Comparison of energy potentials from combined ethanol and methane production using steam-pretreated corn stover impregnated with acetic acid

Pia-Maria Bondesson, Mats Galbe, Guido Zacchi

Research output: Contribution to journalArticlepeer-review

23 Citations (SciVal)

Abstract

Acetic acid was investigated as a catalyst in steam pretreatment of corn stover. The purpose was to study ethanol production using either baker's yeast or a genetically modified pentose-fermenting version of Saccharomyces cerevisiae, KE6-12. Biogas production was investigated as an alternative for utilization of xylose. The high levels of acetic acid was found to be toxic using KE6-12. Some pentose fermentation was achieved, but the ethanol end concentration was almost the same as using baker's yeast (28 g L1 compared to 27 g L1). Using xylose for biogas production resulted in a high total energy recovery. The highest total energy recovery in the products, i.e. ethanol, methane and solids, obtained was 88% compared with the energy in ingoing raw material. This result was achieved when the solids and the liquid was separated after pretreatment.
Original languageEnglish
Pages (from-to)413-424
JournalBiomass & Bioenergy
Volume67
DOIs
Publication statusPublished - 2014

Subject classification (UKÄ)

  • Chemical Engineering

Keywords

  • Acetic acid
  • Ethanol
  • Methane
  • Steam pretreatment
  • Zea mays
  • Simultaneous saccharification and co-fermentation (SSCF)

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