Valorization of residual biomass from olive crop and olive mills under a biorefinery approach

  1. Encarnación Ruiz Ramos 1
  2. Inmaculada Romero 1
  3. Cristóbal Cara 1
  4. Manuel Moya 1
  5. Eulogio Castro 1
  6. Juan Carlos López-Linares 1
  7. Juan Miguel Romero-García 1
  8. Carlos Martínez-Patiño 1
  9. Manuel Jesús Díaz Villanueva 1
  10. Paloma Manzanares 2
  1. 1 Universidad de Jaén, Department of Chemical, Environmental and Material Engineering, Universidad de Jaén, Campus Las Lagunillas, 23071 Jaen, Spain
  2. 2 Biofuels Unit. Renewable Energies Division. CIEMAT. Avda. Complutense 40, 28040 Madrid, Spain.
Actas:
BioRemid 2017- International Meeting on New Strategies in Bioremdiation Processes

Editorial: Universidad de Granada

ISBN: 978-84-617-9009-8

Año de publicación: 2017

Páginas: 70

Tipo: Aportación congreso

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Resumen

Background: Olive tree cultivation involves generation of large amounts of lignocelulosic biomass derived from pruning. This olive tree pruning biomass (OTB) is usually burned or grinded and scattered on the field. On the other hand, olive leaves and thin branches are also generated during the olive collection and they should be separated from olives in the olive mills before olive oil production. This residue, olive mill leaves (OML) lacks also of any add-value application.Objectives: The aim of this study was the valorization of OTP and OML residues for the production of bioethanol and other add-value compounds. Specifically, the main purpose of the work was the comparison between the two residues in terms on sugar recovery after a delignification process.Methods: OTB and OML were characterized using the National Renewable Energy Laboratory (NREL) methodology for biomass. Alkaline peroxide delignification was performed at 80ºC and pH 11.5. Further enzymatic hydrolysis was carried out to evaluate the role of the delignification step on the carbohydrate saccharification.Conclusions: The main differences between OTB and OML composition are the lower amount of structural sugars in the case of OML (19% ѵs 40% in OTB) and the higher content in extractive compounds (45% ѵs 26% in OTB). Interesting add-value compounds could be obtained from thesolubilization of extractives as antioxidants compounds, sugars and mannitol. Alkaline peroxide delignification is more effective in the case of extracted OTB reaching up to 80% of lignin removal and a significant increase in enzymatic hydrolysis yield.