人工湿地深度处理生活污水的机理研究

Mechanism study about advanced treatment of domestic sewage by constructed wetlands

生活污水经过二级处理后的废水中仍含有相当数量污染物,尤其是N、P含量较高.采用表面流人工湿地处理系统,选取了3种常见的水生植物:香蒲、浮萍和芦苇作为主体植物进行废水的深度处理研究.试验结果表明,在水力负荷为0.04 m3/m2.d时,三类人工湿地系统均有较好的效果,对BOD5的平均去除率分别为83.9%、82.6%和77.1%;对NH3—N的去除率分别为80.4%、81.5%、74.2%,对TN的去除率分别为37.0%、50.6%和36.2%;对TP的去除率分别为71.9%、72.2%和69.7%;采用一级反应动力学方程对试验数据进行拟合,得到了该试验条件下污染物去除的反应速率常数.

The effluent from second biological wastewater treatment plants has some pollu- tant, especially about of N, P contaminants. This paper selected three surface flow construc- ted wetland systems with different plants： cattail, duckweed and reed to refine the wastewater said above. It was found out that three constructed wetlands had good purification effect. When hydraulicloads of these system were O. 04 m3/m2 . d, the removal rate of BOD5 was 83.9% ,82.6% and 77.1% , respectively. While the NH3-N had the removal rate of 80. 4% ,81.5% and 74.2% ,the TN had the removal rate of 37.0% ,50.6% and 36.2% ,the TP had 71.9% ,72.2% and 69.7%, respectively. The reaction rates of pollutant removal under the experimental conditions were computed by fitting the experimental data using first -order kinetics equation.