Ensiling – Wet-storage method for lignocellulosic biomass for bioethanol production

Piotr Oleskowicz-Popiel, Anne Belinda Thomsen, Jens Ejbye Schmidt

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Ensiling of humid biomass samples wrapped in plastic bales has been investigated as a wet-storage for bioethanol production from three lignocellulosic biomass samples i.e. maize, rye, and clover grass. During the silage process, lactic acid bacteria fermented free sugars to lactic acid, and consequently by lowing pH, inhibiting other microbes to degrade the polysaccharides. Following silage treatment, enzymatic convertibility tests showed that 51.5%, 36.5%, and 41.9% of the cellulose was converted by cellulytic enzymes in ensiled maize, rye, and clover grass, respectively. In addition, tests of SSF (simultaneous saccharification and fermentation) were carried out using combined enzymatic hydrolysis and fermentation with two different microorganisms Saccharomyces cerevisiae and Kluyveromyces marxianus. The ethanol production was 33.0%, 27.5%, 36.9% (by K. marxianus) and 29.0%, 28.1%, 34.5% (by S. cerevisiae); the yields significantly increased after hydrothermal pretreatment: 77.7%, 72.8%, 79.5% (by K. marxianus) and 72.0%, 80.7%, 75.7% (by S. cerevisiae) of the theoretical based on the C6 sugar contents in maize, rye, and clover grass, respectively.
    Original languageEnglish
    JournalBiomass & Bioenergy
    Volume35
    Issue number5
    Pages (from-to)2087-2092
    ISSN0961-9534
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Bio refinery

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