Assessing the potential of olive mill solid waste as feedstock for methane and volatile fatty acids production via anaerobic bioprocesses.

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  • Additional Information
    • Source:
      Publisher: Elsevier Country of Publication: Netherlands NLM ID: 101465345 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1876-4347 (Electronic) Linking ISSN: 18716784 NLM ISO Abbreviation: N Biotechnol Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam : Elsevier
    • Subject Terms:
      Methane*/metabolism ; Methane*/biosynthesis ; Fatty Acids, Volatile*/metabolism ; Olea*/metabolism ; Olea*/chemistry ; Solid Waste*/analysis; Anaerobiosis ; Biofuels ; Fermentation ; Bioreactors
    • Abstract:
      The extensive production of olive mill solid waste (OMSW) from olive oil industry in the Mediterranean basin claims effective treatments and valorization strategies. This study aims to elucidate the potential of anaerobic digestion (AD) and anaerobic fermentation (AF) to convert pre-treated OMSW into biogas (CH 4 ) and volatile fatty acids (VFA), respectively. The two thermal treatment conditions (65 °C and 180 °C) that are being implemented in the industry that manages the OMSW were tested. Comparing the two treatments aims to demonstrate the influence on the AD process of the degree of solubilization and degradation of the metabolites produced from the same substrate. AD of OMSW treated at low-temperature (65 °C) exhibited similar methane yields (195 ± 8 mL CH 4 /g volatile solid (VS)) to raw OMSW. AD of the solid phase (SP) after high-temperature treatment with acid addition at 180 °C resulted in methane yields comparable to raw OMSW while the liquid phase (LP) exhibited low methane yields (85 ± 10 mL CH 4 /g VS). Nevertheless, LP/180 °C exhibited the highest VFA bioconversion at 27.6 %, compared to less than 10 % for SP/180 ºC, SP/65 °C, and raw OMSW. The VFA profile showed notable variations with thermal treatment temperatures. Propionic acid dominated at SP/65 °C, while acetic acid became the primary VFA at 180 °C. Furthermore, significant degradation rates of phenolic compounds and furans were observed during the final day of both anaerobic processes. Overall, these findings suggest that AD is more suitable for raw OMSW, treated at low temperature and SP at high temperature, while AF offers a promising alternative for high-temperature-treated LP.
      Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
    • Contributed Indexing:
      Keywords: Anaerobic bioprocesses; Biomethane; Biorefinery; Furans; Phenolic compounds; Volatile fatty acid
    • Accession Number:
      OP0UW79H66 (Methane)
      0 (Fatty Acids, Volatile)
      0 (Solid Waste)
      0 (Biofuels)
    • Publication Date:
      Date Created: 20241002 Date Completed: 20241202 Latest Revision: 20241202
    • Publication Date:
      20241204
    • Accession Number:
      10.1016/j.nbt.2024.09.009
    • Accession Number:
      39357797