Elucidation of microbial interactions, dynamics, and keystone microbes in high pressure anaerobic digestion

Ajay Thapa, Jeong Hoon Park, Seung Gu Shin, Hong Mok Jo, Min Sang Kim, Yeongmi Park, Uijeong Han, Si Kyung Cho

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

High-pressure anaerobic digestion (HPAD) is a promising technology for producing biogas enriched with high methane content in a single-step process. To enhance HPAD performance, a comprehensive understanding of microbial community dynamics and their interactions is essential. For this, mesophilic batch high-pressurized anaerobic reactors were operated under 3 bars (H3) and 6 bars (H6). The experimental results showed that the effect of high-pressure (up to 6 bar) on acidification was negligible while methanogenesis was significantly delayed. Microbial analysis showed the predominance of Defluviitoga affiliated with the phylum Thermotogae and the reduction of Thiopseudomonas under high-pressure conditions. In addition, the microbial cluster pattern in H3 and H6 was significantly different compared to the CR, indicating a clear shift in microbial community structure. Moreover, Methanobacterium, Methanomicrobiaceae, Alkaliphilus, and Petrimonas were strongly correlated in network analysis, and they could be identified as keystone microbes in the HPAD reactor.

Original languageEnglish
Article number159718
JournalScience of the Total Environment
Volume858
DOIs
StatePublished - 1 Feb 2023

Keywords

  • Anaerobic digestion
  • High pressure
  • Keystone microbes
  • Network analysis
  • Next generation sequencing

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