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Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Published on: December 29, 2013

Investigating microbial fuel cell bioanode performance under different cathode conditions.

Abhijeet P Borole¹, Choo Y Hamilton, Douglas S Aaron

¹Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6226, USA. borolea@ornl.gov

Biotechnology Progress

|September 5, 2009

Summary

A novel microbial fuel cell (MFC) design enhances power output by optimizing anode performance and exploring cathode variations. This research introduces a new design parameter for comparing MFC configurations.

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Area of Science:

Electrochemistry
Bioelectrochemistry
Renewable Energy

Background:

Microbial fuel cells (MFCs) offer a promising avenue for sustainable energy generation.
Optimizing anode performance is crucial for maximizing MFC power density.
Existing MFC designs often face limitations in electrode spacing and dead volume.

Purpose of the Study:

To develop a microbial fuel cell (MFC) with an improved, compact anode design.
To investigate the impact of cathode modifications on MFC power density.
To determine if the anode design was limiting the overall MFC performance.

Main Methods:

Implementation of a flow-through, porous electrode design with minimal spacing and dead volume.
Enrichment of a biofilm-dominated anode consortium under continuous-flow conditions.
Systematic variation of cathode type and catholyte concentration to assess power output.

Main Results:

Achieved power densities of 56 W/m³ (air cathode) and up to 304 W/m³ (200 mM ferricyanide cathode).
Demonstrated that the anode was not limiting, with power density increasing with cathode performance.
Observed low internal solution resistance (5-6 Ω), supporting the efficient anode design.

Conclusions:

The developed MFC design significantly improves anode performance and overall power density.
Higher power outputs are achievable with advanced cathode systems capable of faster oxidation rates.
A novel design parameter (projected surface area to total anode volume ratio) is proposed for comparing MFCs.