再生水补给城市河湖水生态系统构建及管护技术体系研究应用——以圆明园为例

The ecosystem construction and management and protection technology applied for reclaimed water replenishing urban river and lake water-taking Old Summer Palace as an example

提出了“再生水水源补给城市河湖水生态系统构建及管护技术体系”,并在圆明园开展了推广应用,设计建设了近70 hm^(2)再生水水源补给城市河湖水生态系统构建及管护示范区.结果表明,该技术可有效改善水体景观、水质及水生态状况:浊度明显降低,示范区浊度大多小于3 NTU(饮用水浊度国家标准1 NTU),感官效果明显优于修复前;总磷平均去除率超过70%,总氮平均去除率超过80%,CODcr浓度由Ⅴ类降至Ⅲ类,水质综合指标可以达到湖库Ⅲ类标准;水生态健康状况进一步提升,可以达到清水水源补给水体水生态健康状况水平.该技术具有节约水资源、水质净化和生态虚浮效果好的优点,适用于再生水补给城市河湖的生态治理与恢复.

This research puts forward“The Ecosystem Construction and Management and Protection Technology System for Reclaimed Water Replenishing Urban River and Lake Water”,which was promoted and applied in Old Summer Palace.Nearly 70 hectares of reclaimed water sources for urban rivers and lakes ecosystem construction and management and protection demonstration areas were designed and constructed.The results show that the technology can effectively improve the water landscape,water quality and water ecology.The turbidity is significantly reduced;the turbidity in the demonstration area is mostly less than 3 NTU(the national standard for drinking water turbidity 1NTU);and the sensory effect is significantly better than before restoration.the average removal rate of total phosphorus exceeds 70%,and the average removal rate of total nitrogen exceeds 80%.The concentration of CODcr is reduced from Class V to Class III,and the comprehensive water quality index can reach the lake and reservoir Class III standard.The water ecological health status is further improved,and it can reach the water supply of clean water source.This technology has the advantages of saving water resources,water quality purification and ecological floating effect,and is suitable for ecological treatment and restoration of urban rivers and lakes supplied by reclaimed water.