污水厂再生水回用于城市内河的生态修复效果及安全性评价

为降低污水厂再生水回用于城市景观水体时可能出现的生态环境风险，以宁波市某污水厂再生水回用于河道的生态修复段为研究对象，采用生态集成技术对再生水进行净化及自然修复，研究其对再生水常规水质指标、水体综合生物毒性及河道底栖动物群落特征的影响。结果表明:河道生态修复措施对稳定再生水水质的效果明显，主要水质指标保持稳定并达到功能区水质要求，再生水水质毒性降低，河道底栖动物物种丰度及生物密度也均明显增加，有效降低了再生水补水时可能带来的生态风险，对保障城市内河活水流动、生态安全具有重要作用。

ECOLOGICAL RESTORATION EFFECT AND SAFETY EVALUATION OF RECLAIMED WATER FROM SEWAGE TREATMENT PLANT FOR URBAN RIVERS

In order to reduce the risk of ecological environment when the reclaimed water from a sewage plant is reused in the urban landscape water body, this paper took the ecological restoration section of a sewage plant in Ningbo as the research object, used the ecological integration technology to purify and repair the reclaimed water, and studied its conventional water quality index, comprehensive biological toxicity of water body and characteristics of river benthos community impact. The results showed that the ecological restoration measures had obvious effect on the stability of reclaimed water quality; the main water quality indicators remained stable and met the water quality requirements of the functional area; the toxicity of reclaimed water quality was reduced; the species richness and biological density of benthos in the river were also increased significantly, which effectively reduced the ecological risks from the replenishment of reclaimed water, had a significant impact on the flow and ecological safety of urban river water.