Fuel ethanol production from steam-pretreated corn stover using SSF at higher dry matter content

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Abstract

Replacing fossil fuels by bio-fuels has many advantages, such as the reduction of CO2-emission to the atmosphere, the possibility for non-oil-producing countries to be self-sufficient in fuel, and increased local job opportunities. Bio-ethanol is such a promising renewable fuel. However, today it is produced from sugar or starch-raw materials that are relatively expensive. To lower the production cost of bio-ethanol the cost of the raw material must be reduced and the production process made more efficient. The production of bio-ethanol from corn stover using simultaneous saccharification and fermentation (SSF) at high dry matter content addresses both issues. Corn stover is an agricultural by-product and thus has a low economic value. SSF at high dry matter content results in a high ethanol concentration in the fermented slurry, thereby decreasing the energy demand in the subsequent distillation step. In this study, SSF was performed on steam-pretreated corn stover at 5, 7.5 and 10% water-insoluble solids (WIS) with 2g/L hexosefermenting Saccharomyces cerevisiae (ordinary compressed baker's yeast). SSF at 10% WIS resulted in an ethanol yield of 74% based on the glucose content in the raw material and an ethanol concentration of 25 g/L. Neither higher yeast concentration (5 g/L) nor yeast cultivated on the liquid after the pretreatment resulted, under these conditions, in a higher overall ethanol yield. (c) 2006 Elsevier Ltd. All rights reserved.

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Subject classification (UKÄ) – MANDATORY

  • Chemical Engineering

Keywords

  • ethanol, concentration, corn stover, SO2, ethanol production, steam pretreatment, SSF
Original languageEnglish
Pages (from-to)863-869
JournalBIOMASS & BIOENERGY
Volume30
Issue number10
Publication statusPublished - 2006
Publication categoryResearch
Peer-reviewedYes