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Use of White-Rot Fungi for Valorization of Stillage From Bioethanol Production

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Abstract

Stillage valorization is a key aspect of cereal-based bioethanol production due to its significant economic value to first-generation biorefineries. In this study, white-rot fungi (wrf) were used to increase the nutritional characteristics of stillage from distiller’s dried grains with solubles (DDGS), a by-product of the bioethanol industry. A ligninolytic fungus was selected from a screen of nine wrf strains, resulting in a 32 % increase in the protein content after secondary fermentation. Additionally, an important ligninolytic enzyme was produced from this treatment. A study of operational conditions, including the percentage of stillage in the culture medium, type of fermentation (agitated or static culture), and the scale-up from Erlenmeyer flasks to a 4 L bioreactor, was also conducted.

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Acknowledgments

This study was supported by Research Project (PGIDIT04REM019E) from the Galician Government and was carried out in collaboration with Abengoa Bioenergy (Bioetanol Galicia S.A). We also want to acknowledge María J. Martinez from the CIB (Madrid), Antonio Gonzalez Rodríguez from the CIAM (Mabegondo, A Coruña) and the laboratory personnel from Bioetanol Galicia for analytical support provided during the development of this work. T. Lu-Chau wishes to thank the Isabel Barreto program from the Galician Government for economic support.

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Authors and Affiliations

  1. Department of Chemical Engineering, Institute of Technology (IIT), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain

    Rocío Pena & Thelmo A. Lú-Chau

  2. Department of Chemical Engineering, School of Engineering (ETSE), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain

    Juan M. Lema

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  1. Rocío Pena
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  2. Thelmo A. Lú-Chau
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  3. Juan M. Lema
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Correspondence to Thelmo A. Lú-Chau.

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Pena, R., Lú-Chau, T.A. & Lema, J.M. Use of White-Rot Fungi for Valorization of Stillage From Bioethanol Production. Waste Biomass Valor 3, 295–303 (2012). https://doi.org/10.1007/s12649-012-9130-x

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  • DOI: https://doi.org/10.1007/s12649-012-9130-x

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