序批式垂直潜流人工湿地处理农村生活污水

Cyclic Batch Subsurface Wetland for Treating Rural Sewage with Low Carbon-to-Nitrogen Ratio

通过改进人工湿地的运行方式设计研发了一种序批式垂直潜流人工湿地(CBW),并将其与传统潜流人工湿地低浸润线和高浸润线运行方式的处理效果进行了对比。CBW对TN和TP的去除率最高,分别为30.85%和52.59%;对氨氮和COD的去除率仅次于低浸润线运行方式的,分别为80.75%和70.14%。CBW处理低碳高氮农村污水的最佳水力负荷为0.1 m3/(m2·d),并且在连续两个月的运行中处理效果较稳定,出水COD和NH4+-N浓度均能达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的二级标准,为CBW在农村地区的推广应用提供了理论依据。

A novel vertical flow constructed wetland system, named cyclic batch subsurface wetland （CBW） , was developed by modifying the operation of the constructed wetland. The treatment efficiencies of CBW and conventional constructed wetlands operated under high and low water level conditions were compared. Among the three operation modes, CBW achieved the highest TN and TP removal rates, 30. 85% and 52.59% respectively. The removal rates of NH4 - N and COD by CBW were 80.75% and 70.14% respectively, only lower than those by constructed wetland operated under low water level condition. The optimal hydraulic loading of CBW for treating rural sewage with low carbon-to-ni- trogen ratio was 0.1m^3/（m^3·d）. Stable performance of the CBW system continued for two months.The effluent concentrations of NH4＋ - N and COD met the second criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002）.