Pretreatment of wheat straw using combined wet oxidation and alkaline hydrolysis resulting in convertible cellulose and hemicellulose

A.B. Bjerre, A. Bjerring Olesen, T. Fernqvist, A. Plöger, A.S. Schmidt

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The wet oxidation process of wheat straw has been studied as a pretreatment method to attain our main goal: To break down cellulose to glucose enzymatic, and secondly, to dissolve hemicellulose (e.g., for fermentation) without producing microbial inhibitors. Wet oxidation combined with base addition readily oxidizes lignin from wheat straw facilitating the polysaccharides for enzymatic hy drolysis. By using a specially constructed autoclave system, the wet oxidation process was optimized with respect to both reaction time and temperature. The best conditions (20 g/L straw, 170 degrees C, 5 to 10 min) gave about 85% w/w yield of converting cellulose to glucose. The process water, containing dissolved hemicellulose and carboxylic acids, has proven to be a direct nutrient source for the fungus Aspergillus niger producing exo-beta-xylosidase. Furfural and hydroxymethyl-furfural, known inhibitors of microbial growth when other pretreatment systems have been applied, were not observed following the wet oxidation treatment. (C) 1996 John Wiley & Sons, Inc.
    Original languageEnglish
    JournalBiotechnology and Bioengineering
    Volume49
    Issue number5
    Pages (from-to)568-577
    ISSN0006-3592
    DOIs
    Publication statusPublished - 1996

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