The enhanced coagulation treatment effectiveness by using composite coagulants,polyferric sulfate (PFS)/polydimethyldiallylammonium chloride (PDM)with different intrinsic viscosities for autumn Yangtze river raw water have been investigated, through jar tests. The results show that when the temperature of autumn Yangtze river raw water is 16-18℃ and 57-62 NTU ,the turbidity removal efficiency of composite coagulants is remarkable. When the precipitated effluent residual turbidity standard 6 NTU at a Nanjing water plant is achieved,the PFS dosages could be decreased significantly. The lower the PFS/PDM composite ratio is,the higher the PDM intrinsic viscosity is, and the better the turbidity removal efficiency is. The PFS/PDM composite coagulant coagulation produces big floes,and rapid precipitation. Therefore,in actual production.it produces more effluent and improves productivity effect. In order to be suitable for the water quality requirements in the future,the PFS/PDM composite coagulant can still works well,if the effluent from the precipitation tank reaches 2 NTU or so.%通过混凝烧杯实验,考察了特征黏度系列化的聚合硫酸铁(PFS)/聚二甲基二烯丙基氯化铵(PDM)复合混凝剂在秋季长江水处理中的混凝处理效果.结果表明:对温度为16～18℃,浊度为57～62 NTU的秋季长江水,复合混凝剂脱浊效果明显,达到南京某水厂6 NTU的沉淀出水余浊标准时,可显著降低PFS的投加量,PFS/PDM复合配比越低,PDM特征黏度越大,脱浊效果越好；PFS/PDM复合混凝剂混凝产生絮团大,沉淀快,在实际生产中可增大出水产量,提高生产效率.为适应未来发展水质要求,使沉淀池出水达到2NTU左右,PFS/PDM复合混凝剂依然可发挥好的作用.
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