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Kiwi waste was successfully used as fuel in microbial fuel cells (MFCs) to generate bioelectricity, with an electrical conductivity of 189.82 ± 3.029 mS/cm and a maximum power density of 212.68 ± 26.84 mW/m².

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Representative MFC — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MFC

What worked

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Abstract

This research aimed to use kiwi waste as fuel to generate bioelectricity through microbial fuel cells. It was possible to generate an electrical current and voltage peaks of 3.807 ± 0.102 mA and 0.993 ± 0.061 V on day 11, showing an electrical conductivity of 189.82 ± 3.029 mS/cm and an optimum operating pH of 5.966 ± 0.121. The internal resistance of the cells was calculated using Ohm’s Law, resulting in a value of 14.957 ± 0.394 Ω, while the maximum power density was 212.68 ± 26.84 mW/m² at a current density of 4.506 A/cm². Through the analysis of the FTIR spectra carried out on the substrate, a decrease in the characteristic organic peaks was observed due to their decomposition during the electricity-generation process. In addition, it was possible to molecularly identify the bacteria Comamonas testosteroni, Sphingobacterium sp., and Stenotropho-monas maltophila adhered to the anodized biofilm. Finally, the capacity of this residue to generate bioelectricity was demonstrated by lighting an LED bulb with a voltage of 2.85 V.

Key findings

  • Electrical current and voltage peaks of 3.807 ± 0.102 mA and 0.993 ± 0.061 V were achieved on day 11.
  • Internal resistance of the cells was calculated to be 14.957 ± 0.394 Ω.
  • Comamonas testosteroni, Sphingobacterium sp., and Stenotrophomonas maltophila bacteria were identified adhered to the anodized biofilm.

Keywords

Microbial fuel cellRenewable energyInternal resistancePulp and paper industryVoltageAnalytical Chemistry (journal)

Identifiers

DOI
10.3390/fermentation9050446
Journal
Fermentation
Year
2023