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Towards the optimisation of ceramic-based microbial fuel cells: A three-factor three-level response surface analysis

M J Salar-García¹, A de Ramón-Fernández², V M Ortiz-Martínez³

¹Bristol BioEnergy Centre, Bristol Robotic Laboratory, Block T, UWE, Bristol, Coldharbour Lane, Bristol BS16 1QY, United Kingdom.

Biochemical Engineering Journal

|April 23, 2019

Summary

Microbial fuel cells (MFCs) using human urine offer sustainable energy. A Box-Behnken design optimized MFC performance, identifying anode area and external resistance as key factors for maximizing power output.

Keywords:

00-01 99-00 Bioenergy Ceramic membranes Microbial fuel cells Modelling Response Surface Methodology

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Area of Science:

Environmental Science
Electrochemistry
Renewable Energy

Background:

Microbial fuel cells (MFCs) offer an eco-friendly solution to energy and water challenges.
Accurate MFC models are crucial for scaling up this technology, but are currently limited.

Purpose of the Study:

To evaluate the impact of operating parameters on air-breathing ceramic-based MFCs fed with human urine.
To develop a predictive model for optimizing MFC performance and energy harvesting.

Main Methods:

A three-factor, three-level Box-Behnken design was employed for 45 experimental runs.
Statistical analysis was used to determine the influence of anode area, external resistance, and membrane thickness.

Main Results:

Anode area and external resistance significantly influenced MFC power output more than membrane thickness.
Optimal conditions predicted a maximum power generation of 467.63 μW at specific parameter settings.
The developed second-order model demonstrated 88.6% accuracy.

Conclusions:

The Box-Behnken design model effectively optimizes energy harvesting from MFCs.
This approach significantly reduces experimental time and provides crucial data for MFC scale-up.