银川市某高密度城区合流制溢流污染特性研究

针对合流制管网系统溢流污染严重且易造成受纳水体出现黑臭现象等问题，以银川市第一污水处理厂片区为例，基于雨洪管理模型(SWMM),在短历时设计降雨和典型年长历时降雨条件下，模拟分析了研究区域溢流排口溢流量及溢流污染物负荷对不同降雨条件的响应关系及其对受纳水体水质的影响。结果表明：雨天合流制管网系统的溢流量及溢流污染负荷量较大，且无论是短历时还是长历时降雨条件下，均具有随着降雨量的增加而增大的特点；厂前溢流污染浓度大，超过受纳水体自净能力，短期内水体水质处于黑臭状态。本研究对银川市黑臭水体治理及溢流污染防治方案的制订具有重要的参考价值。

Pollution characteristics of combined sewer overflow in a high density urban area of Yinchuan City

In view of the serious sewer overflow pollution of the combined pipe network system and the black and odorous phenomenon of the receiving water body, taking the Yinchuan No.1 Sewage Treatment Plant area as an example, the SWMM model is adopted for the simulation study under the conditions of short duration design rainfall and typical year long duration rainfall. The response of the overflow discharge and overflow pollutant load of the study area to different rainfall conditions and their impact on the water quality of the receiving water body are simulated and analyzed. The results show that in rainy days, the overflow and overflow pollution load of the combined pipe network system were large, and they increased with the increase of rainfall under both short-term and long-term rainfall conditions. The overflow pollution in front of the plant was highly concentrated, which exceeded the self-purification capacity of the receiving water body, and the water quality was in a black and odorous state in a short time. This study is of important referential value to the treatment of black and odorous water and the formulation of overflow pollution control plan in Yinchuan City.