新型人工湿地用于校园生活污水强化氨氮、磷及有机物的去除

Enhancement of ammonia nitrogen phosphorus and organic matter removal in novel constructed wetlands to treat domestic wastewater for campus

该试验选用垂直地下流人工湿地(vertical subsurface flow constructed wetlands, VSSF-CWs)处理校园生活污水,第一、三级人工湿地水力负荷为0.822m^3/(m^2·d),第二、四级为0.038m^3/(m^2·d)。以潮汐流方式运行(运行周期为8h),提高溶解氧供给,强化NH4^+-N 及COD 的去除;并选用建筑固体废弃物为填料强化磷的去处。试验结果表明:COD 浓度由118.60±37.91mg/L 降为43.50±16.56mg/L,平均去除率为87.03%;NH4^+-N 主要通过硝化作用转化为硝氮,浓度由48.74±15.96mg/L 降为1.57±1.48mg/L,平均去除率为96.69%。建筑固体废弃物表现出良好的吸附性能,PO4^3--P 浓度由2.94±0.92mg/L 降为0.02±0.01mg/L,平均去除率为99.36%。

Vertical underground flow constructed wetland was selected to treat Campus Domestic Sewage in this experiment. The hydraulic loading of the first and third stages was 0.822 m3/(m2·d), while, the hydraulic loading of the second and fourth stages was 0.038 m3/(m2·d). To enhance ammonia nitrogen and COD removal, the tide-flow operation was adopted(the cycle of circulation was 8 h) to increase dissolved oxygen supply. At the same time, the removal of phosphorus was strengthened by using building solid waste as filler. The results showed that a perfect efficiency was achieved. The concentration of COD decreased from 118.60±37.91 mg/L to43.50±16.56 mg/L, and the removal efciency was 87.03%. The concentration of NH4+-N dropped from 48.74±15.96 mg/L to 1.57±1.48 mg/L, which mainly transformed into nitrate by nitrification, and the removal efficiency was 96.69%. Construction solid waste showed perfect P sorption capacity. The concentration of PO43--P dropped from 2.94±0.92 mg/L to 0.02±0.01 mg/L, and the removal efficiencies of PO43--P was 99.36%.