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A selection method is described to develop an electrogenic consortium for improved power generation in microbial fuel cells (MFCs).

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What they did

System
MFC

What worked

Power density129mW/m²

Abstract

Summary A selection method to develop an electrogenic consortium for improved power generation in microbial fuel cells (MFCs) is described. Raw domestic sewage was inoculated in a nutrient medium with Fe(III) hydroxide as the electron acceptor and subculturing was done. Subcultures were tested for Fe(III) reduction using ferrozine assay, microbial electron transfer activity using the Dye Reduction‐based Electron‐transfer Activity Monitoring (DREAM) assay and power generation in a MFC. Subcultures grown with Fe(III) demonstrated improvements in electron transfer activity and power generating ability, while cultures grown without Fe(III) did not exhibit these properties. The enriched Fe(III) subculture generated a maximum power density of 129.25 ± 7 mW/m 2 , while the subculture grown without Fe(III) generated only 81.54 ± 8 mW/m 2 . A high correlation was observed between DREAM assay and power generation (r = +0.963). Cyclic voltammetry corroborated the high electrochemical activity of the Fe‐enriched subculture. This method offers a simple and efficient way to enrich an electrogenic consortium for improved performance from routinely used inocula.

Key findings

  • Subcultures grown with Fe(III) demonstrated improvements in electron transfer activity and power generating ability.
  • The enriched Fe(III) subculture generated a maximum power density of 129.25 ± 7 mW/m².
  • A high correlation was observed between DREAM assay and power generation (r = +0.963).

Keywords

Microbial fuel cellSubculture (biology)Electron transferElectron acceptorElectricity generationChemical engineering

Identifiers

DOI
10.1002/er.6154
Journal
International Journal of Energy Research
Year
2020