Interference of extracellular soluble algal organic matter on flocculation-sedimentation harvesting of Chlorella sp.

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  • Additional Information
    • Source:
      Publisher: Elsevier Applied Science Country of Publication: England NLM ID: 9889523 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2976 (Electronic) Linking ISSN: 09608524 NLM ISO Abbreviation: Bioresour Technol Subsets: MEDLINE
    • Publication Information:
      Original Publication: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991-
    • Subject Terms:
      Chlorella*/metabolism ; Flocculation*/drug effects ; Solubility*; Hydrogen-Ion Concentration ; Organic Chemicals/pharmacology ; Microalgae/metabolism ; Extracellular Space/chemistry ; Molecular Weight ; Chitosan/chemistry ; Chitosan/pharmacology
    • Abstract:
      Extracellular soluble algal organic matter (AOM) significantly interferes with microalgae flocculation. This study investigated the effects of various AOM fractions on Chlorella sp. flocculation using ferric chloride (FeCl 3 ), sodium hydroxide (NaOH), and chitosan. All flocculants achieved high separation efficiency (87-99 %), but higher dosages were required in the presence of AOM. High molecular weight (>50 kDa) AOM fraction was identified as the primary inhibitor of flocculation across different pH levels, whereas low/medium molecular weight (<3 and <50 kDa) AOM had minimal impact. Compositional analysis revealed that the inhibitory AOM fraction is a glycoprotein rich in carbohydrates, including neutral, amino, and acidic sugars. The significance of this study is in identifying carboxyl groups (-COOH) from acidic monomers in >50 kDa AOM that inhibit flocculation. Understanding AOM composition and the interaction dynamics between AOM, cells, and flocculants is crucial for enhancing the techno-economics and sustainability of flocculation-based microalgae harvesting.
      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 Elsevier Ltd. All rights reserved.)
    • Contributed Indexing:
      Keywords: Biomass; Dewatering; Heteropolysaccharides; Microalgae; Ultrafiltration
    • Accession Number:
      0 (Organic Chemicals)
      9012-76-4 (Chitosan)
    • Publication Date:
      Date Created: 20240817 Date Completed: 20240911 Latest Revision: 20240911
    • Publication Date:
      20240912
    • Accession Number:
      10.1016/j.biortech.2024.131290
    • Accession Number:
      39153690