合流制分区排水系统溢流污染负荷评估与治理

Assessment and Treatment of Overflow Pollution Load in Combined Partition Drainage System

以长沙市小西门排渍泵站服务片区为例,针对该片区合流制分区排水系统溢流污染问题,通过MIKE URBAN模型建立水质水量模型。根据小雨、中雨、大雨及暴雨等典型降雨对研究区进行场次污染特征分析,以2016年全年降雨对研究区进行连续模拟,得到全年溢流污染负荷。针对雨季溢流污染提出3种治理方案,得出高低区单独截污+提高截流倍数+调蓄池的治理方案最优,可使研究区的全年溢流次数降低至33次,COD、NH3-N、TP的溢流负荷削减率依次提高到52.81%、61.30%、64.59%。

Aiming at the overflow pollution problem of a combined partition drainage system in service area of Xiaoximen pump station in Changsha City,a water quality and quantity model was established by using MIKE URBAN.The event pollution characteristics of the study area were analyzed based on typical rainfall such as light rain,moderate rain,heavy rain and rainstorm,and the overflow pollution load in the whole year was obtained by continuous simulation of rainfall in 2016.Three measures for overflow pollution control in rainy season were proposed,and the optimal solution was single sewage interception in high and low areas,increase of interception ratio and setting detention tank,which could reduce the annual overflow times in the study area to 33 times,and increase the overflow load reduction rate of COD,NH3-N and TP to 52.81%,61.30%and 64.59%,respectively.