不同原水中膜污染物质的表征与确定

本文采用有机物的组分分析、相对分子质量分布及三维荧光等分析手段,研究了青草沙水库和滆湖原水的膜过滤通量的表现,探讨了膜污染的机理.试验结果表明,中亲组分有机物造成的微滤膜和超滤膜的通量下降最为严重,而疏水性有机物对通量的影响甚微.滆湖水对微滤膜的通量下降较青草沙水库水严重,而青草沙水库水对超滤膜的通量下降较滆湖水严重.膜污染机理的分析表明,微滤膜污染主要由膜孔堵塞造成,而超滤膜的通量主要受大分子有机物形成的滤饼层的影响.三维荧光分析表明,蛋白质类的有机物是造成膜污染的主要物质.

Identification and characterization of membrane fouling substances in different raw water

This study investigated the behavior of membrane filtration for the raw waters of Qingcaosha reservoir and Gehu Lake to provide insight into mechanism of membrane fouling by means of various analyses of hydrophilicity/hydrophobicity fractions, HPSEC-UV-TOC and 3DEEM spectrum. The experimental results showed that neutral hydrophilic fraction caused most serious flux decline for both microfiltration (MF) and ultrafiltration (UF) while hydrophobic fraction gave slight reduction of flux. It was also found that the flux of MF declined more seriously for Gehu while the flux of UF declined more serious for Qingcaosha. It can be concluded that pore clogging was responsible for fouling of MF while cake layer formed by macromolecular caused fouling of UF. The analysis of 3DEEM demonstrated that the protein-like substances were mainly responsible for membrane fouling.