CHENHuang-jun,LIYi-ping,ZHOUYu-xuan,et al.Characteristics of Rainy-weather Overflow Pollution from Separate System in Illicit Connection[J].China Water & Wastewater,2023,39(19):116-124.
分流制系统雨水管网混接雨天溢流污染特征研究
- Title:
- Characteristics of Rainy-weather Overflow Pollution from Separate System in Illicit Connection
- Keywords:
- separate system; illicit connection between storm and sewage sewers; sewer overflow; pollution characteristics; particle size distribution; influencing factor
- 摘要:
- 分流制雨污混接系统雨天溢流污水是导致城市水体黑臭的重要原因。选择南宁市老城区存在雨污混接的雨水排口的溢流污水进行采样监测，分析溢流污水水质变化和颗粒物粒径分布情况，探讨降雨强度、降雨历时、前期干旱时间等对溢流污水颗粒物粒径分布的影响。结果表明，溢流污水COD、NH3-N和TN浓度分别超过地表水Ⅴ类水质标准4.7、4.1和6.4倍，浓度在降雨强度最大值后10 min内达到峰值。溢流污水中10~125 μm的颗粒物最多，占总颗粒的60%。降雨径流和管道沉积物对溢流污水皆有较大贡献，降雨径流中4~63 μm的颗粒物占总颗粒的30%，主要贡献溢流污水中的小颗粒物；管道沉积物中主要是粒径>250 μm的颗粒物，是溢流污水中大颗粒物的贡献者。降雨强度会影响溢流污水中颗粒物粒径分布，其中63~125 μm颗粒物体积分数与降雨强度呈显著负相关（P<0.05）。
- Abstract:
- The sewer overflow of the separate system with mixing of the rainwater and sewage is an important source of black odor in urban water. In this study, sewer overflow from rainwater drains with mixed rain-sewage connection in the old urban area of Nanning City was sampled and monitored to explain the water quality changes of sewer overflow and particle size distribution, and to explore the influence of rainfall intensity, rainfall duration and previous dry time on particle size distribution of sewer overflow. The results showed that the concentrations of COD, NH3-N and TN in the overflow sewage were 4.7 times, 4.1 times and 6.4 times higher than the surface water quality standard Ⅴ class, and the pollutants concentration reached the peak within 10 minutes after the maximum rainfall intensity. The particulate matter of 10-125 μm was the most in overflow sewage, accounting for 60% of the total particles. Both rainfall runoff and pipe sediment contributed significantly to the sewer overflow, and the particulate matter of 4-63 μm in rainfall runoff accounts for 30% of the total particles, mainly contributing to the small particulate matter in overflow sewage. Particulate matter greater than 250 μm was mainly found in the pipeline sediments, mainly contributing to the large particulate matter in sewer overflow. Rainfall intensity could affect the particle size distribution in overflow sewage, and the particle volume fraction in the particle size range of 63-125 μm had a significant negative correlation with rainfall intensity (P<0.05).
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