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Electricity-generating bacteria isolated from oily sludge MFCs exhibit optimal performance at a nitrogen-to-phosphorus ratio of 5.67:1, temperature of 25°C, and pH of 7.5, achieving a maximum voltage of 143.01 mV and power density of 65 mW/m³.

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What they did

System
MFC

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Abstract

Abstract Electricity‐generating bacteria are used as the biocatalysts of microbial fuel cells (MFCs). The power‐generating properties of electricity‐generating bacteria play an important role in organic matter degradation and electricity generation of MFCs. However, there are few electricity‐producing bacteria isolated from the anode biofilm of microbial fuel cells containing oily sludge. More importantly, the adaptability of nitrogen‐to‐phosphorus ratio, temperature and pH of the electricity‐generating bacteria were adjusted by controlled variable method. The results of this study showed that the isolated electricity‐producing bacteria ( Citrobacter freundii ) with a rod‐shaped cell, wrinkled surface, about 0.5–1.0 μm in length. The optimal nitrogen‐to‐phosphorus ratio, temperature and pH of MFCs are 5.67:1, 25°C, and pH = 7.5, Its maximum voltage and power density was up to 143.01 mV and 65 mW·m −3 , respectively. Furthermore, the growth rate of the electricity‐producing bacteria is the highest. This lays the foundation for inoculating electricity‐generating bacteria into oily sludge MFCs to improve the oil removal and power generation performance.

Key findings

  • Optimal nitrogen-to-phosphorus ratio for electricity-generating bacteria is 5.67:1.
  • Maximum voltage achieved is 143.01 mV.
  • Maximum power density achieved is 65 mW/m³.

Keywords

Microbial fuel cellBacteriaElectricity generationPulp and paper industryElectricityPhosphorus

Identifiers

DOI
10.1002/ep.14075
Journal
Environmental Progress & Sustainable Energy
Year
2023