平原河网地区排水管网提质增效案例分析与探讨

Case analysis of improving quality and efficiency of sewage pipe network in plain river network area

平原河网密集区域大量外水入渗导致污水处理厂进水浓度低、收水量超负荷问题时常发生,排水系统入渗问题严重且亟待解决.以某污水服务片区为例,前期通过水质平衡定性水质异常原因,以主管表征点水质作为溯源依据,对关键节点水质/水量分析,准确定位重点问题片区,排查共发现影响水质浓度问题120处,对较严重问题点修复后,管网液位整体下降,污水处理厂进水COD浓度稳定提升至250 mg/L水平,对比污水处理厂处理量"挤外水"率达到40.6%.

The infiltration of a large amount of external water in the dense plains of the river network has led to the long-term occurrence of low influent concentration and overloaded water collection in the sewage treatment plant.The infiltration problem of the drainage system is serious and needs to be solved urgently.Taking a sewage service area as an example,in the early stage,the cause of the abnormal water quality was qualitatively determined by the water quality balance,and the water quality of the main characterization point was used as the source of traceability.The water quality/water quantity of the key nodes was analyzed»and the key problem areas were accurately located.A total of 120 problems affecting the water quality concentration were found in the investigation.After the more serious problems were repaired,The liquid level of the pipe network dropped as a whole,and the COD concentration of the sewage treatment plant influent was steadily increa'sed to the level of 250 mg/L.Compared with the sewage plant treatment volume,the“squeezing out water”rate reached 40.6%.