CFD simulation of mechanical draft tube mixing in anaerobic digester tanks

Water Research
Robert N Meroney, P E Colorado

Abstract

Computational Fluid Dynamics (CFD) was used to simulate the mixing characteristics of four different circular anaerobic digester tanks (diameters of 13.7, 21.3, 30.5, and 33.5m) equipped with single and multiple draft impeller tube mixers. Rates of mixing of step and slug injection of tracers were calculated from which digester volume turnover time (DVTT), mixture diffusion time (MDT), and hydraulic retention time (HRT) could be calculated. Washout characteristics were compared to analytic formulae to estimate any presence of partial mixing, dead volume, short-circuiting, or piston flow. CFD satisfactorily predicted performance of both model and full-scale circular tank configurations.

References

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Feb 3, 2005·Biotechnology and Bioengineering·Mehul S Vesvikar, Muthanna Al-Dahhan

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Citations

Jun 15, 2013·Water Research·K J CraigL J Niemand
Mar 8, 2016·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Eduardo Hernandez-AguilarJuan M Méndez-Contreras
Aug 18, 2016·Environmental Technology·Fengping WangShuhao Huo
Nov 17, 2009·Water Research·Binxin Wu
Apr 2, 2020·Critical Reviews in Biotechnology·Buta SinghZoltán Siménfalvi
Jul 10, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Yohannis Mitiku ToboIngmar Nopens
Jul 4, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·U BergamoC Gualtieri
Jul 11, 2018·Water Research·Ibrahim Denka KariyamaBinxin Wu
Jul 23, 2021·Bioprocess and Biosystems Engineering·Soroush DabiriWolfgang Rauch

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