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

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.