Enhanced ethanol production by simultaneous saccharification and fermentation of pretreated olive stones

  • Cuevas M
  • Sánchez S
  • García J
 et al. 
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Olive stones are an agro-industrial by-product in Mediterranean countries that can be regarded as a potential source of bio-fuels and bioactive compounds. In this work, olive stones were pretreated with liquid hot water (LHW), dilute sulphuric acid (DSA) and organosolv delignification at temperatures in the range 190°C-230°C. The resulting solids from pretreatments were subjected to simultaneous saccharification and fermentation (SSF) with the yeast Saccharomyces cerevisiae IR2-9a for fuel-ethanol production. The composition of prehydrolysates from LHW and DSA pretreatments were strongly dependent of reactor temperature. The highest yields of d-xylose (0.21kgkg-1) and d-glucose (0.11kgkg-1) were achieved in DSA assays at 200°C and 230°C, respectively, while LHW processes provided the maximum oligosaccharide recovery (0.17kgkg-1) at 210°C. The addition of sulphuric acid in organosolv pretreatments was particularly effective to increase the cellulose content of the pretreated solids till percentages close to 83%. Finally, the maximum ethanol concentration achieved by SSF was 47.1kgm-3, and 13kg ethanol were obtained from 100kg of raw material.

Author-supplied keywords

  • Fuel-ethanol
  • Olive stones
  • Organosolv delignification
  • Pretreatment
  • Simultaneous saccharification and fermentation

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