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Energies 2015, 8(4), 2575-2586; doi:10.3390/en8042575

Second Generation Ethanol Production from Brewers’ Spent Grain

1
Department of Chemical Sciences, University of Naples "Federico II", Complesso Universitario Monte S. Angelo, via Cintia, 480126 Naples, Italy
2
Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Coronel Francisco H. dos Santos Avenue, 210, 81531-980 Curitiba, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Dimitris Argyropoulos
Received: 27 November 2014 / Revised: 12 March 2015 / Accepted: 16 March 2015 / Published: 31 March 2015
(This article belongs to the Special Issue Advances and Challenges in Cellulosic Ethanol)
View Full-Text   |   Download PDF [258 KB, uploaded 31 March 2015]   |  

Abstract

Ethanol production from lignocellulosic biomasses raises a global interest because it represents a good alternative to petroleum-derived energies and reduces the food versus fuel conflict generated by first generation ethanol. In this study, alkaline-acid pretreated brewers’ spent grain (BSG) was evaluated for ethanol production after enzymatic hydrolysis with commercial enzymes. The obtained hydrolysate containing a glucose concentration of 75 g/L was adopted, after dilution up to 50 g/L, for fermentation by the strain Saccharomyces cerevisiae NRRL YB 2293 selected as the best producer among five ethanologenic microorganims. When the hydrolysate was supplemented with yeast extract, 12.79 g/L of ethanol, corresponding to 0.28 g of ethanol per grams of glucose consumed (55% efficiency), was obtained within 24 h, while in the non-supplemented hydrolysate, a similar concentration was reached within 48 h. The volumetric productivity increased from 0.25 g/L·h in the un-supplemented hydrolysate to 0.53 g/L h in the yeast extract supplemented hydrolysate. In conclusion, the strain S. cerevisiae NRRL YB 2293 was shown able to produce ethanol from BSG. Although an equal amount of ethanol was reached in both BSG hydrolysate media, the nitrogen source supplementation reduced the ethanol fermentation time and promoted glucose uptake and cell growth. View Full-Text
Keywords: brewers’ spent grain; lignocellulosic conversion; second generation bioethanol; enzymatic saccharification; ethanologenic microorganisms brewers’ spent grain; lignocellulosic conversion; second generation bioethanol; enzymatic saccharification; ethanologenic microorganisms
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liguori, R.; Soccol, C.R.; Porto de Souza Vandenberghe, L.; Woiciechowski, A.L.; Faraco, V. Second Generation Ethanol Production from Brewers’ Spent Grain. Energies 2015, 8, 2575-2586.

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