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Researchers developed a 4-unit MFC using Vicia faba crop residues and exoelectrogenic bacteria to generate electricity, achieving a maximum potential of 802 mV and power density of 283 mW/m².

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What they did

System
MFC

What worked

Power density283mW/m²
Current density1.26A/m²

Abstract

Microbial fuel cells (MFC) simultaneously degrade organic substrates and generate electricity in a sustainable and eco-friendly way. Here, we built a 4-unit MFC and studied the efficiency of MFC at different conditions, including pH, substrate concentration of Vicia faba agricultural wastes with exoelectrogenic bacteria P. aeruginosa. The exoelectrogenic bacteria were obtained from industrial effluents and used to inoculate the MFCs. The optimized conditions in terms of yielding maximum potential of 802 mV, yielding maximum power density of 283 mW mb2 were reported at a substrate concentration of 6 g Lb1 of V. faba waste and pH of 5.5, corresponding to a current density 1255.93 mA mb2. Using exoelectrogenic bacteria from industrial effluents and agricultural wastes resulted in efficient MFC. Thus, the developed MFCs using V. faba agricultural wastes can be used in rural areas that have limited access to electricity, by reusing agricultural wastes and concomitant electricity generation.

Key findings

  • Optimized conditions for MFC efficiency were found at a substrate concentration of 6 g/L of V. faba waste and pH of 5.5.
  • The use of exoelectrogenic bacteria from industrial effluents and agricultural wastes resulted in efficient MFC performance.
  • The developed MFCs can be used in rural areas with limited access to electricity by reusing agricultural wastes and generating electricity.

Keywords

Microbial fuel cellEffluentPulp and paper industryVicia fabaElectricity generationWaste management

Identifiers

DOI
10.15255/cabeq.2020.1857
Journal
Chemical & biochemical engineering quarterly
Year
2020