污水再生用于湖泊的补水模式及其环境效应

Water supplement pattern and its environmental effects by wastewater reuse for lake

提出一种污水分散处理与景观水体修复相结合的城市景观湖泊补水模式,探讨了该模式的经济效益和环境效应.结果表明,采用该补水模式,污水回用成本为常规补水工艺的12%-35%.在高温雨季,分散处理系统出水能够直接满足景观湖泊补水要求;而在低温旱季,沿景观湖泊水流方向,湖泊水质迅速从Ⅴ类变为Ⅲ类,污染物集中在分散处理系统以及景观湖泊前端（HRT〈2d）去除,大部分湖区可作为全身接触性娱乐类景观功能区.

Through optimizing and combining the decentralized wastewater treatment process and the landscape impoundment restoration technology, a new water supplement pattern for urban landscape lake was presented. The economic advantages and environmental effects of this pattern were investigated. This water supplement pattern possessed higher economic advantages with the reuse cost only being 12%-35% of the traditional technologies. In rainy season, the effluent of the decentralized treatment process met the requirements of GB/T18921-2002, and could be reused directly for landscape impoundments. While in dry season, not only decentralized wastewater treatment process but also the foreside of landscape lake （HRT〈2d） played relatively important roles for pollutants removal; with water flowing from the foreside to the backside of the landscape lake, water quality gradually improved from Grade Ⅴ to Grade Ⅲ and most zones could be contacted directly by full-body.