Abstract:Xunsi river area of Wuhan was taken as an example, aiming at the problems of urban water logging and black and odor problem in the urban inland river caused by sewage overflow in combined sewer network, the storm water management model (SWMM) software was used to establish the hydraulic and water quality model of the combined drainage networks. Both the rainstorm at different rainfall intensities and the annual rainfall were simulated, and the overflow pollution properties in the region were analyzed. The reasonable modification schemes for combined sewer drainage system in Xunsi river basin were proposed, and the overflow water volume and water quality control effects were simulated under different schemes by using of the SWMM. The results showed that under the joint action of culvert and storage tank, the interception ratio of overflow sewage volume was above 90%, the annual overflow times were less than 10, annual overflow water volume reduced by 17.517 million m3 on average, all the interception ratios of contaminant were above 95%. The COD, NH3-N, TP and SS entering the surface water through overflow dropped by 3 295.5, 505.8, 63.1 and 1 981.1 t every year, respectively. The overflow problem could be greatly alleviated, and the overflow pollution could be well controlled. With the increase of the recurrence period of rainstorm, the interception effect decreased. The combination of culvert and storage tank had significant reduction and control effects on overflow sewage, which could lower the risk of urban water logging and black and odor problem in the urban inland river. Through quantitative characterization of the control effect on overflow pollution by the combination of culvert and storage tank, this study provides a scientific basis for renovation of domestic combined drainage network and sponge city design in China. Key words:combined sewer overflows(CSOs)/ combined drainage network/ storm water management model(SWMM)/ rainwater storage tank.
图1不同重现期设计暴雨强度 Figure1.Hyetography of the design storms with different return periods
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School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China Received Date: 2019-02-18 Accepted Date: 2019-07-31 Available Online: 2020-03-02 Keywords:combined sewer overflows(CSOs)/ combined drainage network/ storm water management model(SWMM)/ rainwater storage tank Abstract:Xunsi river area of Wuhan was taken as an example, aiming at the problems of urban water logging and black and odor problem in the urban inland river caused by sewage overflow in combined sewer network, the storm water management model (SWMM) software was used to establish the hydraulic and water quality model of the combined drainage networks. Both the rainstorm at different rainfall intensities and the annual rainfall were simulated, and the overflow pollution properties in the region were analyzed. The reasonable modification schemes for combined sewer drainage system in Xunsi river basin were proposed, and the overflow water volume and water quality control effects were simulated under different schemes by using of the SWMM. The results showed that under the joint action of culvert and storage tank, the interception ratio of overflow sewage volume was above 90%, the annual overflow times were less than 10, annual overflow water volume reduced by 17.517 million m3 on average, all the interception ratios of contaminant were above 95%. The COD, NH3-N, TP and SS entering the surface water through overflow dropped by 3 295.5, 505.8, 63.1 and 1 981.1 t every year, respectively. The overflow problem could be greatly alleviated, and the overflow pollution could be well controlled. With the increase of the recurrence period of rainstorm, the interception effect decreased. The combination of culvert and storage tank had significant reduction and control effects on overflow sewage, which could lower the risk of urban water logging and black and odor problem in the urban inland river. Through quantitative characterization of the control effect on overflow pollution by the combination of culvert and storage tank, this study provides a scientific basis for renovation of domestic combined drainage network and sponge city design in China.
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