厌氧—接触氧化渠—垂直潜流型人工湿地处理农村生活污水研究

Study on anaerobic-contact oxidation ditch-vertical subsurface constructed wetland to treat rural domestic sewage

选择厌氧—接触氧化渠—垂直潜流型人工湿地工艺处理农村生活污水,分析比较了各工艺段DO水平,接触氧化渠充氧效果明显。通过对COD、NH3—N和TP浓度及去除率的研究发现,厌氧池去除率较稳定,对各污染物去除率最高可达72%、49.54%和66.36%,接触氧化渠和人工湿地对各污染物也有较高去除率,但并不稳定。系统运行稳定后,出水水质整体可达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)二级标准,部分时段可达一级B标准。

The anaerobic-contact oxidation ditch-subsurface constructed wetland was selected for the treatment of rural domestic sewage. By analyzing and comparing DO concentration of each process, the results showed oxygenation in contact oxidation ditch was remarkable. Through the study on concentration and removal rate of COD, NH3--N, and TP, the anaerobic tank removal performance was stable and could reach up to 72%, 49. 54~//00, and 66. 36~ respectively. The re- moval rates of contact oxidation ditch and constructed wetland were high but unstable. When the system operation reached steady, the final effluent reached the second grade standards of Discharge standard of pollutants for municipal wastewater treatment plant （GB 18918-2002） generally, and sometimes could even reach the first-grade B standards.