分流制雨水管网滞留污染物的估算研究

为了定量研究降雨时分流制雨水管网滞留污染物占总污染物的比例,对某研究区域雨水管网中的滞留污染物定期取样检测,并根据研究区域的基础数据建立SWMM模型。同时,提出了一种雨水管网滞留污染物的计算方法,即以检测到的雨水管网污染物浓度及充满度计算滞留污染物质量。将滞留污染物数据输入SWMM模型中,分析对比有无滞留污染物的管网排放口污染物浓度的变化情况。模拟结果表明,在1年一遇的降雨条件下,雨水系统内的滞留污染物对COD、NH3-N、TP总污染负荷的贡献率分别为43. 30%、92. 75%、58. 83%,雨水管网滞留污染物占雨水管网总污染物的比例较大。

Estimation of Retained Pollutants in Separate Rainwater Pipeline Network

In order to quantitatively calculate the proportion of retained pollutants in a separate rainwater pipeline network to the total pollutants during rainfall conditions,the retained pollutants in the rainwater pipeline network of a research area were sampled and detected periodically,and the SWMM model was established based on the basic data of the research area.In addition,a method for calculating the amount of retained pollutants in the rainwater pipeline network was proposed,which was to calculate the amount of retained pollutants based on the detected pollutant concentration and depth ratio of the rainwater pipeline network.The data of retained pollutants were inputted into the established SWMM model,and the change of pollutant concentration at the outlet of the pipeline network with and without retained pollutants were analyzed and compared.The simulation results showed that the contribution rates of retained pollutants in the rainwater system to COD,NH 3-N and TP pollutant loads were 43.30%,92.75%and 58.83%,respectively.It could be concluded that the proportion of retained pollutants in the total pollutants of rainwater pipeline network was large.