高原地区CASS工艺处理城镇污水的生产性调试

高原地区的污水处理工艺调试具有低温低压低氧的不利条件。香格里拉城市污水处理厂二期扩建采用CASS工艺。针对当地气温、气压、进水浓度低的特点，通过调整曝气方式、合理控制溶解氧、保温培养活性污泥等方法，探讨了设计参数与运行工况不匹配的情况下达到系统稳定运行的技术途径。当进水水质为：CODCr：50．0～164．0mg／L，SS：30．0～123．0mg／L，TN：7．0～82．6mg／L，NH3-N：1．9～39．2mg／L，TP：0．6～3．2mg／L，出水水质为：CODCr：10．O～49．0mg／L，SS：5．0～22．0mg／L，TN：3．4～22．7mg／L，NH3-N：0．9～11．1mg／L，TP：0．1～1．8mg／L时，各项水质指标均达到《城镇污水处理厂污染物排放标准》（GB18918—2002）一级B标准。根据调试研究的结果提出了今后运行的建议。

Productive Commissioning of CASS Process Treating Sewage in Plateau Region

Productive commissioning of treating sewage in plateau region has the features of low temperature, low atmosphere pressure and low oxygen concentration. The CASS process was applied in the expansion of wastewater treatment plant in Shangri-La. Aiming at the low air temperature and low atmosphere pressure and the low concentration of influent, several approaches, such as adjusting the aeration mode compatibly, controlling the contents of dissolved oxygen and cultivating active sludge with warm maintenance, were studies for system stable operation under the condition of mismatch between design parameters and operation mode. With the field test, when the water quality of influent was： CODCr： 50.0-164.0 mg/L, SS：30.0-123.0 mg/L, TN：7.0-82.6 mg/L, NH3-N：1. 9-39.2 mg/L, TP：0.6-3.2 mg/L, the quality of effluent was： CODCr：10.0-49.0 mg/L, SS： 5.0-22.0 mg/L,TN：3.4-22.7 mg/L, NH3-N：0.9-11.1 mg/L, TP：0.1-1.8 mg/L, in which the standard of the level B in class I were achieved according to Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB18918-2002）.