Preliminary results on optimization of pilot scale pretreatment of wheat straw used in coproduction of bioethanol and electricity

M.H. Thomsen, A. Thygesen, B.H. Christensen, J. Larsen, H. Jørgensen, A.B. Thomsen

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The overall objective in this European Union-project is to develop cost and energy effective production systems for coproduction of bioethanol and electricity based on integrated biomass utilization. A pilot plan reactor for hydrothermal pretreatment (including weak acid hydrolysis, wet oxidation, and steam pretreatment) with a capacity of 100 kg/h was constructed and tested for pretreatment of wheat straw for ethanol production. Highest hemicellulose (C5 sugar) recovery and extraction of hemicellulose sugars was obtained at 190 degrees C whereas highest C6 sugar yield was obtained at 200 degrees C. Lowest toxicity of hydrolysates was observed at 190 degrees C; however, addition of H2O2 improved the fermentability and sugar recoveries at the higher temperatures. The estimated total ethanol production was 223 kg/t straw assuming utilisation of both C6 and C5 during fermentation, and 0.5 g ethanol/g sugar.
    Original languageEnglish
    JournalApplied Biochemistry and Biotechnology
    Volume130
    Issue number1-3
    Pages (from-to)448-460
    ISSN0273-2289
    DOIs
    Publication statusPublished - 2006

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