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通过对上海市中心城区典型分流制系统Z泵站汛期降雨放江水质水量分析,在调查系统服务区特点、泵站运行和开展现场实测的基础上,得出如下结论:(1)由于管网系统混接情况严重,加上高水位运行、雨前预抽空等原因,Z泵站汛期放江频率高,污染严重;(2)放江污染物的EMC在不同雨型情况下表现不同,溶解性污染物随降雨量的增大而降低,而包含悬浮物的污染指标呈先升后降的变化趋势,这主要与管道沉积物特征有关;(3)随着降雨量的增大,泵站的放江负荷量显著增加。在同等降雨条件下,前峰雨使得泵站放江污染负荷远大于后峰雨;(4)受雨型与预抽空的影响,不论小雨、中雨、大雨,SS初期效应均不显著;COD与TP主要来源于管道沉积污染物,初期效应显著;溶解态污染物初期效应显著,不受降雨雨量与雨型的影响;(5)为有效降低Z泵站降雨放江污染负荷,提出包括雨污混接改造、优化泵站运行、提高截流能力、疏通管道等措施在内的污染控制策略。
Based on the analysis of the water quality and quality of rainwater discharged by the Z pumping station during the flood season in the typical diversion system of downtown Shanghai, the following conclusions are drawn: (1) Due to the characteristics of the service network of the system, the operation of the pumping station and the on- System mixing serious situation, coupled with high water level operation, pre-rain ahead of time and other reasons, Z pumping station flood season discharge frequency is high, serious pollution; (2) release of pollutants in the river EMC performance under different rain types, dissolved The amount of sexual pollutants decreased with the increase of rainfall, while the pollution index including suspended matter increased first and then decreased, which was mainly related to the characteristics of pipeline sediment. (3) With the increase of rainfall, The discharge of river significantly increased. Under the same conditions of rainfall, the peak rainfall caused the discharge load of pumping station to be much larger than that of the post-peak rainfall; (4) The initial effect of SS was not significant under the conditions of rain-type and pre-pump-down, And TP mainly come from pipeline sedimentation pollutants, the initial effect is significant; initial effect of dissolved pollutants is significant, not affected by rainfall and rainfall type; (5) In order to effectively reduce the Z pumping station rainfall discharge river pollution, including rain Pollution mixing and transformation, optimizing the pumping station operation, improve interception capacity, clear the pipeline and other measures, including pollution control strategy.