ZOUAn-ping.Numerical Simulation of Design Volume of Combined Sewer Overflow Storage Tank[J].China Water & Wastewater,2022,38(5):116-121.
Numerical Simulation of Design Volume of Combined Sewer Overflow Storage Tank
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第5期
Page:
116-121
Column:
Date of publication:
2022-03-01
- Keywords:
- combined sewer overflow (CSO); initial rainfall; storage tank; SWMM
- Abstract:
- It is impossible to evaluate the sewage interception performance accurately after storage if the volume of the storage tank is calculated according to the existing design codes. The effect of rainfall intensity and storage tank volume on pollutant interception in a specific watershed was analyzed through numerical simulation of SWMM. Initial rainfall depth with different intensities was set, and the flow process and pollutant flush process of different initial rainfall runoff in a watershed of Longgang District, Shenzhen were simulated. In addition, the relationship between the accumulated collection amount of six pollutants (COD, SS, TN, TP, BOD5 and NH3-N) and the storage tank volume was calculated through numerical simulation. The difference of initial rainfall had no multiple relationships between the peak value and the total amount of pollutants. The flush effect of initial rainfall in descending order was TN, COD, BOD5, NH3-N and SS, and the initial rainfall had no obvious flush effect on TP. The storage capacity should not be less than the volume corresponding to the peak concentration, and it could be appropriately amplified after considering the control efficiency of multiple pollutants. In this case, the concentration of pollutants in the storage tank decreased rapidly at first and then slowed down after the peak value. When the storage capacity was less than 10 000 m3, relatively high collection efficiency was still obtained. When the main control object and target value of the storage tank are different, the storage volume should be determined after a comprehensive consideration.
Last Update:
2022-03-01