title: Effect of biochar addition on hydrogen and methane production in two-phase anaerobic digestion of aqueous carbohydrates food waste.
abstract: Effect of biochar addition on hydrogen and methane production in two-phase anaerobic digestion of aqueous carbohydrates was studied using bench-scale bioreactors. The cultures with biochar additions were placed in 100ml reactors and incubated at 35°C and pH 5 for hydrogen production. The residual cultures were then used for methane production, incubated at 35°C and pH 7. Daily yields of hydrogen and methane and weekly yield of volatile fatty acids (VFA) were measured. The hydrogen and methane production potentials, rate and lag phases of the two phases were analysed using the Gompertz model. The results showed that biochar addition increased the maximum production rates of hydrogen by 32.5% and methane 41.6%, improved hydrogen yield by 31.0% and methane 10.0%, and shortened the lag phases in the two phases by 36.0% and 41.0%, respectively. Biochar addition also enhanced VFA generation during hydrogen production and VFA degradation in methane production.
authors.affiliation: Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
authors.forename: Nimas M S
authors.initials: NMS
authors.lastname: Sunyoto
authors.affiliation: Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia. Electronic address: mingming.zhu@uwa.edu.au.
authors.forename: Mingming
authors.initials: M
authors.lastname: Zhu
authors.affiliation: Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
authors.forename: Zhezi
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
authors.forename: Dongke
authors.initials: D
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis / Q000187:drug effects; D000704:Analysis of Variance; D019149:Bioreactors / Q000382:microbiology; D001939:Bread; D002241:Carbohydrates / Q000737:chemistry*; D002606:Charcoal / Q000494:pharmacology*; D005232:Fatty Acids, Volatile / Q000032:analysis; D005502:Food; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000096:biosynthesis*; D012722:Sewage / Q000382:microbiology; D014866:Waste Products / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D005232:Fatty Acids, Volatile; D012722:Sewage; D014866:Waste Products; C540010:biochar; D014867:Water; D002606:Charcoal; D006859:Hydrogen; D008697:Methane
keywords: Anaerobic digestion; Biochar; Carbohydrates; Food waste; Hydrogen; Methane