三峡库区小城镇污水处理CASS工艺设计实例

A Case Study for the Design of CASS Process Treating Wastewater in the Three Gorges Reservoir Area of China

为减少富营养物质的排放，保护三峡库区水环境。针对三峡库区上游某市的污水特点，经技术经济比较后提了用CASS工艺＋混凝＋过滤＋消毒的处理方案，实际运行效果表明：当设计进水水质为BOD5为150mg／L，CODcr，为300mg／L，SS为250mg／L，TN为45mg／L，NH3N为35mg／L，TP为4．0mg／L时，出水能够达国家出水水质一级A标准。正常生产年年处理总成本为981．55万元，单方污水处理总成本为1．34元／耐。

For reducing the discharge of rich nutrients, and protecting the three gorges reservoir area,CASS process and advanced treatment were designed to treat waste water discharged by a city located in the upstream of three gorges reservoir. The opera- tion effect shows that the effluent can meet the first, class requirement of ＂ Discharge standard of pollutants for municipal wastewater＂ （GB 18918 2002） when BODcr is 150 mg/L,CODcr is 300 mg/L,SS is 250 mg/L,TN is 45 mg/L, NH3-N is 35 mg/L, and TP is 4.0 mg/L in the influent. The total cost of treating wastewater was 9. 8155 million yuan per year and the water cost is 1.34 yuan/m3.