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

Manuel Cuevas, Sebastián Sánchez, Juan F. García, Jaime Baeza, Carolina Parra and Juanita Freer

Renewable Energy, 2015, vol. 74, issue C, 839-847

Abstract: 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 (0.21 kg kg−1) and d-glucose (0.11 kg kg−1) were achieved in DSA assays at 200 °C and 230 °C, respectively, while LHW processes provided the maximum oligosaccharide recovery (0.17 kg kg−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 47.1 kg m−3, and 13 kg ethanol were obtained from 100 kg of raw material.

Keywords: Fuel-ethanol; Olive stones; Organosolv delignification; Pretreatment; Simultaneous saccharification and fermentation (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:74:y:2015:i:c:p:839-847

DOI: 10.1016/j.renene.2014.09.004

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