厌氧-垂直潜流型人工湿地处理生活污水

THE PILOT STUDY OF ANAEROBIC-VERTICAL SUBSURFACE CONSTRUCTED WETLAND USED IN SEWAGE TREATMENT

保持垂直潜流型人工湿地(VSCW)自身优点,将其设置为5级,利用污水的上、下行流动来复氧,并采用厌氧技术对污水进行预处理,以提高人工湿地的处理效果。结果表明,系统DO沿程下降,栽种植物后得到补充,对COD、TN、NH3-N、TP的总去除率分别达到87.6%、65.9%、76.9%、81.3%,处理后污水能达标排放;厌氧池作用明显,对COD、TN、NH3-N及TP的去除率分别达到26.5%、26.8%、25.3%、41.2%;人工湿地对COD的去除率达到83.6%,由于进水DO含量低,硝化作用不充分,TN、NH3-N的去除率仅达到53.4%、69.1%;TP的去除主要是依靠人工基质的碱性环境,去除率为68.3%;栽种植物后,COD的去除率提高明显,其余增加不多。该系统需提高人工湿地进水的DO来提高处理效果。

Keeping its own merits of the vertical subsurface constructed wetland, and setting it to 5, using upstream flow and downstream flow to supply oxygen, and raising expectations of wetland treatment effect by using anaerobic pretreatment of sewage. Test results showed that DO decline along the way in the system, and be supplemented after planting supplemented; the total removal rate of COD, TN, NH3-N, TP was respectively 87.6%, 65.9%, 76.9%, 81.3%, and the treated sewage can get up to the standard of emissions; role of anaerobic pond obviously, the removal rate of COD, TN, NH3-N and TP were 26.5%, 26.8%, 25.3% and 41.2%; in the wetland, COD removal rate was 83. 6%, but nitrification is not sufficient because the low-DO in the influent, TN and NH3-N removal rate were only 53.4% and 69.1%; TP removal is mainly dependent on alkaline environment of artificial matrix, removal rate was 68.3%; after planting, COD removal rate increase obviously, but the other increase little. DO in the influent of constructed wetland should be increased to improve treatment efficiency.