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Bioresour Technol. 2014 Aug;166:403-10. doi: 10.1016/j.biortech.2014.05.025. Epub 2014 May 21.

Steam explosion pretreatment for enhancing biogas production of late harvested hay.

Author information

  • 1University of Natural Resources and Life Sciences, Department of Sustainable Agricultural Systems, Institute of Agricultural Engineering, Konrad-Lorenz-Strasse 24, A-3430 Tulln, Austria; AlpS-GmbH, Centre for Climate Change Adaptation Technologies, Grabenweg 68, A-6010 Innsbruck, Austria. Electronic address: alexander.bauer@boku.ac.at.
  • 2University of Natural Resources and Life Sciences, Department of Sustainable Agricultural Systems, Institute of Agricultural Engineering, Konrad-Lorenz-Strasse 24, A-3430 Tulln, Austria; AlpS-GmbH, Centre for Climate Change Adaptation Technologies, Grabenweg 68, A-6010 Innsbruck, Austria.
  • 3University of Natural Resources and Life Sciences, Department of Sustainable Agricultural Systems, Institute of Agricultural Engineering, Konrad-Lorenz-Strasse 24, A-3430 Tulln, Austria.
  • 4Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432 Ås, Norway.
  • 5AlpS-GmbH, Centre for Climate Change Adaptation Technologies, Grabenweg 68, A-6010 Innsbruck, Austria; Mechanics Section, Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino, largo Paolo Braccini 2, 10095 Grugliasco, Torino, Italy.
  • 6AlpS-GmbH, Centre for Climate Change Adaptation Technologies, Grabenweg 68, A-6010 Innsbruck, Austria.
  • 7Cambi AS, Skysstasjon 11A, 1383 Asker, Norway.
  • 8University of Natural Resources and Life Sciences, Department of Chemistry, Institute of Chemistry of Renewable Resources, Konrad-Lorenz-Strasse 24, A-3430 Tulln, Austria.

Abstract

Grasslands are often abandoned due to lack of profitability. Extensively cultivating grassland for utilization in a biogas-based biorefinery concept could mend this problem. Efficient bioconversion of this lignocellulosic biomass requires a pretreatment step. In this study the effect of different steam explosion conditions on hay digestibility have been investigated. Increasing severity in the pretreatment induced degradation of the hemicellulose, which at the same time led to the production of inhibitors and formation of pseudo-lignin. Enzymatic hydrolysis showed that the maximum glucose yields were obtained under pretreatment at 220 °C for 15 min, while higher xylose yields were obtained at 175 °C for 10 min. Pretreatment of hay by steam explosion enhanced 15.9% the methane yield in comparison to the untreated hay. Results indicate that hay can be effectively converted to methane after steam explosion pretreatment.

Copyright © 2014 Elsevier Ltd. All rights reserved.

KEYWORDS:

Biofuel; Biogas; Hay; Methane; Steam explosion

PMID:
24929812
[PubMed - indexed for MEDLINE]
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