Computational fluid dynamics study on mixing mode and power consumption in anaerobic mono- and co-digestion. (March 2016)

• Record Type: Journal Article
• Authors: Zhang, Yuan; Yu, Guangren; Yu, Liang; Siddhu, Muhammad Abdul Hanan; Gao, Mengjiao; Abdeltawab, Ahmed A.; Al-Deyab, Salem S.; Chen, Xiaochun
• Is Part Of: Bioresource technology. Volume 203(2016)
• Page Start: 166
• Page End: 172
• Publication Date: 2016-03
• Subjects: Computational fluid dynamics (CFD) -- Anaerobic co-digestion -- Net power production -- Cattle manure -- Corn stover; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.12.023
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: CFD models were developed for anaerobic mono-digestion and co-digestion. Continuous and intermittent mixing was compared in anaerobic co-digestion. New index of net power production was proposed to optimize feedstock ratio. Optimum feedstock ratios were determined for different mixing modes. Abstract: Computational fluid dynamics (CFD) was applied to investigate mixing mode and power consumption in anaerobic mono- and co-digestion. Cattle manure (CM) and corn stover (CS) were used as feedstock and stirred tank reactor (STR) was used as digester. Power numbers obtained by the CFD simulation were compared with those from the experimental correlation. Results showed that the standard k – ε model was more appropriate than other turbulence models. A new index, net power production instead of gas production, was proposed to optimize feedstock ratio for anaerobic co-digestion. Results showed that flow field and power consumption were significantly changed in co-digestion of CM and CS compared with those in mono-digestion of either CM or CS. For different mixing modes, the optimum feedstock ratio for co-digestion changed with net power production. The best option of CM/CS ratio for continuous mixing, intermittent mixing I, and intermittent mixing II were 1:1, 1:1 and 1:3, respectively.