上海市YP水厂滤池反冲洗水回用生产性试验

Full-Scale Research on Recycling Filter Backwash Water in YP WTP in Shanghai City

我国近年在水资源利用方面实施“节水优先”的治水方针。水厂在净化水质过程中产生的废水总量占供水量的2%-10%。文中在比较水厂滤池反冲洗水和原水水质基础上,在上海市YP水厂开展了滤池反冲洗水回用生产试验。跟踪监测结果表明:滤池反冲洗水回用对混凝沉淀有微弱影响,导致沉淀池出水浑浊度、COD_(Mn)和氨氮略有升高,但滤后水不受影响;不会导致重有机物、重金属和两虫积累问题。试验结果表明,水厂回用滤池反冲洗水在水质上是可行的。

In recent years,China has implemented water conservation as the priority policy for water control in the utilization of water resources.Wastewater produced by the treatment processes during water purification accounts for 2%to 10%of the total water supply.In this paper,on the basis of comparing the water quality of filter backwash water and the raw water in the water treatment plant(WTP),the research on the full-scale application of the reuse of the filter backwash water was carried out in YP WTP in Shanghai City.Results tracked and monitored indicated that the reuse of the filter backwash water may impact the performance of coagulation and sedimentation.Turbidity,COD_(Mn)and ammonia nitrogen slightly increased in the effluents from the sedimentation process after the reuse.However,the filtered water was not affected where the accumulation of organic contaminants,heavy metals,as well as Giardia and Cryptosporidium were not observed.Results demonstrated that it is viable for the WTP to reuse the filter backwash water considering the water quality issue.