四川望佳人工湿地系统生活污水净化效果

Treatment efficiency of domestic wastewater at Sichuan Wangjia constructed wetland system

取样监测分析了望佳人工湿地系统各组成单元对COD、TN、NH3-N、TP和SS的去除效果。在水力负荷为0.18 m3/m·d、温度为8~19℃、p H为6~8的条件下,分析结果表明,各单元COD、TN、NH3-N、TP和SS的系统去除率满足:人工快渗池>厌氧调节池>1号表流湿地>潜流湿地>氧化塘>2号表流湿地>1号水平潜流湿地>2号水平潜流湿地,其中人工快渗池单元的系统去除率平均值分别为21.21%、22.74%、22.49%、25.58%和30.85%。监测期间COD、TN、NH3-N、TP和SS的总去除率平均值分别为89.41%、90.27%、89.89%、89.89%和92.28%,系统出水达《城镇污水处理厂污染物排放标准》GB18918-2002一级标准的B标准。监测表明,该湿地设计偏于保守,还可以优化设计单元以减少建设和运行成本。

The removal efficiencies of COD,TN,NH3-N,TP and SS for each unit of Wangjia constructed wetland system were monitored and analyzed over two months.Under the conditions that the hydraulic load was0.18 m3/(m·d),temperature was 8 ~ 19℃,p H was 6 ~ 8,the results showed that the average removal efficiencies of COD,TN,NH3-N,TP and SS satisfied with artificial fast infiltration > ABR > No.1 surface flow wetland > subsurface flow wetland > oxidation pond > No.2 surface flow wetland > No.1 horizontal subsurface flow wetland > No.2 horizontal subsurface flow wetland,and the average removal efficiencies of COD,TN,NH3-N,TP and SS for artificial fast infiltration were 21.21%,22.74%,22.49%,25.58%,30.85%,respectively.During the period of monitoring,the average removal efficiencies of COD,TN,NH3-N,TP and SS for wangjia constructed wetland system were 89.41%,90.27%,89.89%,89.89% and 92.28%,respectively.The effluent treated from the system can meet the level 1 standard of the national urban sewage discharge standards.Based on the analysis results,the wetland design was conservative;it can be optimized to reduce the construction and operation costs.