Simulation on the Reduction of Urban Non-point Source Pollution by Storage Tank under Continuous Rainfall Conditions
At present,china's water environment remediation work has achieved phased success.The problem of point source pollution has been solved to a large extent,while the problem of urban non-point source pollution problem has increasingly become the difficulty of water environmental governance.In order to solve this problem effectively,a SWMM model for non-point source pollution control of stormwater storage basin was constructed taking the Sanba River Basin in Xuzhou Economic Development Zone as the research area.By editing the control rule for pump opening and closing in the Control editor module to control the automatic drainage of the reservoir,and by setting the pump flow rate by pump curve TYPE1 to control the emptying time,the regulation times and the pollutant reduction rate of the terminal storage tank under he condition of measured rainfall for many years were analysed.The results show that the regulation times and pollutant reduction rate of the storage tank are greatly affected by its emptying time,but are less affected by its operating rules.Under the same operating rules,the 24 h empting of the storage tank is higher than the 48 h empting,which can increase the average number of adjustment times by 11.8 times(the pump is started 24 hours after rainfall)and 12.9 times(the pump is started 48 hours after rainfall),respectively.The average COD and TN reduction rates can be increased by 2.28%-2.92%(24 hours of rainfall pump)and 2.2%-2.59%(48 hours of rainfall pump),respectively.
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