雨天合流制排水系统水质水量调查与分析

发布时间：2018-03-29 19:27

本文选题：合流制　切入点：溢流污染　出处：《武汉理工大学》2013年硕士论文

【摘要】：目前我国许多城镇的老城区沿用截流式合流制,该类排水系统雨天溢流污水会对受纳水体产生严重污染。合流制管道溢流污染己成为部分城市水体水质改善的主要制约因素之一。为了有效控制溢流污染,掌握合流制排水系统出流水量水质特征是十分必要的。本文以巢湖市环城河内中心城区合流制排水系统为研究对象,在居巢区西苑广场(四三酒店旁边)和东风路与巢湖中路交叉口(安德利购物广场对面)各设一个监测取样点,分别进行了6场和3场雨的出流水质水量监测,分析结果表明,雨天合流制管道流量峰值一般滞后于雨强峰值5min～30min,除NH3-N外其它污染物指标的浓度峰值与流量峰值几乎同步出现：雨天污水中NH3-N的主要来源并非管底沉积物和地表污染物,而是生活污水和工业废水。通过对合流制排水系统晴雨天监测数据比较结果表明,雨天污水中COD、TP、SS以及TN一般是旱流污水的几倍之多,有时甚至是旱流污水的几十倍。实测数据显示COD浓度最大值是旱流污水的32倍,SS浓度最大值是旱流污水的75.75倍,TN浓度最大值是旱流污水的2.28倍,TP浓度最大值是旱流污水的10.20倍。为了核算一场降雨中有多少污染物被有效处理,引入了污染物削减率的概念,并基于雨天合流制排水系统出流监测数据推算了不同截流倍数的污染物削减率及其排水系统工程附加投资。对于巢湖市环城河内中心城区而言,截流倍数取4.0其单位投资环境效益实现最大化。本文还建立了污水处理厂处理负荷预测方法,该方法可预测污水处理厂在不同截流倍数下的进水量。若污水处理厂不增设截流污水处理设施,该方法还可用于反推截流倍数的最大值。
[Abstract]:At present, in many old urban areas of China, the system of closure and confluence is used. This kind of drainage system will cause serious pollution to the receiving water body in rainy days. The overflow pollution of the combined flow pipeline has become one of the main restricting factors for the improvement of water quality in some cities. In order to control the overflow pollution effectively, It is necessary to master the characteristics of income quantity in combined drainage system. In this paper, the confluence drainage system in the central urban area of Huancheng River in Chaohu City is studied. A monitoring sampling site is set up at Xiyuan Plaza (next to the four third Hotel) and the intersection of Dongfeng Road and Chaohu Middle Road (opposite the Andely Shopping Square) in Ju Chao District. The water quality and water quantity of 6 and 3 rainfall were monitored respectively. The results show that, The peak value of flow rate of combined flow pipeline in rainy days generally lags behind the peak value of rain intensity for 5 min or 30 min. The peak concentration of other pollutant indexes except NH3-N and the peak value of flow rate almost synchronize: the main source of NH3-N in rainy day sewage is not the bottom sediment and surface pollutant. It's domestic sewage and industrial waste water. By comparing the monitoring data of the combined drainage system on rainy and sunny days, the results show that the COD TPSS and TN in the rainwater are generally several times as many as the dry flow sewage. The measured data show that the maximum concentration of COD is 32 times higher than the maximum of SS of dry flow sewage, and the maximum of TN concentration of dry flow sewage is 75.75 times that of dry flow sewage, and the maximum concentration of TP is 10.20 times that of dry flow sewage. In order to calculate how many pollutants are effectively disposed of in a rainfall, the concept of pollutant reduction rate is introduced. Based on the monitoring data of discharge of combined drainage system in rainy days, the reduction rates of pollutants and the additional investment in drainage system engineering of different intercepting times are calculated. For the central city of Huancheng River in Chaohu City, the reduction rate of pollutants and the additional investment in drainage system engineering are calculated. In this paper, the method of load forecasting for sewage treatment plant is established, and the benefit of investment environment is maximized by taking 4.0 times of closure. This method can be used to predict the water intake of sewage treatment plant under different intercepting times, and it can also be used to push back the maximum of intercepting multiple if the sewage treatment plant does not add intercepting sewage treatment facilities.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU992;X52

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