生物接触氧化/垂直流人工湿地处理城市生活污水

Treatment of Municipal Sewage with Combined Process of Biological Contact Oxidation and Integrated Vertical Flow Constructed Wetlands

采用生物接触氧化和复合垂直流人工湿地的组合工艺处理城市生活污水,考察了对主要污染指标的去除效果。结果表明:与不曝气和连续曝气相比,在间歇曝气条件下,组合工艺对COD和氮的去除率较高。在进水负荷为0.8 m3/(m2.d)、水力停留时间为1 d、曝气量为4.038m3/(m2.d)、曝气/停曝周期为20 min/60 min的条件下,组合工艺对COD、NH4+-N、TN的去除率分别为80.37%、98.32%、80.22%,出水COD、NH4+-N、TN浓度均达到了《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。

The combined process of biological contact oxidation and integrated vertical flow constructed wetlands was applied to treat the municipal sewage, and the removal effects of main pollutants were investigated. The results show that compared with the no aeration and the continuous aeration, the removal rates of COD and nitrogen by intermittent aeration are higher. Under the conditions of influent load of 0.8 m3/（m2 ·d） , HRT of 1 d, aeration rate of 4. 038 m3/（m2·d） and aeration/no aeration of 20 min/60 min, the average removal rates of COD, NH4 - N and TN are 80.37% , 98.32% and 80.22% respectively. The effluent COD, NH4 - N and TN meet the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002 ）.