上海市中心城区雨天溢流事件初期效应探究

Preliminary Study on the Effects of Rainwater Overflow in the Central Urban Area of Shanghai

摘要:

选取上海市中心城区4个典型排水系统为研究对象（分流制、合流制各2个），采用分钟级水质在线监测数据为支撑，以COD和NH₃-N为主要水质指标，探究各典型排水系统在不同雨型情况下的溢流污染水质特征及初期效应。结果表明：COD和NH₃-N两项水质指标的初期雨水效应均在分流制系统内表现更明显；并且，COD指标的初期效应在分流制系统内小雨工况以及合流制系统内大雨工况下表现更明显；NH₃-N指标的初期效应在分流制系统内中雨和大雨工况以及合流制系统内均表现明显。

Abstract:

The research object was chosen to be four typical drainage systems in the central urban area of Shanghai (two separate and two combined systems). Minute level water quality online monitoring data was used as the support, to examine the features and first flush effect of overflow pollution on water quality in various drainage systems under diverse rainfall conditions, using COD and NH₃-N as the main indicators.The results showed that the first flush effect of COD and NH₃-N water quality indicators were more pronounced in the diversion system; Moreover, the first flush effect of COD indicators was more pronounced under light rain conditions in separate flow systems and heavy rain conditions in combined flow systems; Both moderate and heavy rain conditions in separate and combined flow systems exhibited the first flush effect of NH₃-N indicators.