基于SWMM的截流式排水系统溢流研究与对策

Overflow of Intercepted Separate Drainage System and Its Countermeasures Based on SWMM

雨污混接与初期雨水污染问题使分流制排水系统难以发挥预期环境效益,截流式分流制排水系统是对传统分流制排水系统的一种改进。以某一商业住宅区域为例,运用SWMM模型模拟不同典型降雨条件下各类污染物的排放情况,并利用模型评估截流井升级改造、新建调蓄设施和泵站运行优化3种溢流控制对策。结果表明,截流井改造能大幅降低污染物溢流量,新建调蓄设施在降雨量较小时削减效果较为明显,而通过泵站运行方式优化在某种程度下不仅能降低工程投资,还能提高整个污水处理系统的效率。

The pollution of combined sewer system and initial rain water makes it difficult for the separate drainage system to exert the expected environmental benefits.The intercepted separate drainage system is an improvement over the traditional separate system.The discharge of major pollutants under different typical rainfall conditions in a residential and commercial area was simulated by using SWMM model.Three overflow control measures was proposed including upgradation of the interception well,construction of new storage facility and optimization of pumping station operation.The results showed that overflow pollutants could be significantly reduced by upgradation of the interception manholes.The effect of new storage facility was obvious when the rainfall was small.However,optimization of pumping station operation could not only reduce the project investment to some extent,but also improve the efficiency of the entire sewage treatment system.