“灰绿”协同措施对银川市合流制溢流污染的影响  

Influence of“grey-green”synergistic measures on combined sewer overflow pollution in Yinchuan City

作　　者：侯精明 栾广学 王添[1] 杨露[1] 银雅伦 李欣怡 乔梦曦 HOU Jingming;LUAN Guangxue;WANG Tian;YANG Lu;YIN Yalun;LI Xinyi;QIAO Mengxi(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an 710048,China;CAUPD Beijing Planning&Design Consultants Ltd.,Beijing 100044,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]中规院(北京)规划设计有限公司,北京100044

出　　处：《水资源保护》2022年第3期43-49,86,共8页Water Resources Protection

基　　金：中德合作交流项目(M-0427);国家自然科学基金(52009104,52079106)。

摘　　要：针对合流制管网系统在雨天溢流污染严重,造成城市水体黑臭现象的问题,以银川市某高密度城区合流制管网系统为例,基于SWMM模型,在短历时设计降雨和长历时设计降雨两种条件下,模拟分析了合流制溢流(CSO)调蓄池、雨污管道混错接改造、绿化带海绵化改造等“灰绿”协同措施对CSO污染的影响。结果表明:CSO调蓄池、雨污管道混错接改造、绿化带海绵化改造及“灰绿”措施结合4种方案在短历时、长历时设计降雨条件下,随着降水量的增加,溢流水量及溢流污染物负荷均增加,溢流削减率均逐渐减小,其中“灰绿”措施结合方案对溢流污染的削减效果最为显著;重现期小于5 a时,溢流水量削减率与溢流污染物负荷削减率基本达到80%;降雨条件为中雨时,污染物负荷削减率基本达到75%;重现期为20 a时,溢流水量削减率及TSS、COD、TP、NH^(+)_(4)-N负荷削减率分别达到64%、70%、70%、70%、70%;降雨条件为大雨时,溢流水量削减率及TSS、COD、TP、NH^(+)_(4)-N负荷削减率分别达到28%、32%、26%、31%、33%。Aiming at the problem of serious overflow pollution and black odor of urban water body in rainy days,taking the combined pipe network system in a high-density urban area of Yinchuan City as an example,based on SWMM model,under the conditions of short-term design rainfall and long-term design rainfall,the impact of“grey-green”synergistic measures,such as combined sewer overflow(CSO)storage tank,mixed and wrong connection of rainwater and sewage pipelines and sponge transformation of green belt,on CSO pollution were simulated and analysed.The results show that under the short-term and long-term design rainfall conditions,four schemes of CSO storage tank,mixed and wrong connection of rainwater and sewage pipelines,sponge transformation of green belt,and“gray-green”combination measure,can lead to the increase of the amount of overflow water and the load of overflow pollutants with the increase of precipitation,and the overflow reduction rate decreases gradually.Among them,the“gray-green”combination measure has the most significant effect on the reduction of overflow pollution.When the return period is less than 5 a,the reduction rate of overflow water volume and the reduction rate of overflow pollutant load basically reach 80%.When the rainfall condition is moderate rain,the pollutant load reduction rate basically reaches 75%.When the return period is 20 a,the reduction rates of overflow water and the load reduction rates of TSS,COD,TP and NH^(+)_(4)-N reach 64%,70%,70%and 70%,respectively.When the rainfall condition is heavy rain,the reduction rates of overflow water and the load reduction rates of TSS,COD,TP and NH^(+)_(4)-N reach 28%,32%,26%,31%and 33%,respectively.

关 键 词：合流制溢流 “灰绿”协同措施 溢流污染物负荷 溢流水量 SWMM模型 银川市 

分 类 号：TV131.2[水利工程—水力学及河流动力学]