城市河流截污与人工湿地净化实例

针对受上游村庄、城镇、农田等点源、面源污染的城市河道，采用截污与人工湿地净化协同的处理方法改善水质。其中截污环节根据地形与开发时序，合理设置截污分区，设计了配套所需的截污设施；湿地净化环节合理利用自然地形采用多级潜流人工湿地与阶梯多级表面流湿地复合的湿地水净化系统，并选取合适的湿地植物，保障人工湿地正常代谢。设计截污能力为1.02×10⁴ m³/d，人工湿地处理能力为3.5×10⁴ m³/d，人工湿地面积45 ha。经过截污与人工湿地净化协同作用，可基本实现水质净化目标，使其达到河道的景观水质标准要求，不仅有效保障处理水质更可营造城市水景，通过充分发挥河流与湿地生态服务功能，可改善研究区所在地生态环境。

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.