Enhancing corn stalk-based anaerobic digestion with different types of zero-valent iron added during the acidification stage: Performance and mechanism.

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  • Additional Information
    • Source:
      Publisher: IOS Press Country of Publication: Netherlands NLM ID: 100967627 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1001-0742 (Print) Linking ISSN: 10010742 NLM ISO Abbreviation: J Environ Sci (China) Subsets: MEDLINE
    • Publication Information:
      Publication: Amsterdam : IOS Press
      Original Publication: Beijing : Editorial Dept. of Journal of Environmental Sciences (China), 1989-
    • Subject Terms:
      Zea mays* ; Iron*/chemistry ; Methane*; Anaerobiosis ; Fatty Acids, Volatile ; Bioreactors
    • Abstract:
      Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn stalks. However, few studies have focused on the role of direct interspecies electron transfer (DIET) pathway in the acidification stage under the addition of different particle sizes of zero-valent iron (ZVI). In this study, three types of ZVI, namely iron filings, iron powder and nanoscale iron, were investigated, respectively, to enhance its high-value conversion. Variations in volatile fatty acids (VFAs) and methane (CH 4 ) production associated with the underlying mechanisms were emphatically determined. Results indicated that the addition of ZVI could increase the concentration of VFAs, with the most outstanding performance observed with the use of nanoscale iron. Importantly, the conversion of propionic acid to acetic acid was driven by adding ZVI with no between-group differences in acidizing phase. Conversely, the substrate was more fully utilized when supplied with iron powder compared with other groups in methanogenic phase, thereby displaying the maximum CH 4 yield with a value of 263.1 mL/(g total solids (TS)). However, adding nanoscale iron could signally shorten the digestion time (T 80 ), saving 7 days in comparison to the group of iron powder.
      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 © 2023. Published by Elsevier B.V.)
    • Contributed Indexing:
      Keywords: Anaerobic digestion; Corn stalk; Methane; Volatile fatty acids; Zero-valent iron
    • Accession Number:
      E1UOL152H7 (Iron)
      OP0UW79H66 (Methane)
      0 (Fatty Acids, Volatile)
    • Publication Date:
      Date Created: 20240606 Date Completed: 20240606 Latest Revision: 20240606
    • Publication Date:
      20240607
    • Accession Number:
      10.1016/j.jes.2023.07.040
    • Accession Number:
      38844324