胞外聚合物对浸没式膜-生物反应器膜过滤性能的影响  

Effect of extracellular polymeric substances in SMBR on membrane filtration

作　　者：王雪梅[1] 刘燕[1] 华志浩[1] 郭国良[1] 

机构地区：[1]复旦大学环境科学与工程系,上海200433

出　　处：《环境科学学报》2005年第12期1602-1607,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金资助项目(No.20377010)~~

摘　　要：通过浸没式膜-生物反应器(SMBR)处理上海市城市内河水的试验,研究了反应器混合液中和2种疏水性不同的膜上污泥胞外聚合物(EPS)的量、组成、污泥特性及对膜过滤性能的影响.结果表明,混合液污泥中的溶解性EPS和固着性EPS比膜上污泥多,不同污泥的固着性EPS组分中蛋白质(EPSP)/多糖(EPSC)的大小顺序依次为混合液污泥<亲水膜污泥<疏水膜污泥.疏水膜污泥中溶解性EPS比亲水膜多,溶解性EPS和固着性EPS量及组分均有很大差异.混合液污泥的EPS流动性大,疏水性膜上污泥EPS的流动性较大.溶解性EPS对污泥特性及膜过滤性能影响较大.SMBR中亲、疏水性膜片上黏附的污泥的相对疏水性分别为53%、59%.比较2种膜片通量的变化发现,疏水性膜污染严重.This paper investigated the amount and composition of extracellular polymeric substances （EPS） in activated sludge from mixed liquor as well as those in sludges from a hydrophilic and a hydrophobic membrane, respectively, in a Submerged membrane bioreactor （SMBR） treating river water in Shanghai, and analyzed the characteristics of these sludges. The effect of EPS and sludge hydrophabicity on filtration of membrane was studied. The experiment results showed that total amount of EPS in sludge from mixed liquor was more than those from membrane surface, and the ratio of EPSp/EPSc ranked mixed liquor 〈 hydrophilic membrane 〈 hydrophohic membrane. The quantity and components of Soluble EPS and Bound EPS were different among three kinds of sludges. The quantity of Soluble EPS from hydrophohic membrane was more than that from hydrophilic membrane. EPS in sludge from mixed liquor was looser than those from the membrane surfaces. EPS in sludge from hydrophilic and hydrophobic membrane surface was tightly adhered to cell surfaces. Soluble EPS greatly affected membrane filtration. Relative hydrophobicity of sludge from hydrophilic and hydrophobic membrane surface was 53 % and 59% respectively. Comparison of flux revealed that hydrophohic membrane fouling was more serious than hydrophilic one, and the ability of anti-fouling of the latter was higher than that of the former.

关 键 词：浸没式膜-生物反应器 胞外聚合物 膜污染 亲水性膜 疏水性膜 

分 类 号：X703[环境科学与工程—环境工程]