Abstract
Taking a certain area of a coastal city as the research object, based on the measured data, the model of rainwater pipe network and the hydraulic model of sewage pipe network in the study area were established based on SWMM. According to the set interception target combined with the established SWMM rainwater network model, the specific volume of Rain Water in the initial stage of each Rain Water discharge port is calculated, which is given to the sewage trunk pipe in the form of time series to realize the initial Rain Water interception control and analyze the receiving capacity of the sewage pipe network. In this study, 20% of the initial Rain Water was set up in the study area, which was given in the form of time series to the nodes in the sewage pipe network model. After the initial Rain Water was cut off 20%, part of the pipe segment and the node appeared overload phenomenon, but there was no overflow. After 30% initial Rain Water interception, overflow occurred in some pipe segments.
Highlights
With the rapid development of the city, the urban drainage network and sewage treatment facilities are becoming more and more perfect
Rain Water carried a large number of pollutants such as heavy metal ions in the initial stage, and the urban water environment was seriously polluted by diverging drainage system into the natural water body
The results show that the concentration of Rain Water pollutants is very high in the separation system, especially in the initial stage of Rain Water, and the initial concentration of Rain Water pollutants is even higher than that of some domestic a Corresponding author: Lvmou1@163.com sewage
Summary
With the rapid development of the city, the urban drainage network and sewage treatment facilities are becoming more and more perfect. The rainwater and sewage separation drainage system is a relatively reasonable scheme, but pollution of Initial Rain Water is quite serious [2]. The distributary drainage system can reduce the impact of rainfall on sewage treatment plants and drainage networks, at the beginning of the Rain Water, a large amount of polluting gases in the air were dissolved, dropped to the ground and washed over the roof, and roads. Rain Water carried a large number of pollutants such as heavy metal ions in the initial stage, and the urban water environment was seriously polluted by diverging drainage system into the natural water body.
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