LIUCai-hong,LIUQian-liang,SONGDan,et al.Fouling Behavior of Betaine-grafted Thin?film Composite Membrane in Forward Osmosis Membrane Bioreactor[J].China Water & Wastewater,2022,38(No.3):35-42.
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Fouling Behavior of Betaine-grafted Thin?film Composite Membrane in Forward Osmosis Membrane Bioreactor

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: No.第3 Page: 35-42 Column: Date of publication: 2022-02-01
Author(s):
LIU　Cai-hong1;  LIU　Qian-liang2;  SONG　Dan3;  LIN　Xu1;  NIE　Zheng1;  ZHOU　Yi-fan1;  HE　Qiang1;  MA　Jun3;  PANG Xue-ling4;  LIU Lang1
（1. Key Laboratory of the Three Gorges Reservoir Region’s Eco?Environment ， College of Environment and Ecology， Chongqing University， Chongqing 400045， China； 2. School of Chemical and Environmental Engineering， Harbin University of Science and Technology， Harbin 150040， China； 3. State Key Laboratory of Urban Water Resource and Environment， School of Environment， Harbin Institute of Technology， Harbin 150090， China；4. North China Municipal Engineering Design & Research Institute， Tianjin 300381， China）
Keywords:
forward osmosis membrane bioreactor;  polyamide thin?film composite membrane;  anti?fouling;  betaine
Abstract:
Forward osmosis membrane bioreactor (FOMBR) has attracted increasing attention due to its better effluent quality, lower energy consumption and less membrane fouling potential than traditional membrane bioreactor (MBR). However, the inevitable membrane fouling is still a key problem restricting the popularization and application of FOMBR. Therefore, the polyamide thin-film composite (TFC) membrane commonly used in FOMBR was modified by the zwitterionic polymer polysulfobetaine (pSBMA). The grafting of pSBMA on the membrane surface formed a dense polymer layer, which significantly improved the hydrophilicity of the membrane surface and reduced the contact angle by 47% compared with the original membrane. During FOMBR operation, flux decline of the modified TFC-pSBMA membrane was significantly slower than that of TFC membrane, and it decreased by 26% after collecting 800 mL of permeate water. The presence of pSBMA reduced the force between the membrane surface and foulants by 61%, showing a significant anti-fouling resistance. The anti-fouling property of the modified TFC-pSBMA membrane was attributed to the comprehensive effects of membrane hydrophilicity enhancement, membrane roughness reduction, surface charge compression and decreased bridging effect induced by low carboxylic group concentration on the membrane surface.
Last Update: 2022-02-01