Characterization and quantitively analysis on the high solid anaerobic digestion in the large scale Stirred Tank Reactor

Xiang Fang, Xueren Li, Xiujin Li, Jiaqi Fan, Yihuan Yan and Jiyuan Tu

Renewable Energy, 2025, vol. 241, issue C

Abstract: While high solid anaerobic digestion has the potential to produce more biogas with the same anaerobic reactor, its rheological behavior can lead to short-circuiting and dead zones, significantly limiting the anaerobic fermentation efficiency. This study numerically investigates the sludge movement in an industrial-scale continuously stirred tank reactor and explores the dynamic characteristics of the anaerobic digestion process under varied agitation conditions and sludge properties. A novel approach was developed, estimating the biogas production rate based on local fluid behavior. The numerical results revealed that over-agitation can restrict anaerobic digestion efficiency, with the critical value increasing as total solid content rises. For 16.4 % total solids (TS) active sludge, the highest biogas production rate was achieved at 30 RPM in this study. In contrast, the biogas production rate of 18.7 % TS active sludge continuously increased with agitation rate, with over-agitation speeds considered to be over 80 RPM.

Keywords: Biogas production rate; Hydrodynamic characterization; High solid anaerobic digestion; CSTR; CFD (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:241:y:2025:i:c:s0960148124023942

DOI: 10.1016/j.renene.2024.122326

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