基于水质水量沿程分析的污水管网问题识别

Identification of Problems in Sewer Network Based on Analysis of Water Quality and Quantity along Way

摘要:

以安徽省某镇污水系统为例，对污水管网关键节点进行水质水量监测，根据监测数据对管网水质和水量进行沿程变化分析，识别污水管网存在的问题，为该镇污水处理提质增效提供支撑。分析结果表明，该镇市政污水管网COD浓度每千米沿程降低（85.7±17.5） mg/L，而流量每千米沿程增长（70.0±46.2） m³/h（P=0.001）。部分节点雨天COD浓度较旱天下降超40%，节假日污水处理厂进水浓度显著低于工作日。综合水质与水量沿程变化分析及CCTV检测资料，确定了该镇污水管网结构性缺陷及雨污混接问题管段范围。

Abstract:

Taking the sewage system of a town in Anhui Province as an example, the water quality and quantity at the key nodes of the sewer network are monitored. Based on the monitoring data, the along-way change in the water quality and quantity of sewer network is analyzed to identify the problems existing in the sewer network, which provides the support for improving quality and efficiency of the sewage treatment of this town. The analysis results show that the COD concentration in the municipal sewer network of this town decreases by （85.7±17.5） mg/L per kilometer along the way, while the flow increases by (70.0±46.2) m³/h per kilometer (P=0.001). The COD concentrations in some nodes decrease by more than 40% on rainy days compared with that on dry days. The concentration of the influent into the wastewater treatment plant (WWTP) on holidays is significantly lower than that on working days. By synthesizing the along-way change analysis on the water quality and quantity as well as CCTV inspection data, the scope of the pipe sections with structural defects in the sewer network and the problem of mixed connection of rainwater and sewage in this town are determined.