RT journal article
T1 Dry Anaerobic Digestion of Brewer’s Spent Grains toward a More Sustainable Brewery: Operational Performance, Kinetic Analysis, and Bioenergy Potential
A1 Sganzerla, William Gustavo
A1 Costa, Josiel Martins
A1 Tena Villares, Miriam
A1 Buller, Luz Selene
A1 Mussatto, Solange I.
A1 Forster Carneiro, Tania
A2 Tecnologías del Medio Ambiente
K1 biogas
K1 biomethane
K1 biorefinery
K1 circular economy
K1 electricity
K1 energy
K1 greenhouse gas emissions
K1 methane
AB Industrial beer production generates brewer’s spent grains (BSG) as a primary solid waste. The disposal of industrial waste can cause negative environmental side effects, including greenhouse gas emissions. This study evaluated the dry anaerobic digestion (AD) of BSG for bioenergy recovery as a solution toward a more sustainable brewery. The laboratory-scale agitated tank batch reactor (6.8 L) was started up with BSG (25%), mesophilic inoculum (45%), and water (30%). The experimental results showed 82.12% solids biodegradation, 57.38% soluble chemical oxygen demand removal, and an accumulated methane yield of 10.53 L CH4 kg−1 TVS. The methane production efficiency was evaluated by the modified Gompertz, Cone, and first-order kinetic models. The Cone model fitted methane evolution better than the modified Gompertz and first-order kinetic models. The biogas produced from the dry AD of BSG could generate electricity (0.133 MWh ton−1) and heat (598.45 MJ ton−1), mitigating 0.0099 and 0.0335 tCO2eq ton−1 BSG, respectively, for electricity and heat. The implementation of dry AD could supply 7.38% of the electricity and 6.86% of the heat required for beer production. Finally, in a biorefinery concept, dry AD can be an alternative route for solid waste management and bioenergy recovery, contributing to reduce the environmental impact of breweries.
PB MDPI
SN 2311-5637
YR 2022
FD 2022-12-20
LK http://hdl.handle.net/10498/31598
UL http://hdl.handle.net/10498/31598
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026