中文摘要：

以聚合氯化铝作为混凝剂，通过中试考察了在线混凝对浸没式超滤膜出水水质和膜污染的影响，并与原水直接超滤和水厂现有常规处理工艺出水水质进行了对比．结果表明，在线混凝对浸没式超滤膜对浊度和微生物的去除没有影响，原水直接超滤和在线混凝一超滤出水浊度均低于0．1NTU，出水细菌总数均不超过5CFU／mL；与原水直接超滤相比，混凝剂投量为20和30mg／L时，在线混凝一超滤工艺对CODMn的去除率分别提高了8．1％和14．3％，对UV254的去除率分别提高了19．4％和26．5％；与原水直接超滤相比，在线混凝一超滤工艺在混凝剂投量低于水厂常规处理投加量的条件下即可明显减缓膜污染，进一步提高混凝剂投量对膜污染改善无明显影响．

英文摘要：

The effect of in-line coagulation on treated water quality and membrane fouling for immersed uhrafiltration （UF） was investigated in pilot-scale study using polyaluminium chloride as the coagulant, and the effluent water quality from the hybrid process was compared with that by direct UF and that by the conventional treatment process in an existing water treatment plant. According to the experiments, the removal efficiency for turbidity and pathogens of the immersed-UF was not affected by in-line coagulation, the effluent turbidity of direct UF and the hybrid UF process were both lower than 0. 1 NTU and the total bacteria count were both no more than 5 CFU/mL. Compared with direct UF of raw water, the removal efficiency of the hybrid UF process for CODMn increased 8. 1% and 14. 3% , respectively, with the coagulant dosage of 20 mg/L and 30 mg/L and that for UV254 increased 19.4% and 26.5%, respectively. Compared with direct UF of raw water, in-line coagulation with fewer dosages of coagulant than conventional treatment process can effectively mitigate membrane fouling, and higher coagulant dosage cannot improve membrane fouling better.