Optimisation of the biological pretreatment of wheat straw with white-rot fungi for ethanol production

Optimisation of the biological pretreatment of wheat straw with white-rot fungi for ethanol production

The biological pretreatment of lignocellulosic biomass for the production of bioethanol is an environmentally friendly alternative to the most frequently used process, steam explosion (SE). However, this pretreatment can still not be industrially implemented due to long incubation times. The main ob...

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Bibliographic Details
Published in:Bioprocess and biosystems engineering Vol. 36; no. 9; pp. 1251 - 1260
Main Authors: López-Abelairas, M., Álvarez Pallín, M., Salvachúa, D., Lú-Chau, T., Martínez, M. J., Lema, J. M.
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-09-2013
Springer Nature B.V
Subjects:
Biodiesel fuels
Biofuels
Biomass
Biotechnology
Cellulose
Chemistry
Chemistry and Materials Science
Environmental Engineering/Biotechnology
Enzyme kinetics
Ethanol
Ethanol - metabolism
Fermentation
Food Science
Fungi
Glucose - metabolism
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Irpex lacteus
Lignin - chemistry
Lignin - metabolism
Lignocellulose
Original Paper
Pleurotus - growth & development
Pleurotus eryngii
Triticum - chemistry
Triticum aestivum
Wheat straw
Lignocellulosic biomass pretreatment
Bioethanol
Enzymatic hydrolysis
Ligninolytic fungus
Wheat straw
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Summary:The biological pretreatment of lignocellulosic biomass for the production of bioethanol is an environmentally friendly alternative to the most frequently used process, steam explosion (SE). However, this pretreatment can still not be industrially implemented due to long incubation times. The main objective of this work was to test the viability of and optimise the biological pretreatment of lignocellulosic biomass, which uses ligninolytic fungi ( Pleurotus eryngii and Irpex lacteus ) in a solid-state fermentation of sterilised wheat straw complemented with a mild alkali treatment. In this study, the most important parameters of the mechanical and thermal substrate conditioning processes and the most important parameters of the fungal fermentation process were optimised to improve sugar recovery. The largest digestibilities were achieved with fermentation with I. lacteus under optimised conditions, under which cellulose and hemicellulose digestibility increased after 21 days of pretreatment from 16 to 100 % and 12 to 87 %, respectively. The maximum glucose yield (84 %) of cellulose available in raw material was obtained after only 14 days of pretreatment with an overall ethanol yield of 74 % of the theoretical value, which is similar to that reached with SE.
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ISSN:1615-7591
1615-7605
DOI:10.1007/s00449-012-0869-z