【摘 要】
：
The purpose of this study is to understand the effect and mechanism of preventing membrane fouling,by coagulation pretreatment,in terms of fractional component
【机 构】
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State Key Laboratory of Pollution Control and Resource Reuse
【基金项目】
：
国家高技术研究发展计划(863计划);国家科技研究计划
论文部分内容阅读
The purpose of this study is to understand the effect and mechanism of preventing membrane fouling,by coagulation pretreatment,in terms of fractional component and molecular weight of natural organic matter(NOM).A relatively higher molecular weight(MW)of hydrophobic compounds was responsible for a rapid decline in the ultrafiltration flux.Coagulation could effectively remove the hydrophobic organics.resulting in the increase of flux.It was found that a lower MW of neutral hydrophilic compounds,which could remove inadequately by coagulation.was responsible for tlle slow declining flux.The fluxes in the filtration of coagulated water and supematant water were compared and the results showed that a lower MW of neutral hydrophilic compounds remained in the supernatant water after coagulation could be rejected by a membrane,resulting in fouling.It was also found that the coagulated flocs could absorb neutral hydrophilic compounds effectively.Therefore,with the coagulated flocs formed on the membrane surface,the flux decline could be improved.
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