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John Greenman1, Buddhi Arjuna Mendis2, Iwona Gajda2

  • 1Bristol BioEnergy Centre, Bristol Robotics Laboratory, University of the West of England, BS16 1QY, UK; Biological, Biomedical and Analytical Sciences, University of the West of England, BS16 1QY, UK.

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|February 17, 2022
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Summary
This summary is machine-generated.

Microbial fuel cells (MFCs) using thin biofilms on perfusable anodes can act like chemostats. This allows for controlled, continuous electricity generation from waste by adjusting flow rate.

Keywords:
ChemostatDilution rateElectrical powerGrowth rateMFCSteady state

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Area of Science:

  • Electrochemistry
  • Environmental Science
  • Microbiology

Background:

  • Microbial Fuel Cells (MFCs) offer a sustainable method for electricity generation from organic waste using electroactive biofilms.
  • Traditional MFC models often assume thick, diffusion-limited biofilms, which may not represent all operational conditions.
  • Understanding biofilm behavior is key to optimizing MFC performance and energy output.

Purpose of the Study:

  • To present a novel model for "thin" biofilms in continuous flow MFCs with highly perfusable anodes.
  • To explore the chemostat-like behavior of these MFC systems.
  • To identify new control parameters for MFC power output and growth rate.

Main Methods:

  • Review and theoretical modeling of "thin" electroactive biofilms on non-diffusible anodes in continuous flow MFCs.
  • Analysis of biofilm properties in relation to chemostat principles (steady-state growth, dilution rate).
  • Exploration of MFC operational parameters, including resistive load and flow rate, as control mechanisms.

Main Results:

  • The model demonstrates that thin biofilms on perfusable anodes exhibit chemostat-like properties, including steady-state growth and potential for multiple steady states.
  • Continuous steady-state growth correlates with continuous metabolic activity and electrical power production.
  • Both external resistive load and, novelly, flow/dilution rate can control MFC growth rate and power output.

Conclusions:

  • MFCs with thin biofilms on perfusable anodes can be modeled as chemostats, offering predictable performance.
  • Flow rate presents a viable alternative to resistive load for controlling MFC growth and power output.
  • This model provides new insights for optimizing the design and operation of continuous flow MFCs for efficient bioenergy production.