混凝对膜污染的防止作用  

Effect of Coagulation on Preventing Membrane from Fouling

作　　者：董秉直[1] 陈艳[1] 高乃云[1] 邓慧萍[1] 范瑾初[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《环境科学》2005年第1期90-93,共4页Environmental Science

基　　金：国家高技术研究发展计划 (863计划 )资助项目(2 0 0 2AA60 113 0 );国家科技攻关重大项目(2 0 0 3BA80 8A17)

摘　　要：研究了混凝改善膜通量和防止膜污染的效果 .结果表明 :直接过滤原水的情况下 ,反冲洗后的膜通量恢复仅为初始通量的 4 0 % ;而投加了混凝剂 4mg/L和 10mg/L(以Al计 )后 ,反冲洗后的通量得到了完全的恢复 .混凝防止膜污染取决于过滤过程在膜表面形成的滤饼层的性能 .在过滤混凝液的情况下 ,混凝能在膜表面形成滤饼层 ,从而有效地防止膜污染 ,而过滤上清液的情况下 ,无法为混凝去除的中性亲水性的有机物沉积在膜表面 ,造成膜污染 .In this experiment, the effects on improve of flux and prevention of membrane from fouling is studied. The results demonstrate that after backwashing, the flux was completely recovered by addition of 4mg/L and 10mg/L(as Al), while the flux was only 40% of initial flux without coagulation pretreatment. It is also observed that whether or not prevention of fouling by coagulation are depended on the characteristics of cake layer formed on membrane surface during membrane filtration. In the presence of filtration of coagulation floc suspension, coagulation can form cake layer on membrane surface, thus prevent membrane from fouling effectively, while in the presence of filtration of supernatant, fouling are occurred due to cake layer comprising small, neutral, hydrophilic compounds, which can not remove by backwash.

关 键 词：超滤膜 微污染原水 混凝 滤饼层 膜污染 

分 类 号：X703.1[环境科学与工程—环境工程]