Conversion of apple pomace waste to ethanol at industrial relevant conditions

Margaret Magyar, Leonardo da Costa Sousa, Mingjie Jin, Cory Sarks, Venkatesh Balan

    Research output: Research - peer-reviewArticle

    • 1 Citations

    Abstract

    Apple pomace samples were evaluated for conversion to ethanol at industrial relevant conditions. Biomass degradation efficiency by commercial enzymes was evaluated at 20 % solid loading for dilute sulfuric acid, calcium oxide, and autoclave without any chemical (control) apple pomace samples. The control and calcium oxide-pretreated pomace provided similar sugar yields, while dilute sulfuric acid pretreatment resulted in reduced sugar yields. The control and calcium oxide-pretreated pomace hydrolysate were fermented to ethanol using a native Saccharomyces cerevisiae yeast strain, producing 38.8 and 36.9 g/L of ethanol, respectively. When control apple pomace sample loading was increased from 20 to 30 %, 57.5 and 50.1 g/L of glucose and fructose was produced, respectively. Lastly, we found that unhydrolyzed solids (UHS) present during fermentation had little effect on ethanol yield, as 53.6 and 53.8 g/L of ethanol were produced with and without UHS, respectively. Overall, ethanol yields were 134 g per kg of dry apple pomace. A complete process mass balance for enzyme hydrolysis and ethanol fermentation is provided in this manuscript. These results show that apple pomace is an excellent feedstock for producing ethanol that could be either used as biofuel or as beverage.

    LanguageEnglish (US)
    Pages1-10
    Number of pages10
    JournalApplied Microbiology and Biotechnology
    DOIs
    StateAccepted/In press - Jun 30 2016

    Profile

    Malus
    Ethanol
    lime
    Fermentation
    Enzymes
    sulfuric acid
    Biofuels
    Beverages
    Fructose
    Biomass
    Saccharomyces cerevisiae
    Hydrolysis
    Yeasts
    Glucose

    Keywords

    • Apple pomace
    • Enzymatic hydrolysis
    • Ethanol
    • Microbial fermentation
    • Pretreatment

    ASJC Scopus subject areas

    • Biotechnology
    • Applied Microbiology and Biotechnology

    Cite this

    Conversion of apple pomace waste to ethanol at industrial relevant conditions. / Magyar, Margaret; da Costa Sousa, Leonardo; Jin, Mingjie; Sarks, Cory; Balan, Venkatesh.

    In: Applied Microbiology and Biotechnology, 30.06.2016, p. 1-10.

    Research output: Research - peer-reviewArticle

    Magyar, Margaret ; da Costa Sousa, Leonardo ; Jin, Mingjie ; Sarks, Cory ; Balan, Venkatesh. / Conversion of apple pomace waste to ethanol at industrial relevant conditions. In: Applied Microbiology and Biotechnology. 2016 ; pp. 1-10
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