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membrane fouling Alleviation by Chemically Enhanced Backwashing in Treating Algae-Containing Surface Water: From Bench-Scale to Full-Scale Application

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Engineering 2022年第12期19卷 40-49页

作者： Xiaobin Tang Tiecheng Guo Haiqing Chang Xiao Yue Jinlong Wang Haikuan Yu Binghan Xie Xuewu Zhu Guibai Li Heng Liang State Key Laboratory of Urban Water Resource and Environment(SKLUWRE) School of EnvironmentHarbin Institute of TechnologyHarbin 150090China College of Architecture and Environment Sichuan UniversityChengdu 610207China College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 100124China School of Marine Science and Technology Harbin Institute of Technology at WeihaiWeihai 264209China

Ultrafiltration(UF)has been increasingly implemented in drinking water treatment plants;however,algae and their secretions can cause severe membrane fouling and pose great challenges to UF in practice.In this study,a simple and practical chemically enhanced backwashing(CEB)process was developed to address such issues using various cleaning reagents,including sodium hypochlorite(NaClO),sodium chloride(NaCl),sodium hydroxide(NaOH),sodium citrate,and their combinations.The results indicate that the type of chemical played a fundamental role in alleviating the hydraulically irreversible membrane fouling(HIMF),with NaClO as the best-performing reagent,followed by NaCl.Furthermore,a CEB process using a combination of NaClO with NaCl,NaOH,or sodium citrate delivered little improvement in the alleviation of membrane fouling compared with NaClO alone.The optimized dosage and dosing frequency of NaClO were 10 mg·L^(-1) two times per day.Long-term pilot-scale and full-scale experiments further verified the feasibility of the CEB process in relieving algae-derived membrane fouling.Compared with the conventional hydraulic backwashing without chemical involvement,the CEB process can effectively remove the organic foulants including biopolymers,humic substances,and proteinlike substances by means of oxidization,thereby weakening the cohesive forces between the organic foulants and the membrane surface.Therefore,the CEB process can efficiently alleviate the algae-related membrane fouling with lower chemical consumption,and is proposed as an alternative to control membrane fouling in treating the algae-containing surface water.

关键词： Ultrafiltration membrane fouling Hydraulically irreversible membrane fouling Chemically enhanced backwashing(CEB) Algae-containing surface water

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Effects of different Ca^(2+) behavior patterns in the electric field on membrane fouling formation and removal of trace organic compounds

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Journal of Environmental Sciences 2022年第1期34卷 292-300页

作者： Zhen Du Min Ji Ruying Li School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China

The effects of Ca^(2+) on membrane fouling and trace organic compounds(TrOCs)removal in an electric field-assisted microfiltration system were investigated in the presence of Na^(+) alone for comparison.In the electric field,negatively charged bovine serum albumin(BSA)migrated towards the anode far away from the membrane surface,resulting in a 42.9%transmembrane pressure(TMP)reduction in the presence of Na^(+) at 1.5 V.In contrast,because of the stronger charge shielding of Ca^(2+),the electrophoretic migration of BSA was limited and led to a neglectable effect of the electric field(1.5 V)on membrane fouling.However,under 3 V applied voltage,the synergistic effects of electrochemical oxidation and bridging interaction between Ca^(2+) and BSA promoted the formation of denser settleable flocs and a thinner porous cake layer,which alleviated membrane fouling with a 64.5%decrease in TMP and nearly 100%BSA removal.The Tr OCs elimination increased with voltage and reached29.4%–80.4%at 3 V.The electric field could prolong the contact between Tr OCs and strong oxidants generated on the anode,which enhanced the Tr OCs removal.However,a stronger charge shielding ability of Ca^(2+) weakened the electric field force and thus lowered the Tr OCs removal.

关键词： Electric field membrane fouling Ca^(2+) Flocs formation Trace organic compounds

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Less pressure contributes to gravity-driven membrane ultrafiltration with greater performance:Enhanced driving efficiency and reduced disinfection by-products formation potential

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Journal of Environmental Sciences 2024年第3期137卷 407-419页

作者： Xiaoting Wu Yufei Li Zhaoyang Su Long Tian Muhammad Saboor Siddique Wenzheng Yu Colleges of Forestry Northeast Forestry UniversityHarbin 150040China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Gravity-driven membrane(GDM)systems have been well developed previously;however,impacts of driving(i.e.,transmembrane)pressure on their performance received little attention,which may infuence GDM performance.In this study,we evaluated 4 GDM systems via altering the transmembrane pressure from 50 mbar to 150 mbar with 2 groups,treating surface water in Beijing,China.Results showed that less driving pressure was more favorable.Specifically,compared to groups(150 mbar),groups under a pressure of 50 mbar were found to have greater normalized permeability and lower total resistance.During the whole operation period,the quality of effuents was gradually improved.For example,the removal efficiency of UV254was significantly improved;particularly,under low driving pressure,the removal efficiency of UV254in PES GDM system increased by 11.91%,as compared to the corresponding system under high driving pressure.This observation was consistent with the reduction on disinfection by-products(DBPs)formation potential;groups under 50 mbar achieved better DBPs potential control,indicating the advantages of lower driving pressure.Biofilms were analyzed and responsible for these differences,and distinct distributions of bacteria communities of two GDM systems under 50 and 150 mbar may be responsible for various humic-like substances removal efficiency.Overall,GDM systems under less pressure should be considered and expected to provide suggestions on the design of GDM systems in real applications.

关键词： Ultrafiltration Gravity driven operation membrane fouling Biofilms Disinfection by-products

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Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane fouling control

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 269-284页

作者： Xiaoman Liu Chang Tian Yanxia Zhao Weiying Xu Dehua Dong Kaimin Shih Tao Yan Wen Song School of Water Conservancy and Environment University of JinanJinan 250022China School of Environmental Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China School of Material Science and Engineering University of JinanJinan 250022China Department of Civil Engineering The University of Hong KongHong Kong 999077China

Application of ceramic membrane(CM)with outstanding characteristics,such as high flux and chemical-resistance,is inevitably restricted by membrane fouling.Coagulation was an economical and effective technology for membrane fouling control.This study investigated the filtration performance of ceramic membrane enhanced by the emerging titanium-based coagulant(polytitanium chloride,PTC).Particular attention was paid to the simulation of ceramic membrane fouling using four widely used mathematical models.Results show that filtration of the PTC-coagulated effluent using flat-sheet ceramic membrane achieved the removal of organic matter up to 78.0%.Permeate flux of ceramic membrane filtration reached 600 L/(m2$h),which was 10-fold higher than that observed with conventional polyaluminum chloride(PAC)case.For PTC,fouling of the ceramic membrane was attributed to the formation of cake layer,whereas for PAC,standard filtration/intermediate filtration(blocking of membrane pores)was also a key fouling mechanism.To sum up,cross-flow filtration with flat-sheet ceramic membranes could be significantly enhanced by titanium-based coagulation to produce both high-quality filtrate and high-permeation flux.

关键词： Ceramic membrane Coagulation Polytitanium chloride membrane fouling

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A critical review on thermodynamic mechanisms of membrane fouling in membrane-based water treatment process

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Frontiers of Environmental Science & Engineering 2023年第10期17卷 147-169页

作者： Jiaheng Teng Ying Deng Xiaoni Zhou Wenfa Yang Zhengyi Huang Hanmin Zhang Meijia Zhang Hongjun Lin Key Laboratory of Watershed Earth Surface Processes and Ecological Security College of Geography and Environmental SciencesZhejiang Normal UniversityJinhua 321004China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

membrane technology is widely regarded as one of the most promising technologies for wastewater treatment and reclamation in the 21st century. However, membrane fouling significantly limits its applicability and productivity. In recent decades, research on the membrane fouling has been one of the hottest spots in the field of membrane technology. In particular, recent advances in thermodynamics have substantially widened people’s perspectives on the intrinsic mechanisms of membrane fouling. Formulation of fouling mitigation strategies and fabrication of anti-fouling membranes have both benefited substantially from those studies. In the present review, a summary of the recent results on the thermodynamic mechanisms associated with the critical adhesion and filtration processes during membrane fouling is provided. Firstly, the importance of thermodynamics in membrane fouling is comprehensively assessed. Secondly, the quantitative methods and general factors involved in thermodynamic fouling mechanisms are critically reviewed. Based on the aforementioned information, a brief discussion is presented on the potential applications of thermodynamic fouling mechanisms for membrane fouling control. Finally, prospects for further research on thermodynamic mechanisms underlying membrane fouling are presented. Overall, the present review offers comprehensive and in-depth information on the thermodynamic mechanisms associated with complex fouling behaviors, which will further facilitate research and development in membrane technology.

关键词： membrane fouling Thermodynamic mechanism XDLVO theory Flory-Huggins theory fouling migration

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Multivariable identification of membrane fouling based on compacted cascade neural network

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Chinese Journal of Chemical Engineering 2023年第1期53卷 37-45页

作者： Kun Ren Zheng Jiao Xiaolong Wu Honggui Han Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Engineering Research Center of Digital Community Ministry of EducationBeijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing 100124China

The membrane fouling phenomenon,reflected with various fouling characterization in the membrane bioreactor(MBR)process,is so complicated to distinguish.This paper proposes a multivariable identification model(MIM)based on a compacted cascade neural network to identify membrane fouling accurately.Firstly,a multivariable model is proposed to calculate multiple indicators of membrane fouling using a cascade neural network,which could avoid the interference of the overlap inputs.Secondly,an unsupervised pretraining algorithm was developed with periodic information of membrane fouling to obtain the compact structure of MIM.Thirdly,a hierarchical learning algorithm was proposed to update the parameters of MIM for improving the identification accuracy online.Finally,the proposed model was tested in real plants to evaluate its efficiency and effectiveness.Experimental results have verified the benefits of the proposed method.

关键词： membrane fouling Permeability Cascade neural networks Model Prediction

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Unraveling membrane fouling Induced by Chlorinated Water Versus Surface Water:Biofouling Properties and Microbiological Investigation

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Engineering 2022年第8期8卷 154-164页

作者： Li Zhang Lei Xu Nigel Graham Wenzheng Yu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Department of Civil and Environmental Engineering Imperial College LondonSouth Kensington CampusLondon SW72AZUK

Chlorine is usually applied in the urban water treatment process to deactivate pathogens and prevent waterborne diseases.As a pre-treatment,it remains unclear whether chlorinated water can effectively alleviate membrane fouling during ultrafiltration(UF).In this study,tap water was investigated for its effect on biofilm formation and biofouling in a gravity-driven membrane(GDM)filtration system.For comparison,biofilm/biofouling with untreated surface(lake)water was studied in parallel.It was found that more severe membrane fouling occurred with the filtration of tap water than lake water,and larger quantities of polysaccharide and extracellular DNA(eDNA)were present in the tap-water biofilm than in the lake-water biofilm.The tap-water biofilm had a densely compact morphology.In contrast,a porous,spider-like structure was observed for the lake-water biofilm,which was assumed to be associated with the bacteria in the biofilm.This hypothesis was verified by 16S ribosomal RNA(rRNA)sequencing,which demonstrated that Xanthobacter was the dominant taxon in the tap-water biofilm.Additionally,membrane hydrophobicity/hydrophilicity played a minor role in affecting the membrane fouling properties and microbial community.This study revealed the significant role of chlorine-resistant bacteria in biofouling formation and provides a deeper understanding of membrane fouling,which can potentially aid in searching for effective ways of controlling membrane fouling.

关键词： membrane fouling Biofilm GDM filtration technology Ultrafiltration Chlorine-resistant bacteria Hydrophilicity

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Photocatalytic thin film composite forward osmosis membrane for mitigating organic fouling in active layer facing draw solution mode

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Chinese Chemical Letters 2023年第6期34卷 230-235页

作者： Yang Hu Pin Zhao Hao Liu Xiawen Yi Weilong Song Xinhua Wang Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

As a high-flux operation mode of thin film composite-forward osmosis(TFC-FO)membrane,active layer facing draw solution(AL-DS)mode suffers from the severe membrane fouling tendency,which is not addressed well.Here,we introduced a photocatalyst(Anatase titanium dioxide,A-TiO_(2))onto the support layer of TFC-FO membrane via the bonding of polydopamine(PDA)and polytetrafluoroethylene(PTFE),and prepared two photocatalytic membranes,A-TiO_(2)/PDA@TFC and A-TiO_(2)/PTFE@TFC.Compared with the pristine TFC-FO membrane,both A-Ti O_(2)/PDA@TFC and A-TiO_(2)/PTFE@TFC had an improved water permeability(10.5 L m^(-2)h^(-1)and 9.5 L m^(-2)h^(-1),respectively)and reduced reverse Na Cl flux salt(0.8 g m^(-2)h^(-1)and 0.7 g m^(-2)h^(-1),respectively)in the AL-DS mode using 1 mol/L Na Cl as draw solution and pure water as feed solution.Moreover,in the 16 h fouling experiment using 200 ppm bovine serum albumin(BSA)solution as a representative pollutant,the flux decline rate of both photocatalytic membranes was dramatically alleviated from 39.7%and 21.7%in the darkness to 8.5%and 9.7%under UV irradiation,respectively,indicating a significant anti-fouling capacity of photocatalytic effect.In all,the presence of A-TiO_(2)endowed membrane with high permeability,high rejection efficiency and excellent anti-fouling capacity under UV spotlight.As bonding agent,PTFE provided the modified membrane with a high photocatalytic effect and high self-cleaning capacity,while PDA increased the membrane permeability and protected membrane against photocatalytic damage.This work provides a simple and feasible method to improve the anti-fouling capacity of TFC-FO membrane in AL-DS mode.

关键词： Forward osmosis Photocatalysis membrane orientation membrane fouling Water permeation

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Microfiltration,ultrafiltration and nanofiltration as a post-treatment of biological treatment process with references to oil field produced water of Moran oilfield of Assam

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Petroleum Research 2024年第1期9卷 143-154页

作者： Amarjit Rajbongshi Subrata Borgohain Gogoi Brahmaputra Valley Fertilizer Corporation Limited NamrupAssamIndia Department of Petroleum Technology Dibrugarh UniversityAssamIndia

The selection of an apt technology for the treatment of Oilfield Produced Water(OFPW)depends mainly on the quality of OFPW and methods of pre-and post-treatment processes.The most challenging part of the OFPW treatment process is the removal of Suspended Solid(SS),Oil&Grease(O&G)and dissolved organics.SS and O&G pose an acute problem to the membrane filtration system by fouling the membrane surface which increases operation&maintenance costs and decreases the life of the membrane.fouling of the membrane surface is mainly attributed to the presence of low molecular weight aromatic compounds and naphthenic acids in the suspended and dissolved organic compounds.Thus,the removal of these suspended and dissolved organic compounds before membrane filtration proffers a challenge to the researchers.In this research,bioremediation process has been applied to remove the organic compounds and the performance and fouling behaviour of hollow fibre Microfiltration(MF),Ultrafiltration(UF)and Nanofiltration(NF)membranes after the bioremediation process has been analyzed in detail.The level of toxicity was determined by comparing the pollutants with the safe discharge limit for disposal into the environment set by Central Pollution Control Board(CPCB),India.The research presents its novelty by using a hydrocarbon-degrading bacteria,Pseudomonas aeruginosa for the Reduction of Organic Loads(ROL)from OFPW of Moran oil field of Upper Assam as a pre-treatment to membrane filtration.The Total Sum Corrected Area(TSCA)method through chromatographic analyses was used for this.The organic loads removal from OFPW by the TSCA method was found to be 67-100%,100%and 100%after 7,14 and 21 days of bioremediation respectively.The major parameters in feed OFPW of Moran oil field were found to be pH(7.5-9.3),Total Dissolved Solid(TDS)(1.79-4.75)ppt,O&G(1.78-2.8)ppt,Salinity(2.94-6.98)ppt,Chloride(Cl^(-))(1.6-3.86)ppt,Bicarbonate(HCO_(3)^(-))(2.89-4.03)ppt.It was observed that the ranges of pollutants removal by NF was highest such as TDS(26-86%),sa

关键词： Oilfield produced water Organic compounds Bioremediation membrane filtration membrane fouling

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A review on hollow fiber membrane module towards high separation efficiency:Process modeling in fouling perspective

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Chinese Chemical Letters 2022年第8期33卷 3594-3602页

作者： Xianhui Li Mohammad Younas Mashallah Rezakazemi Quang Viet Ly Jianxin Li Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China State Key Laboratory of Separation membranes and membrane Processes National Center for International Joint Research on Membrane Science and TechnologyTiangong UniversityTianjin 300387China Department of Chemical Engineering University of Engineering and TechnologyP.O.Box 814PeshawarPakistan Faculty of Chemical and Materials Engineering Shahrood University of TechnologyP.O.Box ***ShahroodIran Institute of Research and Development Duy Tan UniversityDa nang 550000Vietnam

Hollow fiber microfiltration(MF)and ultrafiltration(UF)membrane processes have been extensively used in water purification and biotechnology.However,complicated filtration hydrodynamics wield a negative influence on fouling mitigation and stability of hollow fiber MF/UF membrane processes.Thus,establishing a mathematical model to understand the membrane processes is essential to guide the optimization of module configurations and to alleviate membrane fouling.Here,we present a comprehensive overview of the hollow fiber MF/UF membrane filtration models developed from different theories.The existing models primarily focus on membrane fouling but rarely on the interactions between the membrane fouling and local filtration hydrodynamics.Therefore,more simplified conceptual models and integrated reduced models need to be built to represent the real filtration behaviors of hollow fiber membranes.Future analyses considering practical requirements including complicated local hydrodynamics and nonuniform membrane properties are suggested to meet the accurate prediction of membrane filtration performance in practical application.This review will inspire the development of high-efficiency hollow fiber membrane modules.

关键词： Hollow fiber microfiltration and ultrafiltration process Mathematical modeling Filtration hydrodynamics membrane fouling Optimization

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