» Articles » PMID: 35886165

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

Overview
Publisher MDPI
Date 2022 Jul 27
PMID 35886165
Authors
Affiliations
Soon will be listed here.
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.

References
1.
Tay J, Liu Y, Tay S . High organic loading influences the physical characteristics of aerobic sludge granules. Lett Appl Microbiol. 2002; 34(6):407-12. DOI: 10.1046/j.1472-765x.2002.01108.x. View

2.
Bumbac C, Ionescu I, Tiron O, Badescu V . Continuous flow aerobic granular sludge reactor for dairy wastewater treatment. Water Sci Technol. 2015; 71(3):440-5. DOI: 10.2166/wst.2015.007. View

3.
Tao C, Zhang Y, Hottinger D, Jiang J . Asymmetric airflow and vibration induced by the Coanda effect in a symmetric model of the vocal folds. J Acoust Soc Am. 2007; 122(4):2270-8. DOI: 10.1121/1.2773960. View

4.
Othman I, Anuar A, Ujang Z, Rosman N, Harun H, Chelliapan S . Livestock wastewater treatment using aerobic granular sludge. Bioresour Technol. 2013; 133:630-4. DOI: 10.1016/j.biortech.2013.01.149. View

5.
French J, Guntheroth W . An explanation of asymmetric upper extremity blood pressures in supravalvular aortic stenosis: the Coanda effect. Circulation. 1970; 42(1):31-6. DOI: 10.1161/01.cir.42.1.31. View