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Biorefinery of the Olive Tree—Production of Sugars from Enzymatic Hydrolysis of Olive Stone Pretreated by Alkaline Extrusion

Author

Listed:
  • Pablo Doménech

    (Biofuels Unit, Energy Department—CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
    Equal contributors.)

  • Aleta Duque

    (Biofuels Unit, Energy Department—CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
    Equal contributors.)

  • Isabel Higueras

    (Biofuels Unit, Energy Department—CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain)

  • Raquel Iglesias

    (Biofuels Unit, Energy Department—CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain)

  • Paloma Manzanares

    (Biofuels Unit, Energy Department—CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain)

Abstract

This work addresses for the first time the study of olive stone (OS) biomass pretreatment by reactive extrusion technology using NaOH as the chemical agent. It is considered as a first step in the biological conversion process of the carbohydrates contained in the material into bio-based products. OS is a sub-product of the olive oil extraction process that could be used in a context of a multi-feedstock and multi-product biorefinery encompassing all residues generated around the olive oil production sector. OS biomass is pretreated in a twin-screw extruder at varying temperatures—100, 125 and 150 °C and NaOH/biomass ratios of 5% and 15% (dry weight basis), in order to estimate the effectiveness of the process to favour the release of sugars by enzymatic hydrolysis. The results show that alkaline extrusion is effective in increasing the sugar release from OS biomass compared to the raw material, being necessary to apply conditions of 15% NaOH/biomass ratio and 125 °C to attain the best carbohydrate conversion rates of 55.5% for cellulose and 57.7% for xylan in relation to the maximum theoretical achievable. Under these optimal conditions, 31.57 g of total sugars are obtained from 100 g of raw OS.

Suggested Citation

  • Pablo Doménech & Aleta Duque & Isabel Higueras & Raquel Iglesias & Paloma Manzanares, 2020. "Biorefinery of the Olive Tree—Production of Sugars from Enzymatic Hydrolysis of Olive Stone Pretreated by Alkaline Extrusion," Energies, MDPI, vol. 13(17), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4517-:d:407063
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    References listed on IDEAS

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    1. Aleta Duque & Paloma Manzanares & Alberto González & Mercedes Ballesteros, 2018. "Study of the Application of Alkaline Extrusion to the Pretreatment of Eucalyptus Biomass as First Step in a Bioethanol Production Process," Energies, MDPI, vol. 11(11), pages 1-15, October.
    2. Manzanares, P. & Ballesteros, I. & Negro, M.J. & González, A. & Oliva, J.M. & Ballesteros, M., 2020. "Processing of extracted olive oil pomace residue by hydrothermal or dilute acid pretreatment and enzymatic hydrolysis in a biorefinery context," Renewable Energy, Elsevier, vol. 145(C), pages 1235-1245.
    3. 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.
    4. Julio Berbel & Alejandro Posadillo, 2018. "Review and Analysis of Alternatives for the Valorisation of Agro-Industrial Olive Oil By-Products," Sustainability, MDPI, vol. 10(1), pages 1-9, January.
    5. Duque, Aleta & Manzanares, Paloma & Ballesteros, Mercedes, 2017. "Extrusion as a pretreatment for lignocellulosic biomass: Fundamentals and applications," Renewable Energy, Elsevier, vol. 114(PB), pages 1427-1441.
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    Cited by:

    1. Delon Konan & Ekoun Koffi & Adama Ndao & Eric Charles Peterson & Denis Rodrigue & Kokou Adjallé, 2022. "An Overview of Extrusion as a Pretreatment Method of Lignocellulosic Biomass," Energies, MDPI, vol. 15(9), pages 1-25, April.
    2. Romero-García, J.M. & Susmozas, A. & Padilla-Rascón, C. & Manzanares, P. & Castro, E. & Oliva, J.M. & Romero, I., 2022. "Ethanol production from olive stones using different process strategies," Renewable Energy, Elsevier, vol. 194(C), pages 1174-1183.
    3. Eulogio Castro & Inmaculada Romero, 2021. "Biorefinery Based on Waste Biomass," Energies, MDPI, vol. 15(1), pages 1-3, December.

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