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Upgrading Major Waste Streams Derived from the Biodiesel Industry and Olive Mills via Microbial Bioprocessing with Non-Conventional IYarrowia lipolytica/I Strains

Fermentation (Basel), 2023-03, Vol.9 (3) [Peer Reviewed Journal]

COPYRIGHT 2023 MDPI AG ;ISSN: 2311-5637 ;EISSN: 2311-5637 ;DOI: 10.3390/fermentation9030251

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  • Title:
    Upgrading Major Waste Streams Derived from the Biodiesel Industry and Olive Mills via Microbial Bioprocessing with Non-Conventional IYarrowia lipolytica/I Strains
  • Author: Sarris, Dimitris ; Tsouko, Erminta ; Kothri, Maria ; Anagnostou, Maria ; Karageorgiou, Eleni ; Papanikolaou, Seraphim
  • Subjects: Fuel industry ; Industrial wastes ; Management ; Mills and mill-work ; Waste management
  • Is Part Of: Fermentation (Basel), 2023-03, Vol.9 (3)
  • Description: This study reports the development of a bioprocess involving the valorization of biodiesel-derived glycerol as the main carbon source for cell proliferation of Yarrowia lipolytica strains and production of metabolic compounds, i.e., citric acid (Cit), polyols, and other bio-metabolites, the substitution of process tap water with olive mill wastewater (OMW) in batch fermentations, and partial detoxification of OMW (up to 31.1% decolorization). Increasing initial phenolics (Phen) of OMW-glycerol blends led to substantial Cit secretion. Maximum Cit values, varying between 64.1–65.1 g/L, combined with high yield (Y[sub.Cit/S] = 0.682–0.690 g Cit/g carbon sources) and productivity (0.335–0.344 g/L/h) were achieved in the presence of Phen = 3 g/L. The notable accumulation of endopolysaccharides (EPs) on the produced biomass was determined when Y. lipolytica LMBF Y-46 (51.9%) and ACA-YC 5033 (61.5%) were cultivated on glycerol-based media. Blending with various amounts of OMW negatively affected EPs and polyols biosynthesis. The ratio of mannitol:arabitol:erythritol was significantly affected (p < 0.05) by the fermentation media. Erythritol was the major polyol in the absence of OMW (53.5–62.32%), while blends of OMW-glycerol (with Phen = 1–3 g/L) promoted mannitol production (54.5–76.6%). Nitrogen-limited conditions did not favor the production of cellular lipids (up to 16.6%). This study addressed sustainable management and resource efficiency enabling the bioconversion of high-organic-load and toxic waste streams into valuable products within a circular bioeconomy approach.
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 2311-5637
    EISSN: 2311-5637
    DOI: 10.3390/fermentation9030251
  • Source: ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
    DOAJ Directory of Open Access Journals
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