污水处理厂提升雨季处理能力控制溢流污染案例

Case Project of WWTP for Improving the Processing Capacity in Rainy Season to Control Overflow Pollution

充分挖掘现有污水处理厂潜能,提高污水处理厂雨季处理能力,是解决城市排水系统溢流污染的重要途径。某污水处理厂采取增加生化池水深、提高生化池污泥浓度、在二沉池投加混凝剂以改善沉淀效果、次氯酸钠+紫外线联合消毒等措施,雨季平均日处理水量达到设计规模的1.54倍,最高日处理水量达到设计规模的1.87倍,出水水质稳定达标,有效削减了合流制排水系统的溢流污染。该项目实现雨季产能提升的改造投资为322.6万元,当处理水量超过设计规模后,新增污水处理量的运行成本仅为0.275元/m^(3)。

Fully exploiting the potential of existing wastewater treatment plant(WWTP)and improving its processing capacity in rainy season are important to solve the overflow pollution of urban drainage system.By taking measures such as increasing the water depth and the sludge concentration of biochemical tank,adding coagulants to the secondary sedimentation tank for improving sedimentation effect and adopting the disinfection of sodium hypochlorite combined with UV irradiation,the average daily processing capacity in rainy season of a WWTP can reach 1.54 times of the design scale,and the highest daily processing capacity can reach 1.87 times.The effluent quality can stably meet the standard,and the methods can effectively reduce the overflow pollution of the combined drainage system.The retrofit investment of this project to improve the productivity in rainy season is 3.226 million yuan.The operation cost of the extra treated wastewater is only 0.275 yuan/m3 when the treated wastewater exceeds the design scale.