Comparison and Optimization of Continuous Flow Reactors for Aerobic Granule Sludge Cultivation from the Perspective of Hydrodynamic Behavior

Xinye Jiang, Hongli Li, Qingyu Zhao, Peng Yang, Ming Zeng, Du Guo, Zhiqiang Fu, Linlin Hao and Nan Wu
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Xinye Jiang: College of Marine and Environmental Sciences, Tianjin University of Science &Technology, Tianjin 300457, China
Hongli Li: College of Marine and Environmental Sciences, Tianjin University of Science &Technology, Tianjin 300457, China
Qingyu Zhao: College of Marine and Environmental Sciences, Tianjin University of Science &Technology, Tianjin 300457, China
Peng Yang: Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Ming Zeng: College of Marine and Environmental Sciences, Tianjin University of Science &Technology, Tianjin 300457, China
Du Guo: College of Marine and Environmental Sciences, Tianjin University of Science &Technology, Tianjin 300457, China
Zhiqiang Fu: School of Light Industry Science and Engineering, Tianjin University of Science &Technology, Tianjin 300457, China
Linlin Hao: College of Marine and Environmental Sciences, Tianjin University of Science &Technology, Tianjin 300457, China
Nan Wu: College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China

IJERPH, 2022, vol. 19, issue 14, 1-17

Abstract: Improving treatment efficiency and reducing investment and operating costs make aerobic granular sludge technology (AGS) a promising technology for treating aquaculture wastewater. The development of continuous flow reactors (CFRs) has become a new direction in the research of AGS. This study clarifies the granulation effect, hydrodynamic behavior and particle separation of three different CFRs (R1 to R3). The established CFD model was able to explain the hydrodynamic behavior in all three CFRs; in particular, R3 performed the best from the perspective of hydrodynamic behavior due to its abundant turbulence. In addition, the optimal baffle distance and baffle angle of R3 were simulated to be 40 mm and 60°, respectively, due to them providing the best turbulent flow and particle separation effect. However, an overlarge baffle angle could weaken the turbulent pattern in the reactor. The retention time distribution further confirmed the reasonability of these optimal parameters with the highest effective volume ratio of 0.82. In short, this study gives an instruction for exploring the rapid formation mechanism of AGS in a CFR to promote its engineering application.

Keywords: aquaculture wastewater; aerobic granule sludge; continuous flow reactors; CFD; hydrodynamic behavior (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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