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A microbial fuel cell (MFC) biosensor was developed for rapid BOD determination in water, with monosaccharides as good fuel and methionine, phenylalanine, and ethanol as poor fuels. The MFC performance was not significantly affected by ions in the influent, but CN− could alleviate the effect of antagonistic electron acceptors. The developed MFC biosensor has great potential as an alternative tool for BOD measurements.

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What they did

System
MFC
Substrate
pure compound

What worked

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Abstract

The conventional Biochemical Oxygen Demand (BOD) method takes five days to analyze samples. A microbial fuel cell (MFC) may be an alternate tool for rapid BOD determination in water. However, a MFC biosensor for continuous BOD measurements of water samples is still unavailable. In this study, a MFC biosensor inoculated with known mixed cultures was used to determine the BOD concentration. Effects of important parameters on establishing a calibration curve between the BOD concentration and output signal from the MFC were evaluated. The results indicate monosaccharides were good fuel, and methionine, phenylalanine, and ethanol were poor fuels for electricity generation by the MFC. Ions in the influent did not significantly affect the MFC performance. CN− in the influent could alleviate the effect of antagonistic electron acceptors on the MFC performance. The regression equation for BOD concentration and current density of the biosensor was y = 0.0145x + 0.3317. It was adopted to measure accurately and continuously the BOD concentration in actual water samples at an acceptable error margin. These results clearly show the developed MFC biosensor has great potential as an alternative BOD sensing device for online measurements of wastewater BOD.

Key findings

  • Monosaccharides were found to be good fuels for electricity generation by the MFC.
  • Methionine, phenylalanine, and ethanol were found to be poor fuels for electricity generation by the MFC.
  • Ions in the influent did not significantly affect the MFC performance.
  • CN− in the influent could alleviate the effect of antagonistic electron acceptors on the MFC performance.

Keywords

Microbial fuel cellBiosensorBiochemical oxygen demandChemical oxygen demandFuel cellsOxygen

Identifiers

DOI
10.3390/s16010035
Journal
Sensors
Year
2015