Effect of microbial community structure in inoculum on the stimulation of direct interspecies electron transfer for methanogenesis

Hyun Jin Kang, Sang Hoon Lee, Tae Guen Lim, Hee Deung Park

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To investigate how the seed microbial community structure affects the improvement of methanogenesis efficiency through direct interspecies electron transfer (DIET), a biomethane potential (BMP) test was conducted using sludge collected from a total of six anaerobic digesters. DIET-stimulating microbial populations were investigated by 16S rRNA gene sequence analysis. Correlations between microbial community composition and methane production performance by DIET were analyzed. The methane production rate increased under all conditions when granular activated carbon (GAC) was injected regardless of the inoculum type. However, redundancy analysis indicated a significant correlation between the inoculum microbial community and lag time. In a network analysis, Methanolinea species distributed in the inocula formed a single modularity with lag time, suggesting that the methanogens in the inocula might reduce the lag time of methanogenesis through DIET. Overall, this study revealed that the inoculum microbial community composition is an important factor affecting methane production efficiency by DIET.

Original languageEnglish
Article number125100
JournalBioresource technology
Volume332
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • Direct interspecies electron transfer (DIET)
  • Inoculum
  • Methanogenesis
  • Methanogenic performance
  • Microbial community structure

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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