Purification Efficiency of Agriculture Wastewater by Subsurface Constructed Wetland

The purification experiment dealing with agriculture wastewater by subsurface constructed wetland was carried out. The nitrogen and phosphorus purification efficiency by the wetland in different hydraulic retention time (HRT), for different water depth and different concentration of inflowcoere mornitored. The experiment result showed that there was an optimal HRT in the run, the deeper depth of water was beneficial for wastewater's purification, and the concentrations have little influent on it. The wetland's removal rate of total phosphorus was 63%~85%, but the rate of nitrogen was lower. The paper analyzes the results from the mechanism of purification.