4种湿地植物对人工湿地净化生活污水的影响比较

不同类型人工湿地对生活污水的处理效果，受到许多因素的影响，其中不同植物类型的选择，可能会造成人工湿地对主要污染物COD、TN和TP的净化效果发生很大差异。研究了4种湿地植物（菖蒲、香蒲、千屈菜和水葱）在水平潜流、垂直上行流和下行流人工湿地中对人工合成的生活污水的处理效果和主要污染物（COD、TN和TP）去除率的季节变化，通过比较不同植物类型在不同湿地类型中对主要污染物的去除效果分析了可以达到最佳污水净化效果的启动条件。结果表明：香蒲在垂直下行流湿地去除有机污染物效果最好，去除率可达85.55%；水葱在垂直上行流湿地去除TN效果最好，去除率可达57.52%，香蒲在垂直上行流湿地去除TP效果最好，去除率可达84.28%。

Comparison of treatment performances of simulated urban sewage in constructed wetlands planted with four types of wetland plant

The treatment performances of simulated urban sewage in constructed wetlands are affected by many factors, and different types of wetland plants may cause vastly different purification performance. We studied the treatment performances of simulated urban sewage in horizontal subsurface constructed wetlands, upflow vertical constructed wetlands, and downflow vertical constructed wetlands with four different wetlands plants (Acorus calamus,Typha orientalis, Lythrum salicaria, and Scirpus validus), and the seasonal variation in removal efficiency of COD, TN, and TP was determined. Through a comparison of the treatment performances of the simulated urban sewage in the constructed wetlands planted with four types of wetlands plants, we analyzed the optimal start conditions that achieved the best purification performance. The vertical upflow wetlands planted with Scirpus validus achieved the highest removal efficiency of COD with a mean value of 85.55%; vertical downflow wetlands planted with Scirpus validus achieved the highest TN removal efficiency with a mean value of 57.52%; and vertical upflow constructed wetlands planted with Typha orientalis achieved the highest TP removal efficiency with a mean value of 84.28%.