoor deployment grapples with the inherent diurnal cycle of sunlight, engendering suboptimal light conditions. The adaptability of such systems to these fluctuating light conditions and their implications for practical outdoor applications remained an under-explored frontier. In response, this study meticulously scrutinized two laboratory-scale algal-bacterial MBRs under varying light regimes: a 24-h continuous and a 12-h cyclic illumination. Over 70 days, continuous illumination was observed to yield superior biomass production and total nitrogen and total phosphorus removal efficiencies compared to its cyclic counterpart. Contrarily, when focusing on membrane fouling, the 12-h cyclic illumination exhibited lower membrane fouling. The spectral analyses coupled with adhesion ability evaluation, traced the enhanced membrane fouling under continuous illumination to the elevated organics and heightened adhesive properties of the flocs. Given the tangible benefits of reduced membrane fouling and the potential harnessing of solar radiation, the 12-h cyclic illumination emerges as an economically astute operational paradigm for algal-bacterial MBRs. The significance of this study is to promote the application of algal-bacterial MBR in sewage treatment and provide robust support for the development of green technology in the future.
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Affiliation(s)
- Sihan Cheng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, Zhejiang, China.
| | - Yuwei Zhang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, Zhejiang, China.
| | - Yu Zhao
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, Zhejiang, China.
| | - Xin Hu
- Jinhua Zhou Neng Technology Co. Ltd., Jinhua, Zhejiang, China
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - Jiaheng Teng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, Zhejiang, China.
| | - Meijia Zhang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, Zhejiang, China.
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2
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Nan Z, Floquet P, Combes D, Tendero C, Castelain M. Surface Conditioning Effects on Submerged Optical Sensors: A Comparative Study of Fused Silica, Titanium Dioxide, Aluminum Oxide, and Parylene C. SENSORS (BASEL, SWITZERLAND) 2023; 23:9546. [PMID: 38067919 PMCID: PMC10708880 DOI: 10.3390/s23239546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/17/2023] [Accepted: 11/27/2023] [Indexed: 12/18/2023]
Abstract
Optical sensors excel in performance but face efficacy challenges when submerged due to potential surface colonization, leading to signal deviation. This necessitates robust solutions for sustained accuracy. Protein and microorganism adsorption on solid surfaces is crucial in antibiofilm studies, contributing to conditioning film and biofilm formation. Most studies focus on surface characteristics (hydrophilicity, roughness, charge, and composition) individually for their adhesion impact. In this work, we tested four materials: silica, titanium dioxide, aluminum oxide, and parylene C. Bovine Serum Albumin (BSA) served as the biofouling conditioning model, assessed with X-ray photoelectron spectroscopy (XPS). Its effect on microorganism adhesion (modeled with functionalized microbeads) was quantified using a shear stress flow chamber. Surface features and adhesion properties were correlated via Principal Component Analysis (PCA). Protein adsorption is influenced by nanoscale roughness, hydrophilicity, and likely correlated with superficial electron distribution and bond nature. Conditioning films alter the surface interaction with microbeads, affecting hydrophilicity and local charge distribution. Silica shows a significant increase in microbead adhesion, while parylene C exhibits a moderate increase, and titanium dioxide shows reduced adhesion. Alumina demonstrates notable stability, with the conditioning film minimally impacting adhesion, which remains low.
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Affiliation(s)
- Zibin Nan
- TBI, Université de Toulouse, CNRS UMR5504, INRAe UMR792—INSA 135, avenue de Rangueil, 31055 Toulouse, France
| | - Pascal Floquet
- LGC, Université de Toulouse, CNRS, INPT, UPS—ENSIACET 4, allée Émile Monso, 31030 Toulouse, France;
| | - Didier Combes
- TBI, Université de Toulouse, CNRS UMR5504, INRAe UMR792—INSA 135, avenue de Rangueil, 31055 Toulouse, France
| | - Claire Tendero
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS—ENSIACET 4, allée Émile Monso, 31030 Toulouse, France;
| | - Mickaël Castelain
- TBI, Université de Toulouse, CNRS UMR5504, INRAe UMR792—INSA 135, avenue de Rangueil, 31055 Toulouse, France
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3
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Eskhan A, AlQasas N, Johnson D. Interaction Mechanisms and Predictions of the Biofouling of Polymer Films: A Combined Atomic Force Microscopy and Quartz Crystal Microbalance with Dissipation Monitoring Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:6592-6612. [PMID: 37104647 PMCID: PMC10173465 DOI: 10.1021/acs.langmuir.3c00587] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Biofouling of polymeric membranes is a severe problem in water desalination and treatment applications. A fundamental understanding of biofouling mechanisms is necessary to control biofouling and develop more efficient mitigation strategies. To shed light on the type of forces that govern the interactions between biofoulants and membranes, biofoulant-coated colloidal AFM probes were employed to investigate the biofouling mechanisms of two model biofoulants, BSA and HA, toward an array of polymer films commonly used in membrane synthesis, which included CA, PVC, PVDF, and PS. These experiments were combined with quartz crystal microbalance with dissipation monitoring (QCM-D) measurements. The Derjaguin, Landau, Verwey, and Overbeek (DLVO) and the extended-DLVO (XDLVO) theoretical models were applied to decouple the overall adhesion interactions between the biofoulants and the polymer films into their component interactions, i.e., electrostatic (El), Lifshitz-van der Waals (LW), and Lewis acid-base (AB) interactions. The XDLVO model was found to predict better the AFM colloidal probe adhesion data and the QCM-D adsorption behavior of BSA onto the polymer films than the DLVO model. The ranking of the polymer films' adhesion strengths and adsorption quantities was inversely proportional to their γ- values. Higher normalized adhesion forces were quantified for the BSA-coated colloidal probes with the polymer films than the HA-coated colloidal probes. Similarly, in QCM-D measurements, BSA was found to cause larger adsorption mass shifts, faster adsorption rates, and more condensed fouling layers than HA. A linear correlation (R2 = 0.96) was obtained between the adsorption standard free energy changes (ΔGads°) estimated for BSA from the equilibrium QCM-D adsorption experiments and the AFM normalized adhesion energies (WAFM/R) estimated for BSA from the AFM colloidal probe measurements. Eventually, an indirect approach was presented to calculate the surface energy components of biofoulants characterized by high porosities from Hansen dissolution tests to perform the DLVO/XDLVO analyses.
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Affiliation(s)
- Asma Eskhan
- NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), 129188 Abu Dhabi, UAE
| | - Neveen AlQasas
- NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), 129188 Abu Dhabi, UAE
| | - Daniel Johnson
- NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), 129188 Abu Dhabi, UAE
- Division of Engineering, New York University Abu Dhabi, 129188 Abu Dhabi, UAE
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4
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Solvent transport model for polyamide nanofilm membranes based on accurate Hansen solubility parameters. J Memb Sci 2023. [DOI: 10.1016/j.memsci.2023.121505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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5
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Rahav E, Belkin N, Nnebuo O, Sisma-Ventura G, Guy-Haim T, Sharon-Gojman R, Geisler E, Bar-Zeev E. Jellyfish swarm impair the pretreatment efficiency and membrane performance of seawater reverse osmosis desalination. WATER RESEARCH 2022; 215:118231. [PMID: 35247603 DOI: 10.1016/j.watres.2022.118231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/16/2022] [Accepted: 02/24/2022] [Indexed: 06/14/2023]
Abstract
Circumstantial evidence has suggested that jellyfish swarms impair the operation of seawater reverse osmosis desalination facilities. However, only limited information is currently available on the pretreatment efficiency of jellyfish and their effects on reverse osmosis (RO) membrane performance. Here, we have comprehensively tested the pretreatment efficiency of a dual-media gravity filter and cartridge micro-filtration following the addition of jellyfish into the feedwater. Concurrently, the fouling propensity and performance of the RO membranes were examined. We show that jellyfish demise resulted in seawater eutrophication that triggered a significant increase in bacterial biomass (∼50-fold), activity (∼7-fold), and release of transparent exopolymer particles (∼5-fold), peaking three days after the addition of jellyfish into the feedwater. In parallel, a significant reduction in permeate water flux was recorded (∼10%) while trans-membrane pressure sharply increased (15%), reaching the operation pressure limit of our system (75 bar) after five days. At the conclusion of the experiments, the membrane surface was heavily covered by large chunks of organic-rich material and multilayered biofilms. Our results provide a holistic view on the operational challenges of seawater reverse osmosis (SWRO) desalination triggered by jellyfish swarms in coastal areas. Following the above, it can be inferred that freshwater production will likely be halted three days after drawing the jellyfish into the pretreatment system. Outcomes from these results may lead to the development of science-based operational protocols to cope with growing occurrence of jellyfish swarms around the intake of SWRO desalination facilities worldwide.
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Affiliation(s)
- Eyal Rahav
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel.
| | - Natalia Belkin
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel
| | - Oluebube Nnebuo
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
| | - Guy Sisma-Ventura
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel
| | - Tamar Guy-Haim
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel
| | - Revital Sharon-Gojman
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
| | - Eyal Geisler
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel; Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
| | - Edo Bar-Zeev
- Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel.
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6
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Yang M, Lotfikatouli S, Chen Y, Li T, Ma H, Mao X, Hsiao BS. Nanostructured all-cellulose membranes for efficient ultrafiltration of wastewater. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120422] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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7
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Begum Tanis-Kanbur M, Raj Tamilselvam N, Wei Chew J. Membrane fouling mechanisms by BSA in aqueous-organic solvent mixtures. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.01.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Li Z, Wu C, Huang J, Zhou R, Jin Y. Membrane Fouling Behavior of Forward Osmosis for Fruit Juice Concentration. MEMBRANES 2021; 11:membranes11080611. [PMID: 34436374 PMCID: PMC8398857 DOI: 10.3390/membranes11080611] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/30/2021] [Accepted: 08/05/2021] [Indexed: 11/16/2022]
Abstract
Forward osmosis (FO) technology has a broad application prospect in the field of liquid food concentration because of the complete retention of flavor components and bioactive substances. Membrane fouling is the main obstacle affecting the FO performance and concentration efficiency. This work systematically investigated the membrane fouling behavior of the FO process for fruit juice concentration elucidated by the models of resistance-in-series, xDLVO theory and FTIR analysis. The results show that the AL-FS mode was more suitable for concentrating orange juice. Increasing the cross-flow rate and pretreatment of feed solutions can effectively improve the water flux and reduce the fouling resistance. The ATR-FTIR analysis revealed that the fouling layer of orange juice was mainly composed of proteins and polysaccharides, and the pretreatment of microfiltration can greatly reduce the content of the major foulant. There was an attractive interaction between the FO membrane and orange juice foulants; by eliminating those foulants, the microfiltration pretreatment then weakened such an attractive interaction and effectively prevented the fouling layer from growing, leading to a lower process resistance and, finally, resulting in a great improvement of concentration efficiency.
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Affiliation(s)
- Zihe Li
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; (Z.L.); (C.W.); (J.H.); (R.Z.)
- Key Laboratory for Leather and Engineering of the Education Ministry, Sichuan University, Chengdu 610065, China
| | - Chongde Wu
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; (Z.L.); (C.W.); (J.H.); (R.Z.)
- Key Laboratory for Leather and Engineering of the Education Ministry, Sichuan University, Chengdu 610065, China
| | - Jun Huang
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; (Z.L.); (C.W.); (J.H.); (R.Z.)
- Key Laboratory for Leather and Engineering of the Education Ministry, Sichuan University, Chengdu 610065, China
| | - Rongqing Zhou
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; (Z.L.); (C.W.); (J.H.); (R.Z.)
- Key Laboratory for Leather and Engineering of the Education Ministry, Sichuan University, Chengdu 610065, China
- National Engineering Research Center of Solid-State Manufacturing, Luzhou 646000, China
| | - Yao Jin
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; (Z.L.); (C.W.); (J.H.); (R.Z.)
- Key Laboratory for Leather and Engineering of the Education Ministry, Sichuan University, Chengdu 610065, China
- Correspondence:
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9
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Zhou H, Ji CC, Li JQ, Hu YX, Xu XH, An Y, Cheng LH. Understanding the interaction mechanism of algal cells and soluble algal products foulants in forward osmosis dewatering. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118835] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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10
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Li H, Xing Y, Cao T, Dong J, Liang S. Evaluation of the fouling potential of sludge in a membrane bioreactor integrated with microbial fuel cell. CHEMOSPHERE 2021; 262:128405. [PMID: 33182156 DOI: 10.1016/j.chemosphere.2020.128405] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/17/2020] [Accepted: 09/20/2020] [Indexed: 06/11/2023]
Abstract
This study focused on the fouling characteristics evaluation of the sludge in a membrane bioreactor integrated with microbial fuel cell (MFC-MBR) to reveal the mechanisms of membrane fouling mitigation. The filtration of soluble microbial products (SMPs) in MFC-MBR showed lower flux decline rate than those in the control system (C-MBR). Based on the extended Derjaguin-Landau-Verwey-Overbeek analysis, decreases in free energies of adhesion between the SMPs and clean membrane or SMP-fouled membrane were observed in MFC-MBR. When approaching the clean membrane or SMP-fouled membrane, the SMPs in MFC-MBR had to overcome a higher energy barrier compared to those in C-MBR, indicating the inhibition of adsorption of SMPs on the membrane surface in MFC-MBR. Additionally, sludge flocs in MFC-MBR exhibited lower hydrophobicity and were less negative surface charged in comparison to those in the C-MBR. In MFC-MBR, the sludge flocs approaching the clean membrane, SMP-fouled membrane and cake layer all experienced higher energy barriers and lower secondary energy minimums compared to those in C-MBR, exhibiting the lower potential of cake layer formation. These results confirmed that decreases of the fouling potentials of SMPs and sludge flocs were essential for the membrane fouling mitigation in the MFC-MBR.
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Affiliation(s)
- Hui Li
- College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding, 071002, China.
| | - Yan Xing
- College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China
| | - Tengliang Cao
- College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China
| | - Jiangxue Dong
- College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China
| | - Shuxuan Liang
- College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding, 071002, China
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11
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Encinas N, Yang CY, Geyer F, Kaltbeitzel A, Baumli P, Reinholz J, Mailänder V, Butt HJ, Vollmer D. Submicrometer-Sized Roughness Suppresses Bacteria Adhesion. ACS APPLIED MATERIALS & INTERFACES 2020; 12:21192-21200. [PMID: 32142252 PMCID: PMC7226781 DOI: 10.1021/acsami.9b22621] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 02/26/2020] [Indexed: 05/12/2023]
Abstract
Biofilm formation is most commonly combatted with antibiotics or biocides. However, proven toxicity and increasing resistance of bacteria increase the need for alternative strategies to prevent adhesion of bacteria to surfaces. Chemical modification of the surfaces by tethering of functional polymer brushes or films provides a route toward antifouling coatings. Furthermore, nanorough or superhydrophobic surfaces can delay biofilm formation. Here we show that submicrometer-sized roughness can outweigh surface chemistry by testing the adhesion of E. coli to surfaces of different topography and wettability over long exposure times (>7 days). Gram-negative and positive bacterial strains are tested for comparison. We show that an irregular three-dimensional layer of silicone nanofilaments suppresses bacterial adhesion, both in the presence and absence of an air cushion. We hypothesize that a 3D topography can delay biofilm formation (i) if bacteria do not fit into the pores of the coating or (ii) if bending of the bacteria is required to adhere. Thus, such a 3D topography offers an underestimated possibility to design antibacterial surfaces that do not require biocides or antibiotics.
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Affiliation(s)
- Noemí Encinas
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Ching-Yu Yang
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Florian Geyer
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Anke Kaltbeitzel
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Philipp Baumli
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Jonas Reinholz
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Department of Dermatology, University Medical Center of the Johannes Gutenberg-University
Mainz, Langenbeckstrasse
1, Mainz 55131, Germany
| | - Volker Mailänder
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Department of Dermatology, University Medical Center of the Johannes Gutenberg-University
Mainz, Langenbeckstrasse
1, Mainz 55131, Germany
| | - Hans-Jürgen Butt
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Doris Vollmer
- Max Planck Institute
for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
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12
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Karkooti A, Rastgar M, Nazemifard N, Sadrzadeh M. Study on antifouling behaviors of GO modified nanocomposite membranes through QCM-D and surface energetics analysis. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124332] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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13
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Kim LH, Vrouwenvelder JS. Insignificant Impact of Chemotactic Responses of Pseudomonas aeruginosa on the Bacterial Attachment to Organic Pre-Conditioned RO Membranes. MEMBRANES 2019; 9:membranes9120162. [PMID: 31810273 PMCID: PMC6950137 DOI: 10.3390/membranes9120162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 11/25/2019] [Accepted: 11/28/2019] [Indexed: 12/03/2022]
Abstract
We investigated the impact of conditioning compositions on the way bacteria move and adhere to reverse osmosis (RO) membranes that have been pre-conditioned by organic compounds. We used humic acid (HA), bovine serum albumin (BSA), and sodium alginate (SA) to simulate conditioning layers on the RO membranes. First, we investigated the chemotactic responses of Pseudomonas aeruginosa PAO1 to the organic substances and the impact of changes in physicochemical characteristics of pre-conditioned membranes on bacterial attachment. Second, we observed bacterial attachment under the presence or absence of nutrients or microbial metabolic activity. Results showed that there was no relationship between the chemotactic response of P. aeruginosa PAO1 and the organic substances, and the changes in hydrophobicity, surface free energy, and surface charge resulting from changing the composition of the conditioning layer did not seem to affect bacterial attachment, whereas changing the roughness of the conditioned membrane exponentially did (exponential correlation coefficient, R2 = 0.85). We found that the initial bacterial attachment on the membrane surface is influenced by (i) the nutrients in the feed solution and (ii) the microbial metabolic activity, whereas the chemotaxis response has a negligible impact. This study would help to establish a suitable strategy to manage bacterial attachment.
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Affiliation(s)
- Lan Hee Kim
- Water Desalination and Reuse Center (WDRC), Division of Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;
| | - Johannes S. Vrouwenvelder
- Water Desalination and Reuse Center (WDRC), Division of Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;
- Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
- Correspondence:
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14
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Zhao F, Li Z, Zhou X, Chu H, Jiang S, Yu Z, Zhou X, Zhang Y. The comparison between vibration and aeration on the membrane performance in algae harvesting. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.117390] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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15
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Rezzadori K, Penha FM, Proner MC, Zin G, Petrus JCC, Di Luccio M. Impact of Organic Solvents on Physicochemical Properties of Nanofiltration and Reverse‐Osmosis Membranes. Chem Eng Technol 2019. [DOI: 10.1002/ceat.201900020] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Katia Rezzadori
- Federal University of Rio Grande do SulInstitute of Food Science and Technology, Department of Food Technology 91501-970 Porto Alegre Brazil
| | - Frederico M. Penha
- University of São PauloPolytechnic School, Department of Chemical Engineering Av. Prof. Luciano Gualberto, trav.3, n.380 05508-010 São Paulo São Paulo Brazil
| | - Mariane C. Proner
- Federal University of Santa CatarinaDepartment of Chemical and Food Engineering 88040-900 Florianopolis Brazil
| | - Guilherme Zin
- Federal University of Santa CatarinaDepartment of Chemical and Food Engineering 88040-900 Florianopolis Brazil
| | - José C. C. Petrus
- Federal University of Santa CatarinaDepartment of Chemical and Food Engineering 88040-900 Florianopolis Brazil
| | - Marco Di Luccio
- Federal University of Santa CatarinaDepartment of Chemical and Food Engineering 88040-900 Florianopolis Brazil
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16
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Morón-López J, Nieto-Reyes L, Aguado S, El-Shehawy R, Molina S. Recycling of end-of-life reverse osmosis membranes for membrane biofilms reactors (MBfRs). Effect of chlorination on the membrane surface and gas permeability. CHEMOSPHERE 2019; 231:103-112. [PMID: 31128344 DOI: 10.1016/j.chemosphere.2019.05.108] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 02/14/2019] [Accepted: 05/14/2019] [Indexed: 06/09/2023]
Abstract
Reducing human impacts on drinking water is one of the main challenges for the water treatment industry. This work provides new results to support the recycling of EoL desalination reverse osmosis (RO) membranes for Membranes Biofilm Reactors (MBfRs). We investigate if the controlled-removal of fouling and polyamide layer may favor the use of these membranes in MBfRs. It also would allow establishing a normalized methodology of membrane recycling, regardless of inherited fouling during its lifespan. For this purpose, we transform by chlorination discarded brackish (BWd) and seawater (SWd) membranes into nanofiltration (BWt-NF and SWt-NF) and ultrafiltration (BWt-UF and SWt-UF) membranes. Our results show that chlorine attacks allow the fouling cleaning while improves the hydrophilicity and maintains roughness only in BWt-NF. Therefore, the bacterial deposition in this membrane is greater than the other tested membranes. Besides, the microcystin (MC) degradation capacity of BWt-NF verifies the compatibility of the chemical modification for the biological activity of MC-degrading bacteria. Finally, our results also provide that polyamide thin-film composite (PA-TFC) membranes, originally manufactured for salt rejection during desalination processes, offer competitive gases diffusion at low pressures. Therefore, we conclude that the membrane recycling may provide alternative low cost and gas permeable membranes for MBfRs, according to circular economy principles.
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Affiliation(s)
- Jesús Morón-López
- IMDEA Water Institute, Punto Com. nº 2. 28805, Alcalá de Henares, Madrid, Spain; Chemical Engineering Department, University of Alcalá, Ctra. Madrid-Barcelona Km 33,600, Alcalá de Henares, Madrid, 28871, Spain.
| | - Lucía Nieto-Reyes
- IMDEA Water Institute, Punto Com. nº 2. 28805, Alcalá de Henares, Madrid, Spain
| | - Sonia Aguado
- Chemical Engineering Department, University of Alcalá, Ctra. Madrid-Barcelona Km 33,600, Alcalá de Henares, Madrid, 28871, Spain
| | - Rehab El-Shehawy
- IMDEA Water Institute, Punto Com. nº 2. 28805, Alcalá de Henares, Madrid, Spain; Department of Environmental Science and Analytical Chemistry, Stockholm University, Sweden
| | - Serena Molina
- IMDEA Water Institute, Punto Com. nº 2. 28805, Alcalá de Henares, Madrid, Spain
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17
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Siebdrath N, Farhat N, Ding W, Kruithof J, Vrouwenvelder JS. Impact of membrane biofouling in the sequential development of performance indicators: Feed channel pressure drop, permeability, and salt rejection. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.05.043] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Segev-Mark N, Vu A, Chen N, Qian X, Wickramasinghe SR, Ramon GZ. Colloidal deposition on polymer-brush-coated NF membranes. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.02.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Tanudjaja HJ, Hejase CA, Tarabara VV, Fane AG, Chew JW. Membrane-based separation for oily wastewater: A practical perspective. WATER RESEARCH 2019; 156:347-365. [PMID: 30928529 DOI: 10.1016/j.watres.2019.03.021] [Citation(s) in RCA: 203] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 02/26/2019] [Accepted: 03/14/2019] [Indexed: 06/09/2023]
Abstract
The large volumes of oily wastewater generated by various industries, such as oil and gas, food and beverage, and metal processing, need to be de-oiled prior to being discharged into the environment. Compared to conventional technologies such as dissolved air flotation (DAF), coagulation or solvent extraction, membrane filtration can treat oily wastewater of a much broader compositional range and still ensure high oil removals. In the present review, various aspects related to the practical implementation of membranes for the treatment of oily wastewater are summarized. First, sources and composition of oily wastewater, regulations that stipulate the extent of treatment needed before discharge, and the conventional technologies that enable such treatment are appraised. Second, commercially available membranes, membrane modules, operation modes and hybrids are overviewed, and their economics are discussed. Third, challenges associated with membrane filtration are examined, along with means to quantify and mitigate membrane fouling. Finally, perspectives on state-of-the-art techniques to facilitate better monitoring and control of such systems are briefly discussed.
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Affiliation(s)
- Henry J Tanudjaja
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 37459, Singapore
| | - Charifa A Hejase
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Volodymyr V Tarabara
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Anthony G Fane
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore
| | - Jia Wei Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 37459, Singapore; Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore.
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20
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Fan X, Liu Y, Wang X, Quan X, Chen S. Improvement of Antifouling and Antimicrobial Abilities on Silver-Carbon Nanotube Based Membranes under Electrochemical Assistance. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:5292-5300. [PMID: 30933494 DOI: 10.1021/acs.est.9b00313] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Excellent fouling resistance to various foulants is crucial to maintain the separation performance of membranes in providing potable water. Antimicrobial modification is effective for antibiofouling but fails to mitigate organic fouling. Improving surface charges can improve the resistance to charged foulants, but the lack of antimicrobial ability results in bacterial aggregation. Herein, a silver nanoparticle modified carbon nanotube (Ag-CNT)/ceramic membrane was prepared with enhanced antifouling and antimicrobial properties under electrochemical assistance. The presence of silver nanoparticles endows the composite membrane with antimicrobial ability by which biofilm formation is inhibited. Its steady-state flux is 1.9 times higher than that for an unmodified membrane in filtering bacterial suspension. Although the formation of organic fouling did weaken the biofouling resistance, the negatively charged bacteria and organic matter can be sufficiently repelled away from the cathodic membrane under electrochemical assistance. The flux loss under a low-voltage of 2.0 V decreased to <10% from >35% for the membrane alone when bacteria and organic matter coexisted in the feedwater. More importantly, silver dissolution was significantly inhibited via an in situ electroreduction process by which the Ag+ concentration in the effluent (<1.0 μg/L) was about 2 orders of magnitude lower than that without voltage. The integration of antimicrobial modification and electrochemistry offers a new prospect in the development of membranes with high fouling resistance in water treatment.
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Affiliation(s)
- Xinfei Fan
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
- College of Environmental Science and Engineering , Dalian Maritime University , Dalian 116026 , China
| | - Yanming Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
| | - Xiaochen Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
| | - Xie Quan
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
| | - Shuo Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
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21
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Yu Y, Park KY, Jung J, Song W, Kim J, Ryu J, Lade H, Kweon J. Monitoring biofouling based on aerobic respiration in reverse osmosis system. J Environ Sci (China) 2019; 78:247-256. [PMID: 30665643 DOI: 10.1016/j.jes.2018.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 10/10/2018] [Accepted: 10/12/2018] [Indexed: 06/09/2023]
Abstract
A monitoring method of biofouling in reverse osmosis (RO) system was proposed based on the fluorescent signal of resorufin, which is reduced by nicotinamide adenine dinucleotide released from viable cells during aerobic respiration. The fluorescent signal of resorufin reduced by planktonic cells and microorganisms of biofilm showed linearity, indicating its feasibility to monitor biofouling in a RO system. For the application of the method to the lab-scale RO system, the injection concentration of resazurin and the injection flow rate were optimized. Biofilm on RO membranes continuously operated in a lab-scale RO system was estimated by resorufin fluorescence under optimized detection condition. As a result, resorufin fluorescence on RO membrane showed a significant increase in which the permeability of RO system decreased by 30.48%. Moreover, it represented the development of biofilm as much as conventional biofilm parameters such as adenosine triphosphate, extracellular polymeric substances, and biofilm thickness. The proposed method could be used as a sensitive and low-cost technology to monitor biofouling without autopsy of membranes.
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Affiliation(s)
- Youngjae Yu
- Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea
| | - Keun-Young Park
- Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea
| | - Jaehyun Jung
- Department of Environment and Energy, Sejong University, Seoul 05006, Korea
| | - Wonjung Song
- Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea
| | - Jaehyeok Kim
- Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea
| | - Junhee Ryu
- Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea
| | - Harshad Lade
- Department of Laboratory Medicine, Hallym University Medical Center, Seoul 07247, Korea
| | - Jihyang Kweon
- Department of Environmental Engineering, Konkuk University, Seoul 05029, Korea.
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22
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Morón-López J, Nieto-Reyes L, Senán-Salinas J, Molina S, El-Shehawy R. Recycled desalination membranes as a support material for biofilm development: A new approach for microcystin removal during water treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 647:785-793. [PMID: 30096668 DOI: 10.1016/j.scitotenv.2018.07.435] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 07/30/2018] [Accepted: 07/30/2018] [Indexed: 06/08/2023]
Abstract
Increased harmful cyanobacterial blooms and drought are some negative impacts of global warming. To deal with cyanotoxin release during water treatment, and to manage the massive quantities of end-of-life membrane waste generated by desalination processes, we propose an innovative biological system developed from recycled reverse osmosis (RO) membranes to remove microcystins (MC). Our system, named the Recycled-Membrane Biofilm Reactor (R-MBfR), effectively removes microcystins, while reducing the pollution impact of RO membrane waste by prolonging their life span at the same time. This multidisciplinary work showed that the inherent flaw of RO membranes, i.e., fouling, can be considered an advantageous characteristic for biofilm attachment. Factors such as roughness, hydrophilic surfaces, and the role of calcium in cell-cell and cell-surface interactions, encouraged bacterial growth on discarded membranes. Biofilm development was stimulated by using a laboratory-scale membrane module simulator cell. The R-MBfR proved versatile and was capable of degrading 2 mg·L-1 of MC in 24 h. The economic feasibility of the scaling-up of the hypothetical R-MBfR was also validated. Therefore, this membrane recycling could be a future green cost-effective alternative technology for MC removal.
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Affiliation(s)
- Jesús Morón-López
- IMDEA Water Institute, Spain; Chemical Engineering Department, University of Alcalá, Madrid, Spain.
| | | | | | | | - Rehab El-Shehawy
- IMDEA Water Institute, Spain; Department of Environmental Sciences and Analytical Chemistry, Stockholm University, Sweden.
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23
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Zhu Y, Yu S, Zhang B, Li J, Zhao D, Gu Z, Gong C, Liu G. Antifouling performance of polytetrafluoroethylene and polyvinylidene fluoride ultrafiltration membranes during alkali/surfactant/polymer flooding wastewater treatment: Distinctions and mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 642:988-998. [PMID: 29929150 DOI: 10.1016/j.scitotenv.2018.06.145] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 06/11/2018] [Accepted: 06/11/2018] [Indexed: 06/08/2023]
Abstract
Alkali/surfactant/polymer (ASP) flooding wastewater is highly caustic, and membrane fouling is the main obstacle during ASP ultrafiltration (UF) treatment. To maintain favorable filtration performance, polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) membranes were implemented here, and their antifouling properties and mechanisms were investigated based on the threshold flux theory. Compared with the PVDF membranes, the PTFE membranes exhibited superior antifouling properties with lower reductions in flux and smaller hydraulic resistance, and they presented a nearly identical pseudo-stable fouling rate at a later time point. In the fouling layers of the PTFE and PVDF membranes, anion polyacrylamide (APAM) was observed along with divalent/trivalent metal ions. The thermodynamic and molecular mechanisms of membrane fouling by APAM were elucidated using the Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory and atomic force microscopy (AFM), respectively. The calculated total interfacial free energy (mJ/m2) of adhesion between the APAM and PTFE membranes was positive, and the value between the APAM and PVDF membranes was negative. Furthermore, the values and interaction distances of the measured intermolecular rupture and approaching forces were larger for APAM-PTFE than for APAM-PVDF. For the PTFE membranes, the positive free energies and smaller intermolecular interaction resulted in weaker APAM-PTFE adhesion and adsorption and therefore the lower levels of flux decline and the later achievement of the pseudo-stable fouling rate. Additionally, the total flux recoveries observed after physical cleaning reached 0.78-0.80 and 0.32-0.39 for the PTFE and PVDF membranes, respectively, which showed that the PTFE membranes can be cleaned easily. The PTFE membranes have considerable potential for extensive application in UF treatments for ASP wastewater. These results should promote understanding the essence of the threshold flux and the fouling control of UF membranes.
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Affiliation(s)
- Youbing Zhu
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Shuili Yu
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
| | - Bing Zhang
- Heilongjiang Institute of Construction Technology, Heilongjiang 150025, China
| | - Jianfeng Li
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Dongsheng Zhao
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Zhengyang Gu
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Chao Gong
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Guicai Liu
- School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China.
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24
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Andalaft J, Schwarz A, Pino L, Fuentes P, Bórquez R, Aybar M. Assessment and Modeling of Nanofiltration of Acid Mine Drainage. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03576] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Javier Andalaft
- Department of Civil Engineering, Universidad de Concepción, P.O. Box 160-C, Concepción 4030000, Chile
| | - Alex Schwarz
- Department of Civil Engineering, Universidad de Concepción, P.O. Box 160-C, Concepción 4030000, Chile
- Center for Water Resources in Agriculture and Mining, CRHIAM, P.O. Box 160-C, Concepción 4030000, Chile
| | - Luis Pino
- Department of Chemical Engineering, Universidad de Concepción, P.O. Box 160-C, Concepción 4030000, Chile
| | - Paula Fuentes
- Department of Civil Engineering, Universidad de Concepción, P.O. Box 160-C, Concepción 4030000, Chile
| | - Rodrigo Bórquez
- Department of Chemical Engineering, Universidad de Concepción, P.O. Box 160-C, Concepción 4030000, Chile
- Center for Water Resources in Agriculture and Mining, CRHIAM, P.O. Box 160-C, Concepción 4030000, Chile
| | - Marcelo Aybar
- Department of Civil Engineering, Universidad de Concepción, P.O. Box 160-C, Concepción 4030000, Chile
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25
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Quantitative Analysis of Membrane Fouling Mechanisms Involved in Microfiltration of Humic Acid–Protein Mixtures at Different Solution Conditions. WATER 2018. [DOI: 10.3390/w10101306] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A systematical quantitative understanding of different mechanisms, though of fundamental importance for better fouling control, is still unavailable for the microfiltration (MF) of humic acid (HA) and protein mixtures. Based on extended Derjaguin–Landau–Verwey–Overbeek (xDLVO) theory, the major fouling mechanisms, i.e., Lifshitz–van der Waals (LW), electrostatic (EL), and acid–base (AB) interactions, were for the first time quantitatively analyzed for model HA–bovine serum albumin (BSA) mixtures at different solution conditions. Results indicated that the pH, ionic strength, and calcium ion concentration of the solution significantly affected the physicochemical properties and the interaction energy between the polyethersulfone (PES) membrane and HA–BSA mixtures. The free energy of cohesion of the HA–BSA mixtures was minimum at pH = 3.0, ionic strength = 100 mM, and c(Ca2+) = 1.0 mM. The AB interaction energy was a key contributor to the total interaction energy when the separation distance between the membrane surface and HA–BSA mixtures was less than 3 nm, while the influence of EL interaction energy was of less importance to the total interaction energy. The attractive interaction energies of membrane–foulant and foulant–foulant increased at low pH, high ionic strength, and calcium ion concentration, thus aggravating membrane fouling, which was supported by the fouling experimental results. The obtained findings would provide valuable insights for the quantitative understanding of membrane fouling mechanisms of mixed organics during MF.
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26
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Shen L, Wang X, Li R, Yu H, Hong H, Lin H, Chen J, Liao BQ. Physicochemical correlations between membrane surface hydrophilicity and adhesive fouling in membrane bioreactors. J Colloid Interface Sci 2017; 505:900-909. [DOI: 10.1016/j.jcis.2017.06.090] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 06/22/2017] [Accepted: 06/26/2017] [Indexed: 11/16/2022]
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27
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Preparation of PVDF/GO SiO2 hybrid microfiltration membrane towards enhanced perm-selectivity and anti-fouling property. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.06.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Liu J, Tian J, Wang Z, Zhao D, Jia F, Dong B. Mechanism analysis of powdered activated carbon controlling microfiltration membrane fouling in surface water treatment. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.01.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Mishra G, Mukhopadhyay M. Flux improvement, rejection, surface energy and antibacterial properties of synthesized TiO2-Mo.HNTs/PVC nanocomposite ultrafiltration membranes. NEW J CHEM 2017. [DOI: 10.1039/c7nj02774e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work demonstrates the preparation of modified halloysite loaded with titanium dioxide (TiO2) nanoparticles and its use as a nanofiller in a poly(vinyl chloride) (PVC) hybrid ultrafiltration (UF) membrane for advanced water treatment.
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Affiliation(s)
- Gourav Mishra
- Chemical Engineering Department
- Sardar Vallabhbhai National Institute of Technology
- Surat
- India
| | - Mausumi Mukhopadhyay
- Chemical Engineering Department
- Sardar Vallabhbhai National Institute of Technology
- Surat
- India
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30
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Affiliation(s)
- Elina Yachnin
- Department of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Haifa, Israel
| | - Guy Z. Ramon
- Department of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Haifa, Israel
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31
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Kong Y, Wang Z, Ma Y, Hou L, Yao W. Theory investigation on the variation of fouling resistance during water rinsing process of the membrane fouled with sodium alginate. J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2016.06.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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32
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Dynamics of biofouling development on the conditioned membrane and its relationship with membrane performance. J Memb Sci 2016. [DOI: 10.1016/j.memsci.2016.04.066] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Chu H, Zhao F, Tan X, Yang L, Zhou X, Zhao J, Zhang Y. The impact of temperature on membrane fouling in algae harvesting. ALGAL RES 2016. [DOI: 10.1016/j.algal.2016.04.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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34
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Zhao F, Chu H, Su Y, Tan X, Zhang Y, Yang L, Zhou X. Microalgae harvesting by an axial vibration membrane: The mechanism of mitigating membrane fouling. J Memb Sci 2016. [DOI: 10.1016/j.memsci.2016.02.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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Reis R, Dumée LF, He L, She F, Orbell JD, Winther-Jensen B, Duke MC. Amine Enrichment of Thin-Film Composite Membranes via Low Pressure Plasma Polymerization for Antimicrobial Adhesion. ACS APPLIED MATERIALS & INTERFACES 2015; 7:14644-14653. [PMID: 26083007 DOI: 10.1021/acsami.5b01603] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Thin-film composite membranes, primarily based on poly(amide) (PA) semipermeable materials, are nowadays the dominant technology used in pressure driven water desalination systems. Despite offering superior water permeation and salt selectivity, their surface properties, such as their charge and roughness, cannot be extensively tuned due to the intrinsic fabrication process of the membranes by interfacial polymerization. The alteration of these properties would lead to a better control of the materials surface zeta potential, which is critical to finely tune selectivity and enhance the membrane materials stability when exposed to complex industrial waste streams. Low pressure plasma was employed to introduce amine functionalities onto the PA surface of commercially available thin-film composite (TFC) membranes. Morphological changes after plasma polymerization were analyzed by SEM and AFM, and average surface roughness decreased by 29%. Amine enrichment provided isoelectric point changes from pH 3.7 to 5.2 for 5 to 15 min of plasma polymerization time. Synchrotron FTIR mappings of the amine-modified surface indicated the addition of a discrete 60 nm film to the PA layer. Furthermore, metal affinity was confirmed by the enhanced binding of silver to the modified surface, supported by an increased antimicrobial functionality with demonstrable elimination of E. coli growth. Essential salt rejection was shown minimally compromised for faster polymerization processes. Plasma polymerization is therefore a viable route to producing functional amine enriched thin-film composite PA membrane surfaces.
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Affiliation(s)
- Rackel Reis
- †Institute for Sustainability for Innovation, College of Engineering and Science, Victoria University, Hoppers Lane, Werribee, Victoria 3030, Australia
| | - Ludovic F Dumée
- ‡Institute for Frontier Materials, Deakin University, Pigdons Road, Waurn Ponds,Victoria 3216, Australia
| | - Li He
- ‡Institute for Frontier Materials, Deakin University, Pigdons Road, Waurn Ponds,Victoria 3216, Australia
| | - Fenghua She
- ‡Institute for Frontier Materials, Deakin University, Pigdons Road, Waurn Ponds,Victoria 3216, Australia
| | - John D Orbell
- †Institute for Sustainability for Innovation, College of Engineering and Science, Victoria University, Hoppers Lane, Werribee, Victoria 3030, Australia
| | - Bjorn Winther-Jensen
- §Faculty of Engineering, Monash University, Bayview Avenue, Clayton, Victoria 3800, Australia
| | - Mikel C Duke
- †Institute for Sustainability for Innovation, College of Engineering and Science, Victoria University, Hoppers Lane, Werribee, Victoria 3030, Australia
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36
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Zhao F, Xu K, Ren H, Ding L, Geng J, Zhang Y. Combined effects of organic matter and calcium on biofouling of nanofiltration membranes. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.03.032] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Rezzadori K, Veneral JG, Silveira JCM, Penha FM, Petrus JCC, Prádanos P, Palacio L, Hernández A, Di Luccio M. Effect of dense CO2 on polymeric reverse osmosis and nanofiltration membranes and permeation of mixtures of macauba oil (Acrocomia aculeata) and CO2. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2014.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Heffernan R, Habimana O, Semião AJC, Cao H, Safari A, Casey E. A physical impact of organic fouling layers on bacterial adhesion during nanofiltration. WATER RESEARCH 2014; 67:118-28. [PMID: 25265304 DOI: 10.1016/j.watres.2014.09.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 09/05/2014] [Accepted: 09/06/2014] [Indexed: 05/16/2023]
Abstract
Organic conditioning films have been shown to alter properties of surfaces, such as hydrophobicity and surface free energy. Furthermore, initial bacterial adhesion has been shown to depend on the conditioning film surface properties as opposed to the properties of the virgin surface. For the particular case of nanofiltration membranes under permeate flux conditions, however, the conditioning film thickens to form a thin fouling layer. This study hence sought to determine if a thin fouling layer deposited on a nanofiltration membrane under permeate flux conditions governed bacterial adhesion in the same manner as a conditioning film on a surface. Thin fouling layers (less than 50 μm thick) of humic acid or alginic acid were formed on Dow Filmtec NF90 membranes and analysed using Atomic Force Microscopy (AFM), confocal microscopy and surface energy techniques. Fluorescent microscopy was then used to quantify adhesion of Pseudomonas fluorescens bacterial cells onto virgin or fouled membranes under filtration conditions. It was found that instead of adhering on or into the organic fouling layer, the bacterial cells penetrated the thin fouling layer and adhered directly to the membrane surface underneath. Contrary to what surface energy measurements of the fouling layer would indicate, bacteria adhered to a greater extent onto clean membranes (24 ± 3% surface coverage) than onto those fouled with humic acid (9.8 ± 4%) or alginic acid (7.5 ± 4%). These results were confirmed by AFM measurements which indicated that a considerable amount of energy (10(-7) J/μm) was dissipated when attempting to penetrate the fouling layers compared to adhering onto clean NF90 membranes (10(-15) J/μm). The added resistance of this fouling layer was thusly seen to reduce the number of bacterial cells which could reach the membrane surface under permeate conditions. This research has highlighted an important difference between fouling layers for the particular case of nanofiltration membranes under permeate flux conditions and surface conditioning films which should be considered when conducting adhesion experiments under filtration conditions. It has also shown AFM to be an integral tool for such experiments.
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Affiliation(s)
- R Heffernan
- School of Chemical and Bioprocess Engineering, University College Dublin, Co. Dublin, Ireland
| | - O Habimana
- School of Chemical and Bioprocess Engineering, University College Dublin, Co. Dublin, Ireland
| | - A J C Semião
- School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - H Cao
- School of Chemical and Bioprocess Engineering, University College Dublin, Co. Dublin, Ireland
| | - A Safari
- School of Chemical and Bioprocess Engineering, University College Dublin, Co. Dublin, Ireland
| | - E Casey
- School of Chemical and Bioprocess Engineering, University College Dublin, Co. Dublin, Ireland.
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Zhang Y, Liu G, Yu S, Zhang J, Tang Y, Li P, Ren Y. Kinetics and interfacial thermodynamics of the pH-related sorption of tetrabromobisphenol A onto multiwalled carbon nanotubes. ACS APPLIED MATERIALS & INTERFACES 2014; 6:20968-20977. [PMID: 25403011 DOI: 10.1021/am505730f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Surface functionalization of multiwalled carbon nanotubes (MWCNTs) was performed using mixed acid and ethylenediamine. The materials were characterized by electron microscope, X-ray diffraction, Raman spectra, Fourier transform infrared, N2 adsorption-desorption, and X-ray photoelectron spectroscopy. The pH-dependent sorption of tetrabromobisphenol A (TBBPA) onto raw and functionalized MWCNTs was investigated. A decrease in TBBPA uptake was found to be dependent on the adsorptive pKa in alkaline conditions. Two types of MWCNTs exhibited rapid binding kinetics for TBBPA sorption within 20 min. The kinetics of TBBPA sorption onto MWCNTs were analyzed using a pseudo-second-order model, an intraparticle diffusion model and Boyd model. The results showed that TBBPA sorption on MWCNTs and N-MWCNTs could be well described by the pseudo-second-order model, and the external diffusion (boundary layer diffusion) was the rate-limiting step. The extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory was applied to calculate interfacial free energies and to explain the sorption characteristics between the sorbent and solute. This analysis revealed that hydrophobic attractive interactions (i.e., interfacial AB interactions) were dominant in TBBPA sorption onto MWCNTs.
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Affiliation(s)
- Yunhai Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University , Shanghai 200092, China
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Semião AJC, Habimana O, Casey E. Bacterial adhesion onto nanofiltration and reverse osmosis membranes: effect of permeate flux. WATER RESEARCH 2014; 63:296-305. [PMID: 25016321 DOI: 10.1016/j.watres.2014.06.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 06/20/2014] [Accepted: 06/22/2014] [Indexed: 06/03/2023]
Abstract
The influence of permeate flux on bacterial adhesion to NF and RO membranes was examined using two model Pseudomonas species, namely Pseudomonas fluorescens and Pseudomonas putida. To better understand the initial biofouling profile during NF/RO processes, deposition experiments were conducted in cross flow under permeate flux varying from 0.5 up to 120 L/(h m(2)), using six NF and RO membranes each having different surface properties. All experiments were performed at a Reynolds number of 579. Complementary adhesion experiments were performed using Pseudomonas cells grown to early-, mid- and late-exponential growth phases to evaluate the effect of bacterial cell surface properties during cell adhesion under permeate flux conditions. Results from this study show that initial bacterial adhesion is strongly dependent on the permeate flux conditions, where increased adhesion was obtained with increased permeate flux, until a maximum of 40% coverage was reached. Membrane surface properties or bacterial growth stages was further found to have little impact on bacterial adhesion to NF and RO membrane surfaces under the conditions tested. These results emphasise the importance of conducting adhesion and biofouling experiments under realistic permeate flux conditions, and raises questions about the efficacy of the methods for the evaluation of antifouling membranes in which bacterial adhesion is commonly assessed under zero-flux or low flux conditions, unrepresentative of full-scale NF/RO processes.
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Affiliation(s)
| | - Olivier Habimana
- School of Chemical and Bioprocess Engineering, University College Dublin (UCD), Ireland
| | - Eoin Casey
- School of Chemical and Bioprocess Engineering, University College Dublin (UCD), Ireland.
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Habimana O, Semião AJC, Casey E. Upon impact: the fate of adhering Pseudomonas fluorescens cells during nanofiltration. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:9641-9650. [PMID: 25072514 DOI: 10.1021/es500585e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nanofiltration (NF) is a high-pressure membrane filtration process increasingly applied in drinking water treatment and water reuse processes. NF typically rejects divalent salts, organic matter, and micropollutants. However, the efficiency of NF is adversely affected by membrane biofouling, during which microorganisms adhere to the membrane and proliferate to create a biofilm. Here we show that adhered Pseudomonas fluorescens cells under high permeate flux conditions are met with high fluid shear and convective fluxes at the membrane-liquid interface, resulting in their structural damage and collapse. These results were confirmed by fluorescent staining, flow cytometry, and scanning electron microscopy. This present study offers a "first-glimpse" of cell damage and death during the initial phases of bacterial adhesion to NF membranes and raises a key question about the role of this observed phenomena during early-stage biofilm formation under permeate flux and cross-flow conditions.
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Affiliation(s)
- Olivier Habimana
- School of Chemical and Bioprocess Engineering, University College Dublin (UCD) , Belfield, Dublin 4, Ireland
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Vanysacker L, Boerjan B, Declerck P, Vankelecom IFJ. Biofouling ecology as a means to better understand membrane biofouling. Appl Microbiol Biotechnol 2014; 98:8047-72. [DOI: 10.1007/s00253-014-5921-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 06/24/2014] [Accepted: 06/25/2014] [Indexed: 10/24/2022]
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Impact of conditioning film on the initial adhesion of E. coli on polysulfone ultrafiltration membrane. J IND ENG CHEM 2014. [DOI: 10.1016/j.jiec.2013.07.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Huang W, Chu H, Dong B. Understanding the fouling of algogenic organic matter in microfiltration using membrane-foulant interaction energy analysis: effects of organic hydrophobicity. Colloids Surf B Biointerfaces 2014; 122:447-456. [PMID: 25074503 DOI: 10.1016/j.colsurfb.2014.06.038] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 06/16/2014] [Accepted: 06/17/2014] [Indexed: 10/25/2022]
Abstract
Fouling caused by algogenic organic matter (AOM) in membrane filtration is a critical problem in algae-rich waters, and understanding fouling mechanisms, particularly by identifying the predominant membrane foulants, could have significant effects on algal fouling prediction and pretreatment. In this work, the fouling behavior of Aphanizomenon flos-aquae (APF)- and Anabaena flos-aquae (ANF)-AOM fractions was analyzed using the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory. The results show that the interfacial energy of membranes and foulants could be used for AOM membrane fouling analysis. The attractive energy was highest between the membrane and the neutral hydrophilic fractions (N-HPI) on clean membrane surfaces, followed by the energy associated with the hydrophobic fractions (HPO) and the transphilic fractions (TPI) in both of the AOMs; on the other hand, the negatively charged hydrophilic organics (C-HPI) in the APF-AOM suffered from repulsive interactions when nearing the membrane surface, which was consistent with their initial filtration flux. After the formation of an initial fouling layer on the membrane surface, membrane fouling was controlled mainly by the cohesion free energy between the approaching foulants and the foulants on the fouled membranes. In addition, it was observed that the interfacial energy between foulants was the dominant factor controlling membrane fouling in AOM filtration. Finally, the interfacial energies between the N-HPI fractions had the greatest effect on both APF-AOM and ANF-AOM membrane fouling.
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Affiliation(s)
- Weiwei Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Huaqiang Chu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
| | - Bingzhi Dong
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
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Habimana O, Semião A, Casey E. The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2013.11.043] [Citation(s) in RCA: 138] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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46
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Surface-modified reverse osmosis membranes applying a copolymer film to reduce adhesion of bacteria as a strategy for biofouling control. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2013.12.032] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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47
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Anand S, Singh D, Avadhanula M, Marka S. Development and Control of Bacterial Biofilms on Dairy Processing Membranes. Compr Rev Food Sci Food Saf 2013; 13:18-33. [PMID: 33412692 DOI: 10.1111/1541-4337.12048] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 10/13/2013] [Indexed: 12/13/2022]
Abstract
Membrane fouling is a major operational problem that leads to reduced membrane performance and premature replacement of membranes. Bacterial biofilms developed on reverse osmosis membranes can cause severe flux declines during whey processing. Various types of biological, physical, and chemical factors regulate the formation of biofilms. Extracellular polymeric substances produced by constitutive microflora provide an effective barrier for the embedded cells. Cultural and microscopic techniques also revealed the presence of biofilms with attached bacterial cells on membrane surfaces. Presence of biofilms, despite regular cleaning processes, reflects ineffectiveness of cleaning agents. Cleaning efficiency depends upon factors such as pH of the cleaning agent, temperature, pressure, cleaning agent dose, optimum cleaning time, and cross-flow velocity during cleaning. Among different cleaning agents, surfactants help to prevent bacterial attachment to surfaces by reducing the surface tension of water and interfacial tension between the layers. Enzymes mixed with surfactants and chelating agents can be used to penetrate the biofilm matrix formed by microbes. Recent studies have shown the role of quorum-sensing-based cell-to-cell signaling, which provides communication within bacterial cells to form a mature biofilm, and also the role of applying quorum inhibitors to prevent biofilm formation. Major cleaning applications are also summarized in Table .
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Affiliation(s)
- Sanjeev Anand
- Midwest Dairy Foods Research Center, Dairy Science Dept., South Dakota State Univ., Brookings, SD 57007, U.S.A
| | - Diwakar Singh
- Midwest Dairy Foods Research Center, Dairy Science Dept., South Dakota State Univ., Brookings, SD 57007, U.S.A
| | - Mallika Avadhanula
- Midwest Dairy Foods Research Center, Dairy Science Dept., South Dakota State Univ., Brookings, SD 57007, U.S.A
| | - Sowmya Marka
- Midwest Dairy Foods Research Center, Dairy Science Dept., South Dakota State Univ., Brookings, SD 57007, U.S.A
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48
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Interaction energy evaluation of the role of solution chemistry and organic foulant composition on polysaccharide fouling of microfiltration membrane bioreactors. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2013.10.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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50
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Li Z, Tian Y, Ding Y, Wang H, Chen L. Contribution of extracellular polymeric substances (EPS) and their subfractions to the sludge aggregation in membrane bioreactor coupled with worm reactor. BIORESOURCE TECHNOLOGY 2013; 144:328-336. [PMID: 23891833 DOI: 10.1016/j.biortech.2013.06.127] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 06/27/2013] [Accepted: 06/29/2013] [Indexed: 06/02/2023]
Abstract
This study focused on the effect of predated sludge recycle on the contribution of extracellular polymeric substances (EPSs) and their subfractions to sludge aggregation in combined MBR system. It was observed that aggregation abilities of sludge samples were decreased by worm predation. Furthermore, worm predation enhanced the energy barriers and weakened the secondary energy minimum in the interaction energy profiles of slime, loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS). Further investigations demonstrated that the content decrease and structural change of different EPS fractions induced by worm predation may be the reason for the decreased aggregation of sludge. Concomitantly, the adsorption tests and atomic force microscopy observation confirmed that the worm predation decreased the adsorption of slime, LB-EPS and TB-EPS on membrane. This would indicate the worm predation could keep an optimum EPS level for which floc structure was maintained and the fouling propensity of mixed liquid was reduced.
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Affiliation(s)
- Zhipeng Li
- School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
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