Residual biomass potential in olive tree cultivation and olive oil industry in Spainvalorization proposal in a biorefinery context

  1. Paloma Manzanares 1
  2. Encarnación Ruiz 2
  3. Mercedes Ballesteros 1
  4. María J. Negro 1
  5. Francisco J. Gallego 2
  6. Juan C. López-Linares 2
  7. Eulogio Castro 2
  1. 1 CIEMAT, Biofuels Unit, Renewable Energies Division, Madrid, España
  2. 2 Universidad de Jaén, España
Journal:
Spanish journal of agricultural research

ISSN: 1695-971X,  2171-9292

Year of publication: 2017

Volume: 15

Issue: 3

Type: Article

DOI: 10.5424/SJAR/2017153-10868 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

More publications in: Spanish journal of agricultural research

Sustainable development goals

Abstract

Olive crop and olive oil industry generates several residues, i.e., olive tree pruning biomass (OTPB), extracted olive pomace (EOP) and olive leaves (OL) that could be used to produce high-added value products in an integrated biorefinery. OTPB is generated in the field as a result of pruning operation to remove old branches; EOP is the main residue of the pomace olive oil extracting industry after extraction with hexane of residual oil contained in olive pomace; and OL comes from the olive cleaning process carried out at olive mills, where small branches and leaves are separated by density. In this work, an analysis of the potential of OTPB, EOP and OL residues was addressed by estimating the production volumes at national level and the spatial distribution of these residues using geographic information system software. Information provided by public institutions and personal surveys to the industries was evaluated. Moreover, chemical analysis of the residues was undertaken and the results used to make a first assessment of valorization into biofuels such as bioethanol and bio based chemicals. Results show that close to 4.2 million tons/year of EOP, OL and OTPB derived from olive oil industry and olive tree cultivation in Spain could be available as a raw material for biorefineries in Spain. The analysis of the chemical characteristics indicates the relevant potential of these feedstocks for the production of bioethanol and other compounds such as phenols based on suitable processing and conversion routes, although techno-economic evaluations must be tackled to refine this approach.

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Funding information

Funding: Ministry of Economy and Competitiveness (Spain), R&D&I Programme towards Societal Challenges 2014 (Projects ENE2014-600090-C2-R-1 and ENE2014-600090-C2-R-2), including FEDER funds. Competing interests: authors have declared that no competing interests exist. Correspondence: should be addressed to Encarnación Ruiz: eruiz@ujaen.es

Funders

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