膜科学与技术

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Research on the preparation and the antifouling performance of Quaternary Ammonium zwitterion ceramic composite membrane

Authors： QIN Qiqing，WANG Rui, YOU Hong, XIE Binghan,TAN Haili, LIU Feng,LI Zhipeng

Units： 1. Harbin Institute of Technology(Weihai), School of Marine Science and Technology, 264209, China; 2. Harbin Institute of Technology, State Key Laboratory of Urban Water Resource and Environment, Harbin 150090, China

KeyWords： zwitterionic, ceramic membrane, antifouling performance, siloxane, sol-gel

ClassificationCode：X703.1

year,volume(issue):pagination： 2022,42(5):102-112

Abstract：

Using 3-Aminopropyltrimethoxysilane (KH551), 3-Glycidyloxypropyltrimethoxysilanen (KH560) as substrates, the siloxane sol containing tertiary amino was synthesized and coated on the ceramic membrane. The Quaternary Ammonium Salt-Zwitterion composite ceramic membrane was prepared by reacting with sodium 2-bromoethyl sulfonate (SBTS) for retarding the fouling in the MBR system. The surface properties, permeability, biofouling and organic fouling resistance of the modified membrane were characterized. The results showed that the quaternary ammonium salt was successfully grafted onto the surface of the membrane. After optimization, the contact angle of the modified membrane was about 39.4 °, and the flux was almost unaffected by gelation. The results of static adsorption experiment showed that the adsorption of live bacteria decreased by 90.6 % after modified, and the flux increased by at least 8.2 %. Taking soluble microbial products (SMP) and loosely bound extracellular polymeric substances (LB-EPS) in sludge as organic fouling models, the flux changes of the membrane were characterized through SMP and LB-EPS solutions, the fouling mechanism was analyzed by Hermia model, and the adhesion of fouling to the membrane surface was observed by CLSM. The results showed when SMP and LB-EPS were filtered to stable flux, the specific flux of modified membrane was 38.9 % and 29.3 % higher than primary membrane, the flux after backwashing was increased by 11.6 % and 32.3 %, and the attached fouling on the surface of modified membrane were reduced by 27.2 % and 41.5 % respectively. The above results indicate the surface modification by Quaternary Ammonium Salt-Zwitterion can effectively improve the antifouling performance of ceramic membrane.

Funds：

项目来源 “山东省自然科学基金项目”(ZR2019QEE012)

AuthorIntro：

覃琦清 (1997—)，男，硕士研究生，广西柳州人，研究方向为水污染控制，E-mail:qqq13307729990@163.com

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