混凝/吸附预处理对超滤膜过滤特性的影响

采用混凝和吸附两种方法预处理模拟微污染地表水，研究了不同水样的污染物指标与超滤膜污染的关系，分析了颗粒物特性对超滤膜通量的影响. 试验结果表明:粉末活性炭吸附能够有效降低水中有机物浓度，但是对于浊度去除效果不明显；混凝对于有机物去除效果较差，但能明显降低水中浊度. 混凝预处理能够有效提高膜通量，但吸附对膜通量没有影响. 不同水样的膜污染指数与浊度及溶解性有机物（DOC）的相关性拟合表明，膜污染指数与浊度性相关性较好，与DOC相关性较差，水中浊度物质是试验条件下膜污染的主要物质；0.01~1.20μm的胶体和颗粒物是造成膜通量下降的主要因素，同时，浊度物质造成的膜污染指数具有良好的累积性. 

Effect of Coagulation/Adsorption Pretreatment on Ultrafiltration Characteristics

Two methods of coagulation and adsorption were used to pretreat a simulated micro-polluted ground water to study the relationship between ultrafiltration (UF) membrane and pollution levels of different water samples and analyze the effect of particles characteristics on flux decline. The experimental results indicate that powdered activated carbon could reduce the concentration of organics effectively, but the effect of wiping out turbidity is not obvious. Coagulation could reduce the turbidity of water effectively although it has low efficiency on organics removal. The coagulation pretreatment could improve the flux of raw water, but the adsorption has no influence on flux. The correlation fitting results of fouling index of turbidity and dissolved organic matter (DOC) show that fouling index of UF has an obvious correlation with turbidity, but no obvious correlation could be found with DOC concentration. The turbidity-causing pollutants are the major foulant under experimental condition. The colloidal and particles sized between 0.01μm and 1.2μm are the main pollutant which lead to flux decline, meanwhile, it is cumulatively on fouling index for turbidity-causing pollutants during UF process.