Case StudyUrban of Urban River Sewage Interception and Constructed Wetland Purification,

The methods of sewage interception and constructed-wetland purification were combined and applied to enhance the water quality in the urban river under study which was contaminated by point/non-point sources from up-stream villages, towns and farmlands. In the sewage interception section, the interception zoning was applied and auxiliary facilities designed, based on the topographical condition and development sequences. In the wetland purification section, the multi-level subsurface flow wetland and cascade surface flow wetland were applied according to the topographical condition. Proper plants were chosen to ensure normal function and metabolism of the constructed wetland. The designed sewage interception capacity was 1.02×10⁴ m³/d, wetland purification capacity was 3.5×10⁴ m³/d and the surface area of the wetland is 45 hm². With the comprehensive effect of interception facilities and constructed wetland, the goal of water quality purification can be reached, meeting the standard requirement of urban river landscape. Also, it can build good water landscape in urban area and improve the eco-environment by giving full play of ecological service functions of the river and wetland.