新型PDMS相转化膜在萃取膜生物反应器中的应用  

APPLICATION OF NOVEL PDMS PHASE INVERSION MEMBRANE IN EXTRACTIVE MEMBRANE BIOREACTOR

作　　者：任龙飞[1] 徐宇博 邵嘉慧[1] REN Long-fei;XU Yu-bo;SHAO Jia-hui(School of Environmental Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《环境工程》2021年第7期133-138,共6页Environmental Engineering

基　　金：国家自然科学基金(52000129,21737002);上海市青年科技英才扬帆计划(20YF1419500)。

摘　　要：萃取膜生物反应器(EMBR)可将难降解的苯酚高盐废水分离为易降解的低浓度苯酚废水,从而实现苯酚高盐废水的高效降解。针对EMBR中传统硅橡胶管式膜苯酚跨膜传质速率较慢的问题,研究采用相转化法直接制备聚二甲基硅氧烷(PDMS)薄膜,可同时实现苯酚高渗透性与无机盐高截留率。探究了萃取膜生物反应器中废水、微生物单元的流量、pH、温度等参数对苯酚跨膜传质与无机盐截留的影响,优化了EMBR运行条件,并探究了EMBR内微生物的苯酚降解能力及对苯酚跨膜传质的影响。研究发现EMBR最优运行条件:废水单元流量为0.17 L/h、pH值=5.1、温度为34℃;微生物单元流量为0.17 L/h、pH值=5.75、温度为30℃。投加微生物后,该EMBR的苯酚跨膜传质系数最高可达到(4.0~4.3)×10^(-7)m/s,苯酚去除率始终维持在100%,NaCl截留率高于99.9%。研究成果有助于解决EMBR应用推广的瓶颈,对我国水环境污染治理和水资源安全保障有积极意义。Extractive membrane bioreactor(EMBR)is an effective method to treat the refractory phenol saline wastewater,which could separate the phenol saline wastewater into low concentration phenol wastewater.Aimed to solve the issue of low phenol transmembrane mass transfer rate of silicone rubber tube in EMBR,novel polydimethylsiloxane(PDMS)membrane was developed in this study using phase inversion method,which could simultaneously achieve high phenol transmembrane mass transfer and high NaCl rejection.Effects of flow rate,pH and temperature in wastewater and bioreactor on phenol separation and NaCl rejection were investigated to optimize the operation condition of EMBR.Effects of microorganisms on phenol degradation and transmembrane mass transfer were also investigated.Results showed that the optimal conditions for wastewater and bioreactor were flow rates of 0.17 L/h and 0.17 L/h,pH values of 5.1 and 5.75,temperatures of 34℃ and 30℃,respectively.After addition of sludge,transmembrane phenol mass transfer coefficients of 4.0×10^(-7)~4.3×10^(-7)m/s,phenol removal efficiencies around 100% and NaCl rejection efficiencies above 99.9% could be achieved in this EMBR.This study was beneficial in solving the key problems in application and popularization of EMBR,and was of great importance in the pollution treatment of water environment and security guarantee of water resource.

关 键 词：苯酚高盐废水 萃取膜生物反应器 聚二甲基硅氧烷 相转化膜 跨膜传质 

分 类 号：X703[环境科学与工程—环境工程]