Direct inoculation of a biotrickling filter for hydrogenotrophic methanogenesis

Brian Dahl Jønson, Mads Ujarak Sieborg, Muhammad Tahir Ashraf, Lars Yde, Juhee Shin, Seung Gu Shin, Jin Mi Triolo*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Hydrogenotrophic biomethanation in a biotrickling filter has been reported to be a proven technology for biological biogas upgrading in recent studies. However, the preparation of enriched hydrogenotrophic methanogens in a separate reactor prior to biomethanation in a trickled bed is a lengthy procedure and therefore hard to apply on an industrial scale. This study explored the direct inoculation of anaerobic biogas digestate for simultaneous enrichment of hydrogenotrophic methanogens and biofilm immobilisation in a trickled bed system. The direct inoculation and formation of hydrogenotrophic biofilm was successful and resulted in a stable H 2 loading rate of 11 Nm H 2 3m R -3d -1, with the highest specific methane productivity recorded at 3.03 Nm 3m R -3d -1 and a purity of 98% CH 4 in thermophilic conditions. The DNA analysis confirmed that hydrogenotrophic methanogens dominated the archaeal consortia.

Original languageEnglish
Article number124098
JournalBioresource Technology
Volume318
Number of pages8
ISSN0960-8524
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Biofuel
  • Biogas
  • Biomethanation
  • Biomethane
  • Inoculation
  • Power-to-gas

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