Abstract
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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Acknowledgments
This work was co-supported by the INCITE Program (Xunta de Galicia, PGIDIT07REM011E), by the CDTI (Project CEN-200910140) and by the Ministry of Economy and Competitiveness of Spain through the Local Investment Fund for Employment (Government of Spain) and was carried out in collaboration with Abengoa Bionergía Nuevas Tecnologías. The authors also thank CDTI (CENIT I + DEA Program) for additional support and Novozymes for providing commercial enzymes. T. Lu-Chau wishes to thank the I. Barreto program from the Galicia Government for economic support and D. Salvachúa thanks an FPU fellowship from the MICINN.
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López-Abelairas, M., Álvarez Pallín, M., Salvachúa, D. et al. Optimisation of the biological pretreatment of wheat straw with white-rot fungi for ethanol production. Bioprocess Biosyst Eng 36, 1251–1260 (2013). https://doi.org/10.1007/s00449-012-0869-z
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DOI: https://doi.org/10.1007/s00449-012-0869-z