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Verjesh Kumar Magotra, Sunil Kumar, T W Kang, Akbar I Inamdar +6
This study demonstrates a novel compost soil microbial fuel cell (CSMFC) using urea as fuel and graphite electrodes. The system exploits natural soil bacteria and enzymes to oxidize urea through nitrification and denitrification pathways, generating electricity without the safety and handling concerns of liquid-state MFCs. Optimal performance was achieved at 0.5 g/ml urea concentration, yielding 3.16 mW/m² power density with stable operation over 140 hours and 500 electrochemical cycles.
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The acute problem of eutrophication increasing in the environment is due to the increase of industrial wastewater, synthetic nitrogen, urine, and urea. This pollutes groundwater, soil and creates a danger to aquatic life. Therefore, it is advantageous to use these waste materials in the form of urea as fuel to generate power using Microbial Fuel Cell (MFC). In this work, we studied the compost soil MFC(CSMFC) unlike typical MFC with urea from the compost as fuel and graphite as a functional electrode. The electrochemical techniques such as Cyclic Voltammetry, Chronoamperometry are used to characterise CSMFC. It is observed that the CSMFC in which the compost consists of urea concertation of 0.5 g/ml produces maximum power. Moreover, IV measurement is carried out using polarization curves in order to study its sustainability and scalability. Bacterial studies were also playing a significant role in power generation. The sustainability study revealed that urea is consumed in CSMFC to generate power. This study confirmed that urea has a profound effect on the power generation from the CSMFC. Our focus is to get power from the soil processes in future by using waste like urine, industrial wastewater, which contains much amount of urea.