小城镇一体化污水处理站工程设计实例

Design example of integrated sewage treatment station in a small town

云南省某小城镇污水来源主要为生活污水,具有水量较小、可生化性好、悬浮物浓度较高等特点,设计采用地埋式一体化PASG污水处理工艺,该工艺主要由两级构成,第一级为厌氧生化处理,第二级为综合生化处理。工程运行结果表明:出水CODCr、BOD5、SS、NH3-N、TN、TP的平均质量浓度分别为45、11.5、8.0、11.75、14.5、0.75 mg/L,出水水质能稳定达到GB 18918—2002《城镇污水处理厂污染物排放标准》中一级B排放标准的要求。介绍了污水处理工艺流程,给出了主要构筑物设计参数及投资运行成本。

Sewage from a small town in has characteristics of small amount, good biode tegrated Yunnan province is mainly composed of domestic sewage, which gradability, high concentration of SS, PASG technique which mainly consists of two stage treatment units（the first and so on. Underground in- stage is anaerobic biochemi cal treatment unit, and the second stage is comprehensive biochemical treatment unit） was adopted for the sewage treatment. The running results showed that, the average mass concentrations of CODcr BOD5, SS, NH3-N, TN and TP in effluent water were 45, 11.5, 8.0, 11.75, 14.5, 0.75 mg/L respectively, the effluent water quality could sta- bly meet the requirement of level B grade 1 in GB 18918--2002 Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant. The process flow of the said sewage treatment plant was introduced, the design parameters of the main structures were provided with the investment and running cost introduced at the same time.