北运河上游合流制管网溢流污染特性研究  

Characteristics of the combined sewer overflows pollution in the upper North Canal of Beijing

作　　者：海永龙 郁达伟[1,2] 刘志红 钱晓辉 柳蒙蒙[1,2,3] 狄斐 王拓 岳文慧 胡大洲 梁玉帅 魏源送 HAI Yonglong;YU Dawei;LIU Zhihong;QIAN Xiaohui;LIU Mengmeng;DI Fei;WANG Tuo;YUE Wenhui;HU Dazhou;LIANG Yushuai;WEI Yuansong(State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085;Laboratory of Water Pollution Control Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085;University of Chinese Academy of Sciences,Beijing 100049;Changping Water Authority,Beijing 102200)

机构地区：[1]中国科学院生态环境研究中心,环境模拟与污染控制国家重点联合实验室,北京100085 [2]中国科学院生态环境研究中心,水污染控制实验室,北京100085 [3]中国科学院大学,北京100049 [4]昌平区水务局,北京102200

出　　处：《环境科学学报》2020年第8期2785-2794,共10页Acta Scientiae Circumstantiae

基　　金：国家水体污染控制与治理科技重大专项(No.2017ZX07102,2017ZX07102⁃002)。

摘　　要：以北运河沙河水库周边合流制管网为研究对象,选取浊度为主要指示指标,通过监测典型溢流排口,考察了2019年4次合流制管网溢流污染物的变化过程,研究了降雨事件之间的干旱天数和降雨强度对溢流污染的影响,并分析浊度和典型污染物之间的相关性.结果表明,汛期降雨强度较大、历时较长,是溢流事件发生的主要时期.当单场次累积降雨量达到15 mm和单场次平均降雨强度达到1.4 mm·h^-1时,溢流开始发生.其中,4月24日(第一次溢流)和汛期7月22日(干旱天数为23 d,降雨强度最强)的初期溢流污染最为严重,这两次溢流污水中TN、TP、TCOD都与浊度显著相关(p<0.01);5月26日(非汛期典型降雨)的溢流污染物与浊度相关性不显著(p>0.05),污染负荷较低.这说明北运河上游沙河水库周边合流制管网溢流污染主要受降雨强度和干旱天数的影响.因此,以年总溢流污染负荷为控制目标时,应优先控制年度初次溢流和主汛期初次溢流的初期溢流污染.A study was carried out to investigate the combined sewer overflows(CSOs) pollution at the upper North Canal, and turbidity was selected as the main indicator for CSOs pollution. Through investigating changes of CSOs pollutants during 4 rainfall events in 2019, the effect of dry days and rainfall intensity on CSOs pollution was analyzed, as well as the correlation between turbidity and typical pollutants in this study. Results suggested that the CSOs mainly occurred in the rain season due to the higher rainfall intensity and longer rainfall duration. The CSOs occurred at the accumulated precipitation over 15 mm and the average intensity up to 1.4 mm·h^-1. The heavier polluted initial CSOs occurred at the first overflow on Apr. 24 and the overflow on July 22 due to the intensive rainfall after 23 days rain free period. During these two CSOs events, concentrations of TN, TP, and TCOD significantly correlated with the turbidity(p<0.01). However, there is no significant correlation(p>0.05) observed between concentrations of TN, TP, and TCOD and turbidity due to low pollutants loading of the CSOs occurred on May 26. In a word, the CSOs pollution was mainly affected by rainfall intensity and rain free period in the upper North Canal, Beijing. Therefore, it is of great importance to control the initial overflow pollutants of both the first CSOs in the year and the first CSOs in the main flood season, with aiming to control annual CSOs pollution loading.

关 键 词：北运河上游 合流制溢流污染 降雨强度 浊度 

分 类 号：X522[环境科学与工程—环境工程]