Mesophilic and thermophilic fermentation of activated sludge for volatile fatty acids production: focusing on anaerobic degradation of carbohydrate and protein.

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  • Additional Information
    • Source:
      Publisher: Taylor & Francis Country of Publication: England NLM ID: 9884939 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1479-487X (Electronic) Linking ISSN: 09593330 NLM ISO Abbreviation: Environ Technol Subsets: MEDLINE
    • Publication Information:
      Publication: 2008- : Oxford : Taylor & Francis
      Original Publication: London : Publications Division, Selper Ltd., 1990-
    • Subject Terms:
      Sewage*/microbiology ; Fatty Acids, Volatile*/metabolism ; Fermentation*; Anaerobiosis ; Bioreactors ; Proteins/metabolism ; Waste Disposal, Fluid/methods ; Carbohydrate Metabolism ; Carbohydrates
    • Abstract:
      The volatile fatty acids (VFAs) productions, as well as particulate organics decomposition, soluble chemical oxygen demand (SCOD) yield, and the VFAs production pathways from mesophilic and thermophilic anaerobic fermentation in waste activated sludge were investigated. Batch experiments showed that the decomposition rate of volatile suspended solids (VSS), particulate carbohydrate (P-C) and particulate protein (P-P) followed the first-order kinetic model at different temperatures. However, the intermediates, accumulated in the process of protein or carbohydrate digestion had a more significant inhibitory effect on the production of VFAs during the mesophilic anaerobic acidification process. The production of VFAs by thermophilic anaerobic fermentation is 2086.05 mg COD/L, which is about twice the production under mesophilic conditions. Among them, the concentration and proportion of high molecular weight organic acids such as isobutyric acid (320.29 mgCOD/L) and isovaleric acid (745.75 mgCOD/L) are relatively high. Then 13 C stable isotope labelling experiment demonstrated that, the decomposition of carbohydrates yields 77% acetic acid and 86% butyric acid, while protein breakdown produces 85% propionic acid and 99% valeric acid. This confirms that carbohydrates are more favourable for the formation of even-carbon organic acids, while proteins tend to yield odd-carbon organic acids. Additionally, this helps refine the pathway for valeric acid formation during anaerobic acidogenesis.
    • Contributed Indexing:
      Keywords: Anaerobic hydrolysis and acidification; Mesophilic; Thermophilic; Volatile fatty acids; Waste activated sludge
    • Accession Number:
      0 (Sewage)
      0 (Fatty Acids, Volatile)
      0 (Proteins)
      0 (Carbohydrates)
    • Publication Date:
      Date Created: 20240129 Date Completed: 20241118 Latest Revision: 20241118
    • Publication Date:
      20241118
    • Accession Number:
      10.1080/09593330.2024.2306152
    • Accession Number:
      38286139