水平流-垂直流复合人工湿地对化粪池含氮污水的净化效果

Purification Efficiency of Nitrogen by Means of Hybrid Constructed Wetlands Systems

在大量试验数据的基础上,剖析了水平流-垂直流复合人工湿地的最佳工艺参数,探讨了在不同季节、不同停留时间及不同回流比条件下此复合系统对污水氮的净化效率。结果表明,进水的氨氮浓度在24～143mg·L-1之间,氨氮的去除率为24.83%～98.41%;进水的平均总氮浓度在28～187mg·L^(-1)之间变化,系统对总氮的去除率为10.63%～62.33%,氨氮的去除效果明显好于总氮的去除效果。在同一季节内,复合系统对总氮和氨氮的去除效率随着停留时间的延长及回流比的增加都有所提高。

The optimized technological parameters in hybrid constructed wetland system from many test data were analyzed, and also the purification efficiency of nitrogen by this system under the different HRT （hydraulic retention time）, different R %（ recirculation rate） and different seasons was probed. The result showed that the concentrations of NH4-N in the inlet ranged from 24 to 143 mg·L^-1, with the averaged removal rate of NH^＋ 4-N 24.83%-98.41%. The concentrations of＇IN in the influent ranged from 28 to 187 mg·L^-1, with the averaged removal rate of TN 10.63%-62.33%. The removal rate of NH^＋ 4-N was obviously higher than that of TN. The removal efficiency of N in the wetland beds showed seasonal changes. Under the same HRT （5 d）, the removal rate of the NH^＋ 4-N and TN was better in the HV1 and HV2 systems than that of HV0. The removal efficiencies of the NH^＋ 4-N and TN in horizontal flow and vertical flow beds increased obviously with the extension of HRT under the same season. The removal rate for 3 d HRT was obviously higher than that of one day HRT, and 5 d HRT was better than that of 3 d HRT, but the removal efficiency did not vary obviously with HRT increasing. 3d HRT might be recommended in actual operation of the hybrid system for economic and technological reasons.