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This study investigates the performance of a dual compartment microbial fuel cell (MFC) in removing chemical oxygen demand (COD) from landfill leachate and generating electricity. The results show that COD removal efficiency is enhanced at higher concentrations of organic matter. The MFC exhibited the highest COD removal efficiency (89%) and maximum power density (339.41 mWm⁻²) at a COD concentration of 3325.0 mg L⁻¹.

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Coulombic efficiency25.5%

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What they did

System
MFC

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Abstract

Abstract Microbial fuel cells (MFCs), hailed as a promising technology, hold the potential to combat various wastewater pollutants while simultaneously converting their chemical energy into electricity through biocatalysts. This study explores the applicability of a dual compartment MFC (DC-MFC) under varying conditions, targeting the removal of chemical oxygen demand (COD) from landfill leachate and electricity generation. In this setup, anaerobic sludge from a wastewater treatment plant serves as the inoculum in the anode compartment of the MFC, with a Nafion117 membrane acting as the separator between MFC units. The cathode compartments are filled with distilled water and continually aerated for 24 h to enhance air supply. The study assesses the MFC’s performance across different COD concentrations, focusing on COD removal, power generation, and Coulombic efficiency. The findings reveal that COD removal efficiency is notably enhanced at higher concentrations of organic matter. Specifically, at a COD concentration of 3325.0 mg L −1 , the MFC exhibited the highest COD removal efficiency (89%) and maximum power density (339.41 mWm −2 ), accompanied by a Coulombic efficiency of 25.5%. However, as the initial substrate concentration increased to 3825 mg L −1 , the efficiency decreased to 72%, with a Coulombic efficiency of 13.56% and a power density of 262.34 mWm −2 . Optical density levels increased due to bacterial growth at ambient temperature and neutral pH, reflecting the dynamic microbial response within the system.

Key findings

  • COD removal efficiency is notably enhanced at higher concentrations of organic matter.
  • The MFC exhibited the highest COD removal efficiency (89%) and maximum power density (339.41 mWm⁻²) at a COD concentration of 3325.0 mg L⁻¹.
  • The study assesses the MFC's performance across different COD concentrations, focusing on COD removal, power generation, and Coulombic efficiency.

Keywords

Microbial fuel cellChemical oxygen demandFaraday efficiencyLeachateWastewaterAnode

Identifiers

DOI
10.1007/s11356-024-32090-x
Journal
Environmental Science and Pollution Research
Year
2024