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Ethanol production from olive prunings by autohydrolysis and fermentation with Candida tropicalis

Author

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  • García Martín, Juan Francisco
  • Cuevas, Manuel
  • Bravo, Vicente
  • Sánchez, Sebastián

Abstract

Hydrolysates from olive prunings (a renewable, low-cost, easily available, agricultural residue) were fermented with the unconventional yeast Candida tropicalis NBRC 0618 to produce not only ethanol fuel but also xylitol as a by-product, which adds value to the economic viability of the bioprocess. Autohydrolysis took place at 200 °C in a stirred stainless-steel tank reactor. The influence of the solid/liquid ratio in the reactor was studied. Fermentation experiments were conducted in a batch-culture reactor at a temperature of 30 °C, a stirring rate of 500 rpm and pH values of between 5.0 and 6.5. Under the operating conditions tested the highest yields of ethanol and xylitol were obtained with the hydrolysate fermented at pH 5.0 and solely the airflow that entered via the stirring vortex. Under these conditions, the instantaneous ethanol yield was 0.44 g g−1 and the overall xylitol yield 0.13 g g−1.

Suggested Citation

  • García Martín, Juan Francisco & Cuevas, Manuel & Bravo, Vicente & Sánchez, Sebastián, 2010. "Ethanol production from olive prunings by autohydrolysis and fermentation with Candida tropicalis," Renewable Energy, Elsevier, vol. 35(7), pages 1602-1608.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:7:p:1602-1608
    DOI: 10.1016/j.renene.2009.12.015
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    Cited by:

    1. Poveda-Giraldo, Jhonny Alejandro & Solarte-Toro, Juan Camilo & Cardona Alzate, Carlos Ariel, 2021. "The potential use of lignin as a platform product in biorefineries: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    2. García Martín, Juan F. & Sánchez, Sebastián & Cuevas, Manuel, 2013. "Evaluation of the effect of the dilute acid hydrolysis on sugars release from olive prunings," Renewable Energy, Elsevier, vol. 51(C), pages 382-387.
    3. Raj, Kanak & Krishnan, Chandraraj, 2020. "Improved co-production of ethanol and xylitol from low-temperature aqueous ammonia pretreated sugarcane bagasse using two-stage high solids enzymatic hydrolysis and Candida tropicalis," Renewable Energy, Elsevier, vol. 153(C), pages 392-403.
    4. Cuevas, Manuel & Sánchez, Sebastián & García, Juan F. & Baeza, Jaime & Parra, Carolina & Freer, Juanita, 2015. "Enhanced ethanol production by simultaneous saccharification and fermentation of pretreated olive stones," Renewable Energy, Elsevier, vol. 74(C), pages 839-847.
    5. Kougioumtzis, Michael Alexandros & Kanaveli, Ioanna Panagiota & Karampinis, Emmanouil & Grammelis, Panagiotis & Kakaras, Emmanuel, 2021. "Combustion of olive tree pruning pellets versus sunflower husk pellets at industrial boiler. Monitoring of emissions and combustion efficiency," Renewable Energy, Elsevier, vol. 171(C), pages 516-525.

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