Biogas Upgrading by Hydrogenotrophic Methanogens: An Overview

Subhasree Ray, Chandrasekhar Kuppam, Soumya Pandit, Prasun Kumar

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Hydrogenotrophic methanogens play a key role in methane (CH4) production during various wastes’ anaerobic digestion (AD). The metabolism of hydrogenotrophic methanogens involves Wolfe-cycle to reduce carbon dioxide (CO2) to CH4 using hydrogen as feed. Hydrogenotrophic methanogenesis is a potential process for up-gradation of biogas and renewable power intermittency. This review focuses on enhancing hydrogenotrophic methanogenesis for the up-gradation of biogas and, more importantly, a hybrid system that couples both in-situ and ex-situ approaches in one unit. Upgradation of biogas by hydrogenotrophic methanogenesis is advantageous for achieving a higher concentration of CH4 and removing trace elements and CO2 from biogas. This approach helps to decrease the cost of upgrading biogas to natural gas quality. Using microbial electrolysis cells coupled with AD could be a potential alternative to increase the CH4 production yield and remove CO2 from biogas. The exploitation of the hydrogen gas and integration of the available technologies on a large scale could be explored in future work and help in realizing the production of clean CH4 in an industrial set-up. This review summarizes the metabolic background of hydrogenotrophic methanogens and their efficient utilization towards methane production. Limited works are available in public domain covering this aspect and thus a review article is important for the readers to update their understanding and research work in light of recent findings. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)537-552
Number of pages16
JournalWaste and Biomass Valorization
Volume14
Issue number2
DOIs
StatePublished - 1 Feb 2023
Externally publishedYes

Keywords

  • Acetoclastic
  • Hydrogenotrophic
  • Methane
  • Methylotrophic
  • Microbial electrolysis cells

ASJC Scopus subject areas

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

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