基于污水管网液位及水质监测的运行分析

Operation analysis based on sewage pipe network level and water quality monitoring

针对近些年城市生活污水处理厂进水水质(COD)浓度低的问题,本文选取福州市连坂片区内适宜、重要监测点(液位监测点18个,水质监测点63个),构建精细化分层级监测网络,对片区内污水管网的液位及水质进行统计分析,确定低水质片区并初步分析原因,探讨连坂片区污水管网运行状况。分析结果表明:南二环沿线等路段市政污水管网的水质波动性较大,且水质较低;连坂片区水系接入点接入的污水水质较低且水量大;南二环沿线管网的液位变化与降雨呈现明显的相关性,沿线管网可能存在雨污混接情况。下一步工作需对部分路段进一步取样分析,并加密沿线监测点布设,以更加准确判断水质情况。

In view of the low inlet water concentration quality(COD)in urban domestic sewage treatment plants in recent years,this paper selects the appropriate and important monitoring points(18 liquid level monitoring points,63 water quality monitoring points)in Lianban District,Fuzhou City,builds a refined hierarchical monitoring network,carries out a statistical analysis on the liquid level and water quality of the sewage pipe network in the district,determines the districts with low water quality and analyzes the causes initially to discuss the operation status of sewage pipe network in Lianban District.The analysis result shows that:The water quality of the municipal sewage network along the South Second Ring Road fluctuates greater,and the water quality is relatively low;The quality of sewage water access points in Lianban area is low and the amount of water is large;The variation of liquid level in pipe network along the South Second Ring Road is obviously correlated with rainfall,and there may be mixed connection of rain and sewage water in pipe network along the South Second Ring Road;The next step of work needs to further sample and analyze some sections of the road,and set up more monitoring points along the route to determine the water quality more accurately.