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A dual-chamber microbial fuel cell was used to produce bioelectricity from food residue biomass, with optimal performance achieved at 6 g COD L⁻¹, resulting in a maximum power density of 29.6 mW m⁻².

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What they did

System
MFC

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Abstract

In this study, the use of a dual-chamber microbial fuel cell for the production of bioelectricity from a food residue biomass (FORBI) product was investigated. Food residue biomass was produced by drying and shredding the pre-sorted fermentable fraction of household food waste collected door-to-door in the Municipality of Halandri, Athens, Greece. Different organic loads of food residue biomass expressed as chemical oxygen demand (COD) were examined (0.7, 0.9, 1.4, 2.8, 6 and 14 g COD L −1 , respectively). It was observed that an increase of the initial concentration of the final extract resulted in a corresponding increase in the operating time. The microbial fuel cell potential increased from 33.3 mV to 46 mV as the concentration was increased from 0.7 to 14 g COD L −1 . The best performance in terms of maximum power density (29.6 mW m −2 ) corresponding to a current density of 88 mA m −2 was observed for 6 g COD L −1 . Setting the external resistance at its optimal value (R ext = 2 kΩ) as determined by polarisation experiments, P yield drastically increased to 13.7 and 17.3 Joule (g FORBI) −1 in two consecutive cycles. The results demonstrate that readily biodegradable substrates, such as food residue biomass, can be effectively used for enhanced bioelectricity harvesting in a microbial fuel cell.

Key findings

  • Increasing the initial concentration of food residue biomass increased the operating time and microbial fuel cell potential.
  • The best performance in terms of maximum power density was observed at 6 g COD L⁻¹.
  • A maximum power density of 29.6 mW m⁻² was achieved at 6 g COD L⁻¹.

Keywords

Microbial fuel cellFood wasteChemical oxygen demandResidue (chemistry)Pulp and paper industryBiomass (ecology)

Identifiers

DOI
10.1177/0734242x18796935
Journal
Waste Management & Research: The Journal for a Sustainable Circular Economy
Year
2018