Production of biogas and fermentable sugars from spent brewery grains : evaluation of one- and two-stage thermal pretreatment in an integrated biorefinery.
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Date
2021
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Abstract
In this study, the production of fermentable sugars and biogas from thermally pretreated brewer’s spent grains
(BSGs) was investigated. There were two autohydrolysis conditions (C1-1S: 180 oC, 30 min, 5 mLH2O gBSG
− 1 and C2-
1S: 180 oC, 60 min, 5 mLH2O gBSG
− 1 ) which were evaluated, with and without a previous low severity pretreatment
(80 oC, 10 min, 10 mLH2O gBSG
− 1 ). The highest specific methane production (302.4 NLCH4 kgCOD
− 1 ) and enzymatic
hydrolysis yield (EHY of 98%, 50 FPU gBSG
− 1 ) were obtained from the two-stage pretreatment, with the second
stage operated at 180 ◦C for 60 min, 5 mLH2O gBSG
− 1 . However, in the integrated process, the two-stage pre-
treatment with the second stage performed at 180 ◦C for 30 min, and 5 mLH2O gBSG
− 1 was the best condition to
produce fermentable sugars from enzymatic hydrolysis of pretreated BSGs, using a lower enzyme loading (EHY of
93%, 25 FPU gBSG
− 1 ). The burning of biogas produced from an anaerobic digestion of liquid fractions (hydroly-
sates) generated after two-stage thermal pretreatment in a combined heat and power system can produce a net
thermal energy of 1.71 MJ kgBSG dry basis − 1 and electrical energy of 0.392 kW h kgBSG dry basis − 1 .
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Keywords
Anaerobic digestion, Enzymatic hydrolysis, Lignocellullosic biomass
Citation
CAMARGOS, A. B. de et al. Production of biogas and fermentable sugars from spent brewery grains: evaluation of one- and two-stage thermal pretreatment in an integrated biorefinery. Journal of Environmental Chemical Engineering, v. 9, artigo 105960, 2021. Disponível em: <https://www.sciencedirect.com/science/article/pii/S2213343721009374>. Acesso em: 11 out. 2022.