RT info:eu-repo/semantics/article
T1 Brewery spent grain valorization through fermentation: Targeting biohydrogen, carboxylic acids and methane production
A1 Pérez Barragán, Jacobo
A1 Martínez Fraile, Cristina
A1 Muñoz Torre, Raúl
A1 Quijano Govantes, Guillermo
A1 Maya Yescas, Rafael
A1 León Becerril, Elizabeth
A1 Castro Muñoz, Roberto
A1 García Depraect, Octavio
K1 Acidogenic fermentation
K1 Biogas
K1 Dark fermentation
K1 Organic acids
K1 Lignocellulosic waste
K1 3322.05 Fuentes no Convencionales de Energía
AB This study investigated three different fermentation approaches to explore the potential for producing biohydrogen, carboxylic acids, and methane from hydrolysates of thermally dilute acid pretreated brewer's spent grains (BSG). Initially, the research focused on maximizing the volumetric hydrogen production rate (HPR) in the continuous dark fermentation (DF) of BSG hydrolysates by varying the hydraulic retention time (HRT). The highest HPR reported to date of 5.9 NL/L-d was achieved at 6 h HRT, with a Clostridium-dominated microbial community. The effect of the operational pH (4, 5, 6, and 7) on the continuous acidogenic fermentation was then investigated. A peak carboxylic acid concentration of 17.3 g CODequiv./L was recorded at pH 6, with an associated volumetric productivity of 900.5 ± 13.1 mg CODequiv./L-h and a degree of acidification of 68.3 %. Lactic acid bacteria such as Limosilactobacillus and Lactobacillus were dominant at pH 4–5, while Weissella, Enterococcus, and Lachnoclostridium appeared at pH 6 and 7. Finally, this study evaluated the biochemical methane potential of the DF broth and the unfermented hydrolysates and found high methane yields of 659 and 517 NmL CH4/g-VSadded, respectively, both within one week. Overall, the results showed that pretreated BSG can be a low-cost feedstock for the production of bioenergy and valuable bio-based chemicals in a circular economy.
PB Elsevier
SN 0957-5820
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/73299
UL https://uvadoc.uva.es/handle/10324/73299
LA eng
NO Process Safety and Environmental Protection, noviembre 2024, vol. 191(A), p. 206-217
NO Producción Científica
DS UVaDOC
RD 08-abr-2025