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Ethanol Production from Lignocellulosic Byproducts of Olive Oil Extraction

  • Ignacio Ballesteros
  • Jose Miguel Oliva
  • Felicia Saez
  • Mercedes BallesterosEmail author
Chapter
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Part of the ABAB Symposium book series (ABAB)

Abstract

The recent implementation of a new two-step centrifugation process for extracting olive oil in Spain has substantially reduced water consumption, thereby eliminating oil mill wastewater. However, a new high sugar content residue is still generated. In this work the two fractions present in the residue (olive pulp and fragmented stones) were assayed as substrate for ethanol production by the simultaneous saccharification and fermentation (SSF) process. Pretreatment of fragmented olive stones by sulfuric acid-catalyzed steam explosion was the most effective treatment for increasing enzymatic digestibility; however, a pretreatment step was not necessary to bioconvert the olive pulp into ethanol. The olive pulp and fragmented olive stones were tested by the SSF process using a fed-batch procedure. By adding the pulp three times at 24-h intervals, 76% of the theoretical SSF yield was obtained. Experiments with fed-batch pretreated olive stones provided SSF yields significantly lower than those obtained at standard SSF procedure. The preferred SSF conditions to obtain ethanol from olives stones (61% of theoretical yield) were 10% substrate and addition of cellulases at 15 filter paper units/g of substrate.

Index Entries

Ethanol olive oil extraction byproducts pretreatment enzymatic saccharification fermentation 

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Ignacio Ballesteros
    • 1
  • Jose Miguel Oliva
    • 1
  • Felicia Saez
    • 1
  • Mercedes Ballesteros
    • 1
    Email author
  1. 1.Renewable Energies DepartmentCIEMATMadridSpain

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