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A self-sustaining microbial fuel cell was developed, combining bacterial and microalgal processes to achieve a maximum power density of 7.13 mW m⁻² and comparable chemical oxygen demand removal efficiencies.

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What they did

System
MFC

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Abstract

Abstract A microbial fuel cell (MFC) consisting of a bacterial anode chamber and a microalgal cathode chamber was operated under various conditions to assess its technical feasibility. Maximum achievable power density reached up to 7.13 mW m –2 . The traditional MFC process of conversion of carbon sources to bioelectricity in the anodic chamber was compared with a system circulating anodic effluent to the cathode chamber. The bacteria and microalgae simultaneously carried out the carbon recycling and recovery of energy and resources synergizing the performance of MFC. Results indicated a comparable chemical oxygen demand removal efficiencies at 50% of the retention time compared to the traditional system. The dissolved oxygen concentration varied between 11.95 and 7.44 mg L –1 with Chlorella vulgaris under alternative light and dark cycles. Despite the variations in electricity output, the system showed its technical feasibility to harness energy for photosynthesis under natural sunlight conditions.

Key findings

  • Maximum achievable power density reached up to 7.13 mW m⁻²
  • Comparable chemical oxygen demand removal efficiencies at 50% of the retention time compared to the traditional system
  • Dissolved oxygen concentration varied between 11.95 and 7.44 mg L⁻¹ with Chlorella vulgaris under alternative light and dark cycles

Keywords

Microbial fuel cellChlorella vulgarisAnodeChemical energyEffluentChemical oxygen demand

Identifiers

DOI
10.1002/appl.202200127
Journal
Applied Research
Year
2023