分流制系统雨水管网混接雨天溢流污染特征研究  

Characteristics of Rainy-weather Overflow Pollution from Separate System in IllicitConnection

作　　者：陈黄隽 李一平[1] 周玉璇 潘泓哲 赵思索 王海英 蒋海砖 CHEN Huang-jun;LI Yi-ping;ZHOU Yu-xuan;PAN Hong-zhe;ZHAO Si-suo;WANG Hai-ying;JIANG Hai-zhuan(College of Environment,Hohai University,Nanjing 210098,China;Nanning Exploration&Survey Institute,Nanning 530022,China)

机构地区：[1]河海大学环境学院,江苏南京210098 [2]南宁市勘测设计院集团有限公司,广西南宁530022

出　　处：《中国给水排水》2023年第19期116-124,共9页China Water & Wastewater

基　　金：国家自然科学基金重点项目(52039003)。

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10~125μm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4~63μm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>250μm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63~125μm颗粒物体积分数与降雨强度呈显著负相关(P<0.05)。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,NH_(3)-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 pllutants concentration reached the peak within 10 minutes after the maximum rainfall intensity.The particulate matter of 10-125μm 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 4-63μm in rainfall runoff accounts for 30%of the total particles,mainly contributing to the small particulate matter in overflow sewage.Particulate matter greater than 250μm 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 63-125μm had a significant negative correlation with rainfall intensity(P<0.05).

关 键 词：分流制系统 雨污混接 溢流污水 污染特征 粒径分布 影响因素 

分 类 号：TU992[建筑科学—市政工程]