Research On Water Purification Of Artificial Wetland System In The Lake Of Beijing Garden Expo Park

Constructed wetland is a new-style and effective method to deal with the contaminated water in the park, which can not only remove pollutants in the water, but also enjoy the ornamental performance and economic benefits. Artificial wetland system in the lake of Beijing Garden Expo Park, as currently the Asia’s largest subsurface constructed wetland, is our country’s important research object, and it is also an important project that plays the role of purifying the recycled water of Fengtai section of Yongding River. This study takes the artificial wetland system in the lake of Beijing Garden Expo Park as the object of study, according to the different seasons of the artificial wetland system in the lake of Beijing Garden Expo Park, choose suitable for detection of time in winter and summer to deal with the water quality detection. In the four sections of subsurface flow constructed wetland, three wetland unit inlet valve shaft and its corresponding water outlet valve well are selected as monitoring points in each district, and take the mean value as the monitoring data.Taking data analysis and comparison after the treatment of monitoring indicators, the results show that, the artificial wetland system in the lake of Beijing Garden Expo Park can play a certain purifying effect on the indexes such as NH4- N, TP, COD, SS, especially the removal rate of NH4-N is the highest up to 98.63%, and the average total removal rate reaches 73.1%.The removal efficiency of the effluent in the lake of Beijing Garden Expo Park can basically meet the design criteria. And there are gaps in the purification effect of each district, and the purification effect is different in winter and summer. But it is still a necessary to establish and improve the management mechanism for the artificial wetland system in the lake of Beijing Garden Expo Park, to strengthen the management and maintenance of aquatic plants, and to increase efforts to preach the visitors to reduce the impact of visitors on the artificial wetland system in the lake of Beijing Garden Expo park.