日本横滨市水厂滤池现状分析

Analysis on Current State of Filters in Water Purification Plants in Yokohama,Japan

横滨市水道局下属的4座水厂采取测量砾石起伏程度、滤池翻修时铺设多孔双层滤砖和不锈钢丝网等措施来保证滤池的正常有效运行;针对藻类(如尖针杆藻)暴发问题,采取在原水输送管道中加氯、在水厂投加粉末活性炭、提高混凝剂投量等措施,使尖针杆藻在混凝沉淀过程中的去除率达到95%,大大降低了滤池的运行负担并避免了滤料堵塞等问题。

The methods of measuring unevenness of gravels, laying multiple-orifices filter blocks and stainless nets during the filter reconstruction were used in four water purification plants in Yokohama to assure the normal and effective operation of the filters. The treatment methods such as chlorination in raw water transmission pipeline, adding powdered activated carbon in the water purification plants, increasing dosage of coagulant were adopted to deal with high concentration of Synedra acus proliferation in raw water. Finally 95% of Synedra acus was removed after coagulation and sedimentation. These methods consumedly reduced the running burden on the filters and avoided serious filter clogging problem.