珠海浅丘地区城中村合流制排水的水量和水质特征

Wastewater Quantity and Quality Characteristics of Combined Sewer System in Urban Village in Shallow Hilly Region of Zhuhai City

合流制排水系统溢流污染是黑臭水体形成的重要原因之一。为优化浅丘地区城中村的黑臭水体治理,对珠海市界涌村合流制排水系统进行了水量和水质监测。结果表明,该城中村的合流制排水系统具有典型的南方小城镇排水规律特征,有明显的双峰值,排水不均匀性较大,流量时变化系数为1.73,日变化系数为1.27。城中村合流制排水系统的外水侵入情况较严重,外水侵入量占比为40%~50%;对排水系统进行分流制改造可明显提高排水系统中的污染物浓度,但管道存在的问题仍不容忽视。城中村生活污水的COD浓度水平尚属典型的城市污水浓度范围,但TN、NH3-N和TP浓度较高,比一般城市污水高50%~100%。

The pollution of combined sewer overflows has become one of the important reasons for the formation of black-odor water.In order to optimize the remediation effect of black-odor water,wastewater quantity and quality of combined sewer system in Jiechong Village, Zhuhai City were monitored.The combined sewer system of this typical urban village had the same drainage system pattern of typical small towns in the south of China,which had obvious double peaks and inhomogeneity with the flow hourly variation coefficient of 1.73 and the flow daily variation coefficient of 1.27.There were serious leakage problems in the combined sewer system,in which the proportion of water seepage was about 40%-50%.The concentration of pollutants in the drainage system could be significantly increased by transforming the combined sewer system into separate sewer system.However,problems of the pipeline could still not be ignored.The concentration of COD in urban sewage was still within the typical concentration range of urban sewage,but the concentrations of TN,NH3-N and TP were relatively high,which was about 50%-100% higher than that of general urban sewage.