基于底栖动物群落特征的再生水回用河道环境质量评价

为更加全面地分析污水处理厂再生水回用于城市河道的生态安全性并评价其生境状态,该研究在宁波市某再生水回用河道的生态修复段进行了水质监测和底栖动物采样调查,通过计算Wright指数和综合水质标识指数对研究河段水质状况进行了分级评价。结果表明,再生水输入河道生态修复段后,河道常规水质指标稳定达到水环境功能区目标,Wright指数与其他自然水体相比也无明显差异。底栖动物指数与常规水质指标相结合的评价方法,可为再生水回用于景观河道的生态效应提供更为全面、合理的评价依据。

Environmental Quality Assessment of River with Reclaimed Water Based on Characteristics of Benthic Communities

In order to comprehensively analyze the ecological safety of the reuse of reclaimed water from sewage treatment plants in urban rivers and evaluate the habitat status,this study conducted the water quality monitoring and the benthic sampling surveys in the ecological restoration section of a river replenished with the reclaimed water in Ningbo.By calculating the Wright index and the comprehensive water quality identification index,the water quality status of the research section was classified and evaluated.The results showed that after the reclaimed water inputting into the ecological restoration section of the river,the conventional water quality indicators of the river reached the target of the water environment function zone steadily,and the Wright index was not significantly different from other natural water bodies.The evaluation method that combining the benthic animal index with the conventional water quality index could provide a more comprehensive and reasonable evaluation basis for the ecological effect of the reuse of the reclaimed water in the landscape rivers.