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Brewer’s spent grain as a source of renewable fuel through optimized dilute acid pretreatment

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  • Rojas-Chamorro, José A.
  • Romero, Inmaculada
  • López-Linares, Juan C.
  • Castro, Eulogio

Abstract

In this work, a dilute sulfuric acid pretreatment at mild conditions was employed to fractionate brewer’s spent grain (BSG) with the aim of achieving high carbohydrate recovery. A Box-Behnken experimental design was used with temperature (110–130 °C), acid concentration (1–3% w/v) and time (10–40 min) as independent factors, the objective being to determine the best conditions for the release of glucose (following enzymatic hydrolysis of the pretreated solids) along with that of hemicellulosic sugars in the liquors. The optimal pretreatment conditions were found to be 130 °C, 1% H2SO4 and 26 min, which allowed the recovery of 94% of the sugars in raw BSG. Next, the effect of substrate concentration on the simultaneous saccharification and fermentation (SSF) process of the pretreated solid was studied. Likewise, the fermentability of the resulting prehydrolysate was evaluated with two xylose fermenting microorganisms, Scheffersomyces stipitis and Escherichia coli. The overall proposed BSG bioconversion process yielded 22.9 L bioethanol from 100 kg of dry biomass.

Suggested Citation

  • Rojas-Chamorro, José A. & Romero, Inmaculada & López-Linares, Juan C. & Castro, Eulogio, 2020. "Brewer’s spent grain as a source of renewable fuel through optimized dilute acid pretreatment," Renewable Energy, Elsevier, vol. 148(C), pages 81-90.
    • Handle: RePEc:eee:renene:v:148:y:2020:i:c:p:81-90
    DOI: 10.1016/j.renene.2019.12.030
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    References listed on IDEAS

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    1. Mussatto, Solange I. & Machado, Ercília M.S. & Carneiro, Lívia M. & Teixeira, José A., 2012. "Sugars metabolism and ethanol production by different yeast strains from coffee industry wastes hydrolysates," Applied Energy, Elsevier, vol. 92(C), pages 763-768.
    2. Dussán, Kelly J. & Silva, Débora D.V. & Perez, Victor H. & da Silva, Silvio S., 2016. "Evaluation of oxygen availability on ethanol production from sugarcane bagasse hydrolysate in a batch bioreactor using two strains of xylose-fermenting yeast," Renewable Energy, Elsevier, vol. 87(P1), pages 703-710.
    3. Singh, Renu & Shukla, Ashish & Tiwari, Sapna & Srivastava, Monika, 2014. "A review on delignification of lignocellulosic biomass for enhancement of ethanol production potential," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 713-728.
    4. Duque, Aleta & Manzanares, Paloma & Ballesteros, Mercedes, 2017. "Extrusion as a pretreatment for lignocellulosic biomass: Fundamentals and applications," Renewable Energy, Elsevier, vol. 114(PB), pages 1427-1441.
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    1. López-Linares, Juan C. & Coca, Mónica & Plaza, Pedro E. & Lucas, Susana & García-Cubero, María Teresa, 2023. "Waste-to-fuel technologies for the bioconversion of carrot discards into biobutanol," Renewable Energy, Elsevier, vol. 202(C), pages 362-369.
    2. Chen, Mingjie & Lin, Yang & Xu, Tianle & Yan, Xiaoran & Jiang, Hao & Leng, Lijian & Zeng, Zhiyong & Wang, Xinming & Zhan, Hao, 2025. "Valorization of alcohol industry residues into solid, gaseous and liquid biofuels: A comprehensive review," Renewable Energy, Elsevier, vol. 238(C).
    3. Tomasz Kalak, 2025. "Characterization and Sustainable Valorization of Brewers’ Spent Grain for Metal Ion and Organic Substance Removal," Sustainability, MDPI, vol. 17(20), pages 1-37, October.
    4. Wagner, Evelyn & Sierra-Ibarra, Estefanía & Rojas, Natalia L. & Martinez, Alfredo, 2022. "One-pot bioethanol production from brewery spent grain using the ethanologenic Escherichia coli MS04," Renewable Energy, Elsevier, vol. 189(C), pages 717-725.
    5. Davide Assandri & Niccolò Pampuro & Giacomo Zara & Eugenio Cavallo & Marilena Budroni, 2020. "Suitability of Composting Process for the Disposal and Valorization of Brewer’s Spent Grain," Agriculture, MDPI, vol. 11(1), pages 1-12, December.

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