垂直流-表面流复合人工湿地系统对污水的净化效果研究

Study on Purification Efficiency of Wastewater by Composite Artificial Wetland System of Vertical Flow Surface Flow

[目的]研究垂直流一表面流复合人工湿地系统对污水的净化效果。[方法]采用表面流湿地与垂直流湿地组合成的复合人工湿地系统对污水进行处理，研究该系统在水力停留时间分别为48、24、12、6h时对污水的净化效果。[结果]垂直流湿地对COD、BOD的去除率达52％以上，复合湿地系统对有机物的去除率随水力停留时间的增加而有所增加，对COD、BOD的去除率分别为62％～70％、60％～82％。表面流湿地在N的去除上起比较重要的作用，复合湿地系统对TN、NH4^＋-N的去除率分别为23．5％-46．4％、42．85％～80．38％。垂直流湿地对，IP的去除效果明显好于表面流湿地，在不同配水条件下，复合湿地系统对TP的去除率达47．84～73．56％。[结论]垂直流一表面流复合人工湿地系统对污水的净化效果较好。

[ Objective] The aim was to research on purification efficiency of wastewater by composite artificial wetland system of vertical flow surface flow. [Method] The composite artificial wetland system that was combined by surface flow and vertical flow wetland was adopted to treat with wastewater, and the purification efficiency on wastewater by this system was studied when the hydraulic retention time （HRT） was 48, 24, 12, and 6 h resp. [ Result] The removal rotes of vertical flow wetland on COD, BOD were over 52%. The removal rate of ~ite wetland system was raised somewhat along with the increase of hydraulic retention time and its removal rates on COD, BOD were 62% -70% and 60% -82% resp. The surface flow wetland had an important effect on N removal and the removal rates of con＇rposite wetland system on TIN and NH4^＋ - N were 23.5% -46.4% and 42.85% - 80.38% resp. The removal effect of vertical flow wetland on TP was much better than the one of surface flow wetland, and the removal rate of composite wetland system on TP was up to 47.84% - 73.56% under different conditions of water distribution. [ Conclusion] The composite artificial wetland system of surface flow vertical flow had better purification effect on wastowater.