城镇污水处理厂进水中地下水、河水及雨水混入比例研究

进水污染物浓度低及比例失调是目前许多城镇污水处理厂面临的问题，然而鲜有关于渗漏来源及定量分析的相关文献报道。为定量分析河水、地下水、雨水、管道中污染物降解等因素对污水浓度降低的影响，通过水量平衡三角法，并结合典型位点的24 h采样测试分析及S-P降解模型，对目标城镇污水处理厂进水组成进行分析。历史水量数据结合降雨情况分析表明，该污水处理厂进水中实际原生污水量仅为60.0%左右，其余40.0%左右为地下水及河水渗入量或雨水混入量。在连续晴天无降雨的情况下，小区自建管网和市政排水管网是主要的渗漏源，其对于进水有机物浓度降低的贡献分别为20.2%和26.4%。此外，在25 mm降雨量情况下，小区自建管网是主要的渗漏源，对于进水浓度降低的贡献达到39.5%。因此在污水处理提质增效工作中，小区自建管网的完善程度应引起关注。

A QUANTITIVE STUDY ON PROPORTION OF GROUNDWATER,RIVER WATER AND RAINWATER IN INFLUENT OF URBAN WASTEWATER TREATMENT PLANTS

At present, many urban wastewater treatment plants are facing the problems of low concentration and imbalance of influent pollutants. However, there are few reports on the source and quantitative analysis of leakage. In order to quantitatively analyze the influence of river water (groundwater), rainwater and pollutant degradation in pipeline on the reduction of wastewater pollutants' concentration, wastewater source of the target wastewater treatment plant was analyzed by the method of water balance trigonometry, conbined with analysis of wastewater in typical sites and the S-P degradation model. The results showed that historical water volume data combined with rainfall analysis indicated that the actual amount of primary sewage in the influent of the WWTP was only about 60.0%, and the remaining 40.0% was groundwater and river water infiltration or rainwater infiltration. The pipe network of residential quarters and municipal drainage pipe network were the main leakage sources in the sunny days, and their contribution to the reduction of inflow concentration were 20.2% and 26.4%, respectively. In addition, the pipe network of residential quarters was the main leakage source, which contributed 39.5% to the decrease of the influent concentration under 25 mm rainfall events. Therefore, attention should be paid to the completeness of residential quarters' pipe network in the process of improving the quality and efficiency of wastewater treatment.