三级人工湿地渗滤床处理生活污水中试研究

Three-stage Constructed Wetland System for Domestic Sewage Treatment

采用三级人工湿地渗滤床系统处理某城镇的校区生活污水,当进水COD平均为300mg/L、温度为20～35℃、COD负荷为55.4g/(m2.d)时,出水COD可降至41mg/L,达到了GB18918—2002的一级B标准;该系统的COD负荷较传统人工湿地提高了5.17g/(m2.d);同时,对TN和TP的去除率分别为43.4%和46.5%,去除负荷分别为4.6、0.39g/(m2.d)。

The three-stage constructed wetland system was used to treat sewage from a campus in pilot scale experiment. When the average influent COD is 300 mg/L, the temperature is 20 ℃ to 35 ℃, and the COD load is 55.4 g/（m^2 · d） , the effluent COD can be degraded to 41 mg/L, which satisfies the first level B criteria specified in the Discharge Standard of Pollutants for Municipal 1Vastewater Treatment Plant （GB 18918 -2002）. The COD load is about 5.17 g/（ m^2 · d） higher than that of conventional constructed wetlands. The removal rates of TN and TP are 43.4% and 46.5% , and their removal loads are 4.6 g/（m^2 · d）） and 0.39 g/（m2 · d）, respectively.