三种有机物对超滤膜污染的界面作用研究  

Interface Effect of Three Organic Matters on Ultrafiltration Membrane Fouling

作　　者：高伟[1] 梁恒[2] 李圭白[1,2] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090 [2]城市水资源开发利用<北方>国家工程研究中心,黑龙江哈尔滨150090

出　　处：《中国给水排水》2013年第9期66-69,共4页China Water & Wastewater

基　　金：佛山市院市合作项目(2011BY100291);禅城区产学研项目(2011B1031)

摘　　要：对腐殖酸、多糖类物质、蛋白质类物质所引起的超滤膜初期污染进行了比较,并对有机物和超滤膜的Zeta电位、接触角进行了测试,进而依据扩展DLVO(XDLVO)理论分析了三种有机物与超滤膜之间的界面自由能和界面作用力,并解释了三种有机物在相同运行条件下造成不同膜通量下降的相关机制。研究表明,三种有机物与超滤膜之间均存在较强的双电层斥力,但范德华力和酸碱力则各不相同。总界面力的作用范围不同是海藻酸钠形成较强膜污染的主要原因;蛋白质和腐殖酸与超滤膜之间总界面力的作用范围相当,但蛋白质与超滤膜之间相对较小的双电层斥力势垒可能是蛋白质相对腐殖酸更易造成膜污染的原因。应用XDLVO对超滤膜污染机制的研究会为膜污染控制策略的选择提供一定的理论依据。The initial ultrafiltration （UF） membrane fouling caused by humic acid, polysaccha- rides and proteins was compared. The Zeta potential and contact angle of the organic matters and the UF membrane were determined. Extended DLVO theory was adopted to analyze the cohesion energy and in- terface forces between each type of organic matter and UF membrane. The mechanisms for different mem- brane flux declines caused by the organic matters under the same operation condition were explained. A strong electrical double layer repulsion existed between the organic matters and the UF membrane, but the LW energy and acid-base energy differed. The different effective ranges of the total interface forces were the main mechanism for strong membrane fouling caused by sodium alginate. The same effective ran- ges of the total interface forces applied to protein, humic acid and membrane fouling. Compared with hu- mic acid, protein easily caused membrane fouling because of the small repulsive force barrier between protein and UF membrane. Understanding the membrane fouling mechanism by XDLVO theory will bene- fit the choice of the fouling control strategy.

关 键 词：有机物 超滤膜 膜污染 界面作用 

分 类 号：X703[环境科学与工程—环境工程]