CFD Simulation of the Flow Patterns and Structure Optimization within a Continued-Flow Integrated Biological Reactor
Yu Cai 3
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School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
College of Environmental Engineering, Wuhan Textile University, Wuhan, 430200, China
Construction Project Management Center of Jiang’an District, Wuhan, 430070, China
Wuhan Planning & Design Co., LTD, Wuhan, 430070, China
School of Information and Safety Engineering, Zhongnan University of Economics and Law, 430073, China
Three Gorges Base Development, Co. Ltd, Yichang, Hubei 443002, PR China
Zhenxing Zhong   

Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, China, 430074, wuhan, China
Submission date: 2021-01-12
Final revision date: 2021-04-29
Acceptance date: 2021-05-14
Online publication date: 2022-02-04
Publication date: 2022-03-22
Pol. J. Environ. Stud. 2022;31(2):1737–1746
The fluid patterns and structure optimization of a novel continued-flow integrated biological reactor (CIBR) were explored by using the computational fluid dynamics (CFD). The results of the CFD simulation revealed that both the liquid velocity field and the gas volume fraction in the CIBR showed an axisymmetric spatial distribution. Furthermore, increasing the aperture sizes of below diversion holes from 2 cm to 8 cm could significantly enhance the turbulent kinetic energy of three-phase separation zone. Consequently, the solid-liquid separation and the treatment efficiency of CIBR were enhanced. In addition, an increase in the angle of the inclined plate (from 35° to 45° and further to 50°) caused increases in the liquid velocity, volatility and gas holdup in the threephase separation zone, while decreased gradually in the settling zone. These changes improved gasliquid separation in the three-phase separation zone and the sludge sedimentation in the settling zone. The findings of the study provide an insight into the fluid characteristics of gas-liquid-solid three phases within the CIBR.