Production of biogas and fermentable sugars from spent brewery grains: Evaluation of one- and two-stage thermal pretreatment in an integrated biorefinery

Camargos, Adonai Bruneli de; Fonseca, Yasmim Arantes da; Silva, Nayara Clarisse Soares; Barreto, Elisa da Silva; Adarme, Oscar Fernando Herrera; Paranhos, Aline Gomes de Oliveira; Gurgel, Leandro Vinícius Alves; Baêta, Bruno Eduardo Lôbo

doi:10.1016/j.jece.2021.105960

Cited by 12 publications

(9 citation statements)

References 58 publications

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“…The presence of lignin has been considered a factor that largely determines the very low enzymatic hydrolysis extension of untreated lignocellulosic biomasses, as it hinders the accessibility of enzymes to cellulose [ 21 ]. On the other hand, the insoluble lignin-soluble lignin ratio is a parameter indicating the effects of heat treatment in BSG [ 9 ]. This ratio was 3.5-fold higher in the residue obtained after subcritical water treatment than in raw BSG, suggesting that the hydrothermal treatment has caused changes in the chemical structure of lignin.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the glucose yield for subW-pretreated BSG was 5.2-fold higher than for raw BSG. During the pretreatment, the removal of the hemicelluloses’ fraction favors enzymatic hydrolysis, making cellulose chains more accessible to enzymatic attack, for conversion into glucose monomers [ 8 , 9 , 10 ]. In this work, the cellulose/hemicelluloses ratio in pretreated BSG was more than 34-folder higher than in raw BSG.…”

Section: Resultsmentioning

confidence: 99%

“…The use of subcritical water (subW) as an eco-friendly method for lignocellulose pretreatment avoiding chemicals addition was proposed in recent studies [ 8 , 9 , 10 , 11 ]. SubW is pressurized water in its liquid state in the temperature range from 100 °C to 374 °C.…”

Section: Introductionmentioning

confidence: 99%

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Subcritical Water as Pretreatment Technique for Bioethanol Production from Brewer’s Spent Grain within a Biorefinery Concept

et al. 2022

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Bioeconomy and environmental issues envisage industrial by-products such as Brewer’s spent grain (BSG) as renewable resources for their recycling and reuse within a biorefinery concept. This study aimed to investigate the production of bioethanol from subcritical water (subW) pretreated BSG, following the conversion of the BSG biopolymers cellulose and hemicelluloses. The subW pretreatment was performed in a batch reactor at 174 °C, during 60 min and 5% (w/v) of dry BSG charge. The behavior of BSG biopolymers under subW pretreatment was monitored by evaluating the chemical composition of the liquid and solid streams and the chemical and structural changes caused in the solid residues by scanning electron microscope (SEM), CHNS elemental analysis and water retention value (WRV). The production of bioethanol from subW-pretreated BSG was assessed by separate hydrolysis and fermentation (SHF) and also by simultaneous saccharification and fermentation (SSF) by using the enzymatic cocktail Celluclast 1.5 L (40 FPU/gsolids) and the yeast Ethanol Red®. The higher bioethanol productivity (1.073 g∙L−1∙h−1) and concentration (32.18 g/L) were achieved by SSF with higher solids’ loading (25%) and following a fed-batch strategy. These results suggest that subcritical water pretreatment is a promising technology for the valorization of BSG as a feedstock for second-generation bioethanol production.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Subcritical Water as Pretreatment Technique for Bioethanol Production from Brewer’s Spent Grain within a Biorefinery Concept

et al. 2022

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“…High rates trigger an imbalance between the reaction rate of acidogenesis, acetogenesis, and methanogenesis stages, resulting in a faster VFA production than its consumption. Therefore, acids accumulate in the system and can cause kinetic and thermodynamic constraints, impairing methane production 12,50 . In fact, the Pareto chart of standardized effects, presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, acids accumulate in the system and can cause kinetic and thermodynamic constraints, impairing methane production. 12,50 In fact, the Pareto chart of standardized effects, presented in Fig. 1, shows that CB has the most influence on VFA production.…”

Section: Vfa Accumulationmentioning

confidence: 94%

Methane production by anaerobic co‐digestion of dairy manure and cassava wastes for energy recovery

Martins

Fonseca

Faria

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: In this study, the anaerobic co-digestion of cassava wastewater (CW), cassava bagasse (CB), and dairy manure (DM) was investigated to produce biogas with energy recovery. Mixture experimental design was performed to establish the proportion of each substrate, on the basis of total weight (%wt). The digestion was carried out under mesophilic conditions (35 °C) using a batch test. RESULTS:The best methane yields were 150.33 NmLCH 4 gVS −1 (114.46 NmLCH 4 gCOD −1 ) for the condition with 100% CW (C/N ratio = 14.04) and 130.43 normal mililiters of methane per gram of volatile solid (NmLCH 4 gVS −1 ) and 93.84 normal mililiters of methane per gram of chemical oxygen demand (NmLCH 4 gCOD −1 ) obtained with 66.7% DM, 16.7% CB and 16.7% CW (C/N ratio = 34.84). Experimental conditions containing high proportions of CB (above 33%) yielded high C/N ratios (above 52), resulting in low pH and high volatile fatty acid production, mainly acetic and butyric acids. Kinetics of methane production under optimal conditions were best described by Groot's multi-stage model.CONCLUSION: An energy balance for the best conditions were performed, leading to 452.86 MJ ton substrate −1 for a high DM content mixture experiment (DM = 66.7%, CB = 16.7%, CW = 16.7%); thereby showing that anaerobic co-digestion can replace 22.5% of the energy demanded by cassava processing industry.

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Life-cycle assessment as a prospection stage for the biochemical methane potential of pretreated lignocellulosic biomass

Fernandes

Baêta

Damgaard

2023

Bioresource Technology

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Production of biogas and fermentable sugars from spent brewery grains: Evaluation of one- and two-stage thermal pretreatment in an integrated biorefinery

Cited by 12 publications

References 58 publications

Subcritical Water as Pretreatment Technique for Bioethanol Production from Brewer’s Spent Grain within a Biorefinery Concept

Subcritical Water as Pretreatment Technique for Bioethanol Production from Brewer’s Spent Grain within a Biorefinery Concept

Methane production by anaerobic co‐digestion of dairy manure and cassava wastes for energy recovery

Life-cycle assessment as a prospection stage for the biochemical methane potential of pretreated lignocellulosic biomass

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