在处理以地表水为水源的沉淀池出水时,超滤技术存在产水率较低的问题,反洗水的回收可以有效地提高系统的产水率和降低运行成本.试验设计了两套小试微滤膜系统,将膜反洗水经过预处理后按1:9比例与滦河水混合作为一套小试膜系统进水,另外一套小试膜系统处理滦河水.试验考察了两种预处理方式对于混配水膜系统的出水水质及膜污染的影响.结果表明,在膜反洗水中投加混凝剂和粉末活性炭(PAC)后,相对仅投加混凝剂的预处理方式,混配水系统的出水水质得到改善,UV254和CODMn的去除率分别提高了9%和6.3 %,预处理方式对于混配水系统出水浊度没有影响,比通量衰减速率降低了16.6%.在反洗水经混凝和PAC吸附后,混配水和滦河水系统出水水质与膜污染状况未见显著差异.%A low recovery rate was observed in the treatment of finished water from sedimentation tank with a UF membrane system, and recovery of membrane backwash water can improve productivity and reduce the cost of membrane treatment systems. In this study, two bench-scale coagulation microfiltration membrane systems were installed. The raw water of one membrane system was a blend of water from the pre-treated membrane backwash water and Luan River water in a 1 ∶ 9 ratio. Another membrane system was used to treat Luan River water. The aim of this study was to investigate effect of various pre-treatments on the finished water quality and membrane fouling rate. The results showed that the produced water quality from the mixed water system was improved with the addition of PAC in the pre-treatment of membrane backwash water, which was compared to the results obtained by coagulation. The removal rates of UV254 and CODMn were increased by 9% and 6. 3% , respectively. There was no difference in turbidity of the produced waters by the various pre-treatments. Moreover, attenuation rate of SF was reduced by 16.6% with adding PAC in the pre-treatment. And the produced water quality from Luan River water system and membrane fouling rate were similar to those in mixed water system when the PAC was added in the pre-treatment.
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