Enhancing biogas and electricity recovery using an iron-manganese oxide catalyzed bioanode in an integrated submersible microbial fuel cell-anaerobic digester

Rana Basit Ali, Md Tabish Noori, Sang Hoon Lee, Hee Deung Park, Booki Min

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Submersible microbial fuel cell-anaerobic digestion (SMFC-AD) systems offer biogas up-gradation along with electricity generation but require improved anodic kinetics for better performance. In this study, iron-manganese oxide (FeMnO3) nanoparticles were synthesized by chemical precipitation method and used as an anodic catalyst in SMFC-AD to improve the redox chemistry at anode thereby enhancing the overall reactor performance. Moreover, the performance of integrated SMFC-AD with and without the catalyst was evaluated under different external resistance (Rext) viz 10 Ω, 100 Ω, and 1000 Ω. SMFC-AD with the catalyst demonstrated a maximum methane yield of 0.436 ± 0.007 L-CH4/gCOD at a Rext of 1000 Ω, followed by a methane yield of 0.406 ± 0.008 L-CH4/gCOD and 0.384 ± 0.003 L-CH4/gCOD at 10 Ω and 100 Ω, respectively. However, SMFC-AD at 100 Ω exhibited the maximum current and power generations of 2.11 mA and 0.46 W/m2, respectively, which were significantly higher than the values obtained for 10 Ω (0.22 mA, 0.21 W/m2) and 1000 Ω (0.38 mA, 0.19 W/m2). Microbial community analyses revealed the enrichment of exoelectrogenic and methanogenic microbial consortia (Geobacter and Methanobacteria) in the anodic biofilm increasing the interspecies electron transfer reactions.

Original languageEnglish
Article number102276
JournalSustainable Energy Technologies and Assessments
Volume52
DOIs
Publication statusPublished - 2022 Aug

Keywords

  • Anaerobic digestion
  • Iron-manganese oxide
  • Methane upgradation
  • Methanogenesis
  • Microbial fuel cell

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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