Role of KOH-activated biochar on promoting anaerobic digestion of biomass from Pennisetumgianteum.

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  • Author(s): Liu QH;Liu QH;Liu QH; Sun HY; Sun HY; Sun HY; Yang ZM; Yang ZM
  • Source:
    Journal of environmental management [J Environ Manage] 2024 Feb 27; Vol. 353, pp. 120165. Date of Electronic Publication: 2024 Jan 25.
  • Publication Type:
    Journal Article
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Academic Press Country of Publication: England NLM ID: 0401664 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1095-8630 (Electronic) Linking ISSN: 03014797 NLM ISO Abbreviation: J Environ Manage Subsets: MEDLINE
    • Publication Information:
      Original Publication: London ; New York, Academic Press.
    • Subject Terms:
      Bioreactors* ; Fatty Acids, Volatile*; Anaerobiosis ; Biomass ; Charcoal ; Methane
    • Abstract:
      Pennisetum giganteum is a promising non-food crop feedstock for biogas production due to its high productivity and bio-methane potential. However, the accumulation of volatile fatty acids (VFA) usually restricts the conversion efficiency of P. giganteum biomass (PGB) during anaerobic digestion (AD). Here, the role of KOH-activated biochar (KB) in improving the AD efficiency of PGB and the related mechanisms were investigated in detail. The results revealed that KB exhibited excellent electrical conductivity, electron transfer capacity and specific capacitance, which might be related to the decrease in the electron transfer resistance after adding KB to the AD process. In addition, the KB addition not only reinforced metabolisms of energy and VFAs but also promoted the conversion of VFAs to methane, leading to a 52% increase in the methane production rate. Bioinformatics analysis showed that Smithella and Methanosaeta were key players in the KB-mediated AD process of PGB. The stimulatory effect of methanogenesis probably resulted from the establishment of direct interspecies electron transfer (DIET) between VFA-oxidizing acetogens (e.g., Smithella) and Methanosaeta. These findings provided a key step to improve the PGB-based AD process.
      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: Anaerobic digestion; Biochar; Methane; Pennisetum gianteum
    • Accession Number:
      0 (biochar)
      0 (Fatty Acids, Volatile)
      16291-96-6 (Charcoal)
      OP0UW79H66 (Methane)
    • Publication Date:
      Date Created: 20240126 Date Completed: 20240219 Latest Revision: 20240219
    • Publication Date:
      20240219
    • Accession Number:
      10.1016/j.jenvman.2024.120165
    • Accession Number:
      38278119