title: Computational fluid dynamics study on mixing mode and power consumption in anaerobic mono- and co-digestion.
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.
authors.affiliation: Beijing Key Laboratory of Membrane Science and Technology & College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Beijing Key Laboratory of Membrane Science and Technology & College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Guangren
authors.initials: G
authors.lastname: Yu
authors.affiliation: Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Yu
authors.affiliation: Biomass Energy and Environmental Engineering Research Center, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Muhammad Abdul Hanan
authors.initials: MA
authors.lastname: Siddhu
authors.affiliation: Beijing Key Laboratory of Membrane Science and Technology & College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Mengjiao
authors.initials: M
authors.lastname: Gao
authors.affiliation: Petrochemicals Research Chair, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Abdeltawab
authors.affiliation: Petrochemicals Research Chair, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Salem S
authors.initials: SS
authors.lastname: Al-Deyab
authors.affiliation: Beijing Key Laboratory of Membrane Science and Technology & College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China. Electronic address: chenxc@mail.buct.edu.cn.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Chen
mesh_terms: D000693:Anaerobiosis / Q000502:physiology*; D000818:Animals; D019149:Bioreactors; D002417:Cattle; D003198:Computer Simulation; D004063:Digestion / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology; D057446:Hydrodynamics; D008372:Manure; D008962:Models, Theoretical; D003313:Zea mays / Q000737:chemistry
chemical_list: D008372:Manure
keywords: Anaerobic co-digestion; Cattle manure; Computational fluid dynamics (CFD); Corn stover; Net power production