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Simultaneous electricity generation and microbially-assisted electrosynthesis in ceramic MFCs.

Iwona Gajda1, John Greenman2, Chris Melhuish1

  • 1Bristol BioEnergy Centre, Bristol Robotics Laboratory, Block T, UWE, Bristol, Coldharbour Lane, Bristol BS16 1QY, UK.

Bioelectrochemistry (Amsterdam, Netherlands)
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Summary

This study introduces novel ceramic microbial fuel cells (MFCs) that generate electricity and produce chemicals. These systems offer a sustainable method for carbon capture and storage (CCS) by converting CO2 into carbonate salts.

Keywords:
Catholyte generationMicrobially assisted electrosynthesisTerracotta MFCWater recoveryWet scrubbing

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Area of Science:

  • Environmental Science
  • Electrochemistry
  • Microbiology

Background:

  • Microbially assisted synthesis in Bioelectrochemical Systems (BESs) traditionally consumes energy.
  • Existing BESs focus on electrosynthesis driven by external energy input.

Purpose of the Study:

  • To report novel ceramic microbial fuel cell (MFC) systems that generate electricity and perform electrosynthesis simultaneously.
  • To demonstrate a practical application of these MFCs for chemical production and carbon capture.
  • To investigate the potential of MFCs for sustainable energy generation and carbon management.

Main Methods:

  • Development of inexpensive, low-maintenance, terracotta-based tubular MFCs.
  • Operation of MFCs to generate electrical power and assess chemical production.
  • Analysis of catholyte composition and CO2 fixation capabilities.
  • Measurement of chemical oxygen demand (COD) reduction.

Main Results:

  • MFCs produced sufficient electricity to continuously power an LED for 7 days.
  • Achieved a 92% reduction in chemical oxygen demand (COD).
  • Generated an alkaline catholyte capable of fixing atmospheric CO2 into carbonate/bicarbonate salts.
  • Demonstrated a direct correlation between power generation and alkaline solution production.

Conclusions:

  • Novel ceramic MFCs can simultaneously generate electricity and drive electrosynthesis.
  • This technology offers a practical application for sustainable chemical production.
  • The MFC system functions as an effective carbon capture and storage (CCS) mechanism via wet caustic scrubbing on the cathode.
  • The approach provides a low-cost, low-maintenance solution for energy generation and carbon dioxide sequestration.