两种潜流人工湿地对二级生化出水的处理效果

Performances of Two Kinds of Subsurface Flow Constructed Wetlands for Treatment of Effluent from Secondary Biochemical Process

采用垂直潜流和水平潜流两种人工湿地处理武汉某污水厂二级生化出水,研究了不同水力负荷条件下污染物的去除效果,并进行了相关性分析。结果表明,两种湿地对COD、NH_(3)-N、TN和TP的去除效果无显著性差异。在水力负荷为0.25 m^(3)/(m^(2)·d)条件下,两种湿地对COD和TN的去除效果较好;在水力负荷为1.00 m^(3)/(m^(2)·d)条件下,对NH_(3)-N和TP的去除效果较好。相关性分析表明,两种湿地的水力负荷与TN去除率呈显著负相关关系,进水浓度在很大程度上影响着湿地的净化效果,同时各水质指标去除率之间存在一定的相关性。

Vertical and horizontal subsurface flow wetlands were applied to treat secondary biochemical effluent from a wastewater treatment plant in Wuhan.The removal effect of pollutants under different hydraulic loads was investigated,and correlation analysis was carried out.There was no significant difference in the removal efficiency of COD,NH_(3)-N,TN and TP between the two wetlands.Both wetlands had better removal performances of COD and TN when the hydraulic load was 0.25 m^(3)/(m^(2)·d),and better removal performances of NH_(3)-N and TP were obtained when the hydraulic load was 1.00 m^(3)/(m^(2)·d).The correlation analysis showed that there was a significant negative correlation between hydraulic load and TN removal efficiency in both wetlands.Pollutant concentrations in influent greatly affected the purification performance of the wetlands,and there were significant correlations among the removal efficiencies of water quality indexes.