甜菜碱接枝复合膜在FOMBR中的膜污染研究  

Fouling Behavior of Betaine,grafted Thin,film Composite Membrane in Forward Osmosis Membrane Bioreactor

作　　者：刘彩虹 刘乾亮 宋丹 林旭 聂铮 周艺凡 何强[1] 马军 庞雪玲 刘浪[1] LIU Cai-hong;LIU Qian-liang;SONG Dan;LIN Xu;NIE Zheng;ZHOU Yi-fan;HE Qiang;MA Jun;PANG Xue-ling;LIU Lang(Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment,College of Environment and Ecology,Chongqing University,Chongqing 400045,China;School of Chemical and Environmental Engineering,Harbin University of Science and Technology,Harbin 150040,China;State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090.China;North China Municipal Engineering Design&Research Institute,Tianjin 300381,China)

机构地区：[1]重庆大学环境与生态学院三峡库区生态环境教育部重点实验室,重庆400045 [2]哈尔滨理工大学化学与环境工程学院,黑龙江哈尔滨150040 [3]哈尔滨工业大学环境学院城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090 [4]中国市政工程华北设计研究总院有限公司,天津300381

出　　处：《中国给水排水》2022年第3期35-42,共8页China Water & Wastewater

基　　金：国家自然科学基金青年基金资助项目(52100024);哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金资助项目(QAK202111);国家重点研发计划项目(2018YFC1903203);重庆市技术创新与应用发展专项重点项目(cstc2019jscx-tjsbX0002);黑龙江省博士后科研启动资助金项目(LBH-Q18066);污染控制与资源化研究国家重点实验室开放基金资助项目(PCRRF19038)。

摘　　要：正渗透膜生物反应器(FOMBR)凭借其比传统膜生物反应器(MBR)更好的出水水质、更低的工艺能耗以及更小的膜污染趋势,受到越来越多的关注。然而,无法避免的膜污染仍是制约FOMBR推广应用的关键问题。为此,采用典型两性离子聚合物——聚磺酸甜菜碱(pSBMA)对FOMBR中常用的聚酰胺复合膜(TFC膜)进行抗污染改性。研究表明,pSBMA在膜表面的接枝形成了一层较为致密的聚合物层,可显著提高膜表面的亲水性,接触角较原膜降低了47%。在FOMBR运行过程中,与TFC膜相比,TFC-pSBMA改性膜的通量衰减明显减缓,当过膜水量为800 mL时,通量衰减降低26%,pSBMA的存在可使膜表面与污染物间的作用力降低61%,表现出显著的抗污染特性。TFC-pSBMA改性膜的耐污性归因于改性对膜表面亲水性的提高、粗糙度的降低、荷电性的压缩,以及膜表面羧基浓度降低对架桥作用的削弱等综合作用。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.

关 键 词：正渗透膜生物反应器 聚酰胺复合膜 抗污染性 甜菜碱 

分 类 号：TU992[建筑科学—市政工程]