Composition-oriented estimation of biogas production from major culinary wastes in an anaerobic bioreactor and its associated CO2 reduction potential
Journal
Bioresource Technology
Journal Volume
318
Date Issued
2020
Author(s)
Abstract
Despite the wide applications of dry anaerobic digestion (AD), a number of fundamental issues, such as composition-oriented estimation of biogas production and CO2 reduction potential, were not well understood yet. The objective of this study was to establish composition-oriented models for prediction of biogas production and the associated shift of microbial communities. Three important factors regarding feedstock, including loading, carbon-to-nitrogen ratio, and solid-to-liquid ratio, were found to significantly affect the biogas production. The biogas production and digestion kinetics were evaluated with the response surface methodology. The major contribution to biogas production was found to be hydrogenotrophic methanogens (82.6 ± 0.4%). The net CO2 reduction potential was assessed from the life-cycle approach, and a substantial amount of CO2 generation (i.e., 2.8–6.7 tonne/tonne-VS) could be reduced by AD, compared to incineration, revealing that dry AD for food waste treatment should be one of the essential practices in the portfolio of global CO2 mitigation. © 2020 Elsevier Ltd
Subjects
Dry digestion; Life cycle assessment; Microbial analysis; Modified Gompertz model; Response surface methodology
Other Subjects
Biogas; Carbon dioxide; Food waste; Life cycle; Waste incineration; Anaerobic bioreactors; Carbon-to-nitrogen ratio; Dry anaerobic digestions; Hydrogenotrophic methanogens; Life cycle approach; Microbial communities; Response surface methodology; Solid-to-liquid ratio; Anaerobic digestion; biogas; carbon; carbon dioxide; nitrogen; biofuel; carbon dioxide; methane; anaerobic digestion; carbon dioxide; estimation method; food waste; microbial community; reaction kinetics; reduction; waste treatment; anaerobic capacity; anaerobic digestion; Article; comparative study; evaluation study; incineration; kinetics; microbial community; nonhuman; oxidation reduction potential; predictive value; priority journal; waste management; anaerobic growth; bioreactor; food; waste disposal; Anaerobiosis; Biofuels; Bioreactors; Carbon Dioxide; Food; Methane; Refuse Disposal
Type
journal article