PAC-UF工艺处理沉淀池出水试验

利用粉末活性炭(PAC)和浸没式超滤膜组件联合处理净水厂沉淀池出水,并对处理前后水样的浊度、CODMn、UV254、TOC和三氯甲烷生成势进行检测.结果表明:PAC能够加强超滤膜对水中颗粒及胶体物质的控制,使出水的浊度保持在0.10NTU以下,去除率在95%以上;PAC能有效提高超滤工艺对有机物的去除能力,PAC的最佳投量在20～30mg/L;PAC和超滤膜联合使用还能去除三氯甲烷的前驱物,在投量为20～30mg/L时能降低23.9%～31.4%的三氯甲烷生成势.通过分析PAC投量对膜通量下降的影响可知,PAC投加可以降低膜污染,同时,PAC-UF工艺中形成的膜污染以粉末活性炭颗粒泥饼层为主,可以通过简单的水力反冲洗实现通量恢复。

Purification of the effluent of sedimentation with PAC-UF process

The effluent of sedimentation tank in water supply plant was dealt with by powdered activated carbon(PAC)-UF process,and the turbidity,CODMn,UV254,TOC and the trichloromathane formation potential of influent and effluent in PAC-UF process were measured.The results showed that the addtion of PAC could enhance the removal of particles and colloidal substances in water,which kept the turbidity of effluent lower than 0.1 NTU and the removal rate remaining above 95%.The addtion of PAC could improve the removal of organics in PAC-UF process and reduce 23.9%-31.4% trichloromethane formation potential with the optimum PAC dosage of 20-30 mg/L.It was also found that PAC could reduce membrane fouling,and the membrane fouling in PAC-UF process was mainly consist of PAC cake layer which could be easily removed by hydraulic backwashing.