Microbial Fuel Cell as a Bioelectrochemical Sensor of Nitrite Ions
Arnas Klevinskas, Kristina Kantminienė, Nerita Žmuidzinavičienė, Ilona Jonuškienė +1
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82% confidenceThis study demonstrates a dual-chamber microbial fuel cell (MFC) employing Shewanella putrefaciens as a bioelectrochemical biosensor for real-time nitrite ion monitoring in wastewater. At low (0.01–0.1 mg·L⁻¹) and moderate (1.0–10 mg·L⁻¹) nitrite concentrations, MFC voltage drop exhibits linear dependence on the logarithm of nitrite concentration, enabling quantitative detection. At higher concentrations (100–1000 mg·L⁻¹), the sensor functions as an early warning device for extreme pollution. This approach offers a sustainable, cost-effective alternative to periodic laboratory sampling.
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Abstract
The deteriorating environmental quality requires a rapid in situ real-time monitoring of toxic compounds in environment including water and wastewater. One of the most toxic nitrogen-containing ions is nitrite ion, therefore, it is particularly important to ensure that nitrite ions are completely absent in surface and ground waters as well as in wastewater or, at least, their concentration does not exceed permissible levels. However, no selective ion electrode, which would enable continuous measurement of nitrite ion concentration in wastewater by bioelectrochemical sensor, is available. Microbial fuel cell (MFC)-based biosensor offers a sustainable low-cost alternative to the monitoring by periodic sampling for laboratory testing. It has been determined, that at low (0.01–0.1 mg·L⁻¹) and moderate (1.0–10 mg·L⁻¹) concentration of nitrite ions in anolyte-model wastewater, the voltage drop in MFC linearly depends on the logarithm of nitrite ion concentration of proving the potential of the application of MFC-based biosensor for the quantitative monitoring of nitrite ion concentration in wastewater and other surface water. Higher concentrations (100–1000 mg·L⁻¹) of nitrite ions in anolyte-model wastewater could not be accurately quantified due to a significant drop in MFC voltage. In this case MFC can potentially serve as a bioelectrochemical early warning device for extremely high nitrite pollution.
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- 2021