The effluent from second biological wastewater treatment plants has some pollutant , especially about of N, P contaminants. This paper selected ihree surface flow constructed 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 0. 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.%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.
展开▼
