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Agathe Paitier1, Alexiane Godain1, Delina Lyon1

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Understanding microbial communities in microbial fuel cells (MFCs) is key for energy production. This study reveals that bacterial communities in MFC anodes continue to evolve even after stable voltage output, with Geobacter being dominant.

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Area of Science:

  • Microbial Ecology
  • Bioelectrochemistry
  • Environmental Science

Background:

  • Optimizing energy production in microbial fuel cells (MFCs) requires a thorough understanding of the anodic microbial communities.
  • The development and stability of electro-active biofilms are critical for MFC performance.

Purpose of the Study:

  • To determine the taxonomic structure of bacterial communities on MFC anodes during biofilm formation and development.
  • To evaluate microbial community dynamics in relation to time and electrical performance.

Main Methods:

  • Utilized 16S rRNA gene-based phylogenetic microarrays for taxonomic analysis.
  • Employed flow cytometry to assess microbial activity and community dynamics.
  • Inoculated MFCs with fresh primary clarifier overflow.

Main Results:

  • The bacterial community partially stabilized but did not completely stabilize concurrently with stable voltage output.
  • Geobacter emerged as the predominant genus, with its growth correlating to voltage output.
  • Some genera continued to develop or decline even after voltage stabilization.
  • Flow cytometry indicated that some genera with decreasing fluorescence were still active respiring bacteria.

Conclusions:

  • Anodic biofilm selection and maturation persist beyond 20 days of MFC operation.
  • Microbial community evolution continues for over 10 days after voltage stabilization.
  • Ongoing microbial dynamics influence MFC performance even in seemingly stable states.