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: Contribution to journalArticle

  • 3 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
Fermentation
Biofuels
Beverages
Enzymes
Fructose
Biomass
Saccharomyces cerevisiae
Hydrolysis
Yeasts
Glucose
lime

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: Contribution to journalArticle

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