混凝/PAC/超滤工艺去除水中天然有机物的研究

在饮用水处理过程中如何去除天然有机物是一个亟待解决的问题。混凝能降低水中污染物的浓度,避免这些物质进入膜孔内部,改善沉积在膜表面滤饼层的过滤性能和水中颗粒、胶体的迁移性能,提高膜通量。投加粉末活性炭(PAC)吸附溶解性有机物,利用超滤(UF)膜截留粉末炭,可达到提高出水水质的目的,还能防止膜污染。试验结果表明,混凝/PAC/UF组合工艺对水中UV254、UV410、TOC有较好的去除效果,平均去除率分别为92%、95%、84%,同时能改善膜透水通量、降低膜的吸附阻力、延长过滤周期、有效减少膜污染。

Removal of Natural Organic Matter in Water by Coagulation/PAC/ Ultrafiltration Process

The presence of natural organic matter(NOM) in potable water is an urgent concern.Coagulation was used to reduce the concentration of contaminants in water,prevent contaminants reaching past the membrane,modify the filtration property of the filter cake and the transport property of the colloid particle,and enhance the membrane flux.PAC was used to adsorb dissolved organic matter,and UF was used to reject PAC to improve water quality and prevent membrane fouling.The results showed that the combined process of coagulation,PAC and UF obtained good removal effect on UV254,UV410 and TOC.The corresponding removal rates were 92%,95% and 84%,respectively.The membrane flux was modified,the membrane resistance was decreased,the filtration period was prolonged,and the membrane fouling was effectively reduced.