TAN Zhi-cheng,YU Jian.Optimization of a Novel Combined Sewer Overflow Storage Tank Based on Numerical Simulation[J].China Water & Wastewater,2021,37(23 23):114-121.
Optimization of a Novel Combined Sewer Overflow Storage Tank Based on Numerical Simulation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
23 23
Page:
114-121
Column:
Date of publication:
2021-12-01
- Keywords:
- combined sewer overflow pollution; novel storage tank; computational fluid dynamics; unsteady simulation
- Abstract:
- A novel combined sewer overflow storage tank with an effective volume of 5 000 m3 was proposed to solve the current issues of combined sewer overflow pollution. Three-dimensional solidliquid two-phase flow in the novel storage tank was simulated using computational fluid dynamics software. The internal tank structure was optimized through steady-state simulations in conjunction with orthogonal experiments. The distribution of the physical quantities in the tank was analyzed. The performance of the storage tank in removing the overflow pollution caused by field rainfall was discussed by unsteady simulations. The results under steadystate simulations suggested that the optimal dimensions of the tank with a hydraulic retention time of 0.7 h were as follows: inlet length of 1.6 m, vertical baffle depth of 2 m, horizontal baffle length of 0.75 m, and bottom inclined plate angle of 45°. The removal efficiency of SS in the baffle section was 97.3%. Under unsteady states, the removal efficiency of excess overflow pollution caused by rainfalls with return periods less than one year of the novel storage tank was about twice that of the traditional storage tank with the same volume.
Last Update:
2021-12-01