莲花湖人工湿地对污水的净化效果研究

Study on Purification Effect of Sewage by Constructed Wetland in Lianhua Lake

以莲花湖复合式人工湿地为研究对象,分析了对COD、TN、TP的去除效果,以期为中国东北地区构建人工湿地提供技术支持。研究结果表明,垂直潜流湿地对COD的去除效果比水平潜流湿地强;同表流湿地相比,潜流湿地对COD的去除效果相对较好。莲花湖人工湿地对TN的去除效果比较显著;在各湿地单元中,下行流湿地对TN的去除率最低。垂直潜流湿地对TP的去除效果明显比水平潜流湿地强,表流湿地对TP的去除效果最好;水平潜流湿地容易发生基质堵塞,影响了其净化功能。人工湿地系统对COD和TP的去除效果在8月和9月最为显著,7月、8月及9月下旬对TN的去除效果最好。对TP的去除率从10月下旬开始出现负值,丧失了除磷功能。

Taking compound constructed wetland in Lianhua lake as research object, the purification efficiency of COD, TN and TP by the constructed wetland was analyzed to provide technical support for establishment of constructed wetlands in northeast China. The results show that the purification efficiency of COD in vertical subsurface flow wetland is better than that in horizontal subsurface flow wetland. Compared with the surface flow wetland, subsurface flow wetland has the better removal efficiency of COD. The constructed wetland in Lianhua lake has significant purification efficiency of TN. In various wetland units, down-flow wetland has the lowest removal rate of TN. the purification efficiency of TP in vertical subsurface flow wetland is better than that in horizontal subsurface flow wetland. The surface flow wetland shows the best performance in removal of TP. The substrate in horizontal subsurface flow wetland is easy to be blocked, and its purification function is affected. The constructed wetland shows the best performance in removal of COD and TP in August and September and in removal of TN in July, August and late September. The removal rate of TP in late October becomes negative.