污水管网中雨水混接来源的高效诊断方法

Costeffective Locating Inappropriate Rainfall Inflow into Urban Sewer Network

摘要:

污水管网中雨水混接不仅会导致雨天污水厂运行受到影响，而且产生管网污水冒溢.针对在大范围污水管网中同步安装管道流量计识别雨水混接点位难以操作的问题，提出了基于管网节点水质特征因子监测的低成本雨水混接来源诊断技术方法.具体以总氮和电导率分别作为指示生活污水和雨水的特征指标，并结合污染源地理信息系统、管网节点化学质量平衡和入流水质特征因子浓度数据库，有效解析污水管网中各管段的旱天入流水量和雨天雨水混接量.对安徽省巢湖市城区污水管网雨水混接来源的解析证明了该方法的可靠性，提出了雨水入流来源解析的基本原则.

Abstract:

Inappropriate rainfall connection to the sewer network would not only degrade the treatment efficiency of wastewater treatment plant, but also lead to sewer’s wastewater overflow on wetweather days. The identification of sewer’s rainfall inflow by simultaneous flow measurements in manholes being hard to implement, a costeffective approach based on marker species monitoring of the sewer network was presented. Specifically, total nitrogen and electrical conductivity being employed as the markers of sewage and rainfall respectively, in combination with the geographic information system of pollution sources, chemical mass balance at the sewer network nodes and data library of marker inflow concentration, the dryweather flow as well as the rainfall inflow received by each sewer segment could be quantified effectively. A case study to identify inappropriate rainfall inflow into the sewer network of Chaohu City, Anhui Province, of China, showed the reliability of the proposed approach, hence the basic principles for the method application was recommended.