TONGYu,CHENGYangshuo,HOUJingming,et al.Research on Optimal Regulation Mode of CSO Storage Tank Based on Water Quality Indicators[J].China Water & Wastewater,2026,42(7):122-129.
基于水质指标的CSO调蓄池优化调控模式研究
- Title:
- Research on Optimal Regulation Mode of CSO Storage Tank Based on Water Quality Indicators
- Keywords:
- combined sewer overflow pollution; storage tank; optimization of control; overflow characteristics; storm water management model (SWMM)
- 摘要:
- 基于城市雨洪管理模型（SWMM），以渭南市典型合流制片区为例，构建多阀门调控的合流制溢流（CSO）污染数值模型。通过模拟研究区域在不同设计降雨重现期下的排水排污过程，分析CSO调蓄池与溢流排口分流前的管网关键节点、溢流排口现状及优化调控下的合流制溢流污染规律，提出基于水质指标的CSO调蓄池优化调控策略。结果表明，在不同降雨强度下，以最小污染负荷溢流为目标的生活污水总悬浮固体（TSS）浓度调控阈值为8 mg/L，即CSO调蓄池在TSS浓度高于此值时开启并收集合流污水。在1、5、20、50和100年一遇降雨条件下，现状生活污水TSS溢流负荷分别为0、0.58、0.88、1.01和1.05 t，经优化调控后分别为0、0.47、0.70、0.82和0.87 t，其中20年一遇降雨条件下的TSS溢流负荷削减率高达20.5%。该调控方法在维持CSO调蓄池设计容积不变的条件下，可显著削减CSO污染负荷，从而有效降低受纳水体的污染风险。
- Abstract:
- Based on the urban storm water management model (SWMM), this study constructed a numerical model of combined sewer overflow (CSO) pollution controlled by multiple valves, taking a typical combined sewer area in Weinan City as a case study. By simulating the drainage and pollutant discharge processes in the study area under different design rainfall return periods, the key nodes of the pipe network at the junctions of the CSO storage tank and overflow discharge outlet before separation were analyzed, and the overflow pollution patterns of the combined sewer system under optimal control were examined. Optimization strategies for the CSO storage tank based on water quality indicators were proposed. The results showed that under different rainfall intensities, the regulation threshold for the total suspended solids (TSS) concentration in domestic sewage, with the goal of minimizing pollution load overflow, was 8 mg/L. That was, the CSO storage tank was activated to collect combined sewage when the TSS concentration exceeds this value. Under conditions of 1-, 5-, 20-, 50-, and 100-year return period rainfall, the baseline TSS overflow loads of domestic sewage were 0 t, 0.58 t, 0.88 t, 1.01 t and 1.05 t, respectively, while those after optimal control were reduced to 0 t, 0.47 t, 0.70 t, 0.82 t, and 0.87 t. Notably, the TSS overflow load reduction rate reached 20.5% under the 20-year return period rainfall condition. The control method proposed in this study can significantly reduce CSO pollution loads while maintaining the designed volume of the CSO storage tank, thereby effectively mitigating the pollution risk to receiving water bodies.
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