舒兰市污水处理厂一期工程的二级处理工艺采用循环式活性污泥法(CAST),介绍了污水处理工艺流程、主要构筑物设计参数,并针对寒冷地区CAST工艺在设计及运行中易出现的问题提出改进措施.试运行期间处理出水水质达到了设计要求,该工艺适用于东北寒冷地区中小型污水处理厂.%Cyclic activated sludge technology (CAST) was used as the secondary treatment process of the first phase project of the sewage treatment plant in Shulan city. The process flow and the design parameters of main structures of the said wastewater treatment plant were introduced; meanwhile, in view of the common problems existing in the design and the operation of CAST in cold region, some modification measures were put forward. During the trial operation, the effluent water quality met the design requirements. The process is suitable for small and medium sized sewage treatment plants in cold region of northeastern China.
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