超滤膜与不同处理工艺组合处理湖泊水的中试研究

为解决水厂现有净水工艺不能适应水源水质恶化的现状，采用国产超滤膜分别处理水厂的炭后水（工艺1）、滤后水（工艺2）和沉后水（工艺3），将超滤膜和水厂现有工艺结合，形成深度处理系统，研究超滤膜组合工艺的处理效能及超滤膜的过滤性能。研究表明：工艺1、工艺2和工艺3对CODMn的平均去除率分别为52．86％、39．62％和34．59％；DOC的平均去除率分别为33．08％、23．60％和18．55％，UV254去除率分别为57．14％，39．669／6和35．34％，藻类平均去除率分别为98．71％、97．84％和98．13％，3种工艺出水浊度均低于0．1NTU，颗粒物粒径〉2μm的颗粒物控制20个／mL以下。工艺1运行45d跨膜压差上升6．59％，产水率为98．02％；工艺2膜前加氯0．65mg／L时，水力冲洗后跨膜压差可有效恢复，稳定运行10d跨膜压差上升2．91％，产水率为97．63％；工艺3运行20d跨膜压差上升13．52％，其产水率为97．019／6。

Experimental Investigation of Ultrafiltration Membrane With Different Pretreatment technology for Lake Water

In order to solve the problems that the exiting technologies do not adapt to the deterioration of the water quality in the water plant, the ultrafiltration was used to treat water respectively from ozonebiological activated carbon pool （process 1）, sand filtration pool （process 2） and sedimentation tank （process 3） in the region of river network of southern China. It is found that the average DOC removal rate were 33.08%, 23.60%, and 18.55%, and the average alga removal are 98.71%, 97.84%, and 98.13% in the process 1, process2 and process3, respectively. The turbidity of the effluent is lower than 0. 1 NTU, and the particles with their size bigger than 2 μm were lower than 20 per milliliter in all the three process. The trans-membrane pressure increased by 6.59% and the water production rate of the UF membrane was 98.02% during 45 days pilot experiment in the process 1. When 0. 65mg/L chlorine was added before ultrafiltration membrane, the trans-membrane pressure was recovered effectively after hydraulic flush. And the trans-membrane pressure increased by 2.91% and the water production rate of the UF membrane was 97.63% during 10 days pilot experiment in the process 2. The trans-membrane pressure increased by 13. 52% and the water production rate of the UF membrane was 97.01% during 20 days pilot experiment in the process 3.