The study of the performance of a biological fuel cell: A progress towards the improvement of low electrical bioenergy output by using an amplification system

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Abstract A microbial fuel cell (MFC) has been conceived and constructed for the treatment of the sheep manure wastes and conversion them into clean sustainable renewable energy. The chemical oxygen demand (COD) removal of 10 days running MFC increased by 58.7% showing simultaneously an increase in the cell voltage. However, this MFC technology faces practical barriers since it produces low electric energy. A power management system including the MFC, operational amplifier, solar photovoltaic panel and a boost DC/DC converter, was elaborated in this respect. The low voltage output obtained from the MFC, was thus substantially increased by the amplifier prior to polarization by a photovoltaic module with solar radiation. The amplified voltage was thus sufficiently enough and in consequence, utilized to feed a light emitting diode. The low output voltage 0.5 V was simply harvested, successfully boosted up to approximately 2 V (i.e. 4 times higher) and effectively harnessed as a power supply. This novel application is very interesting to utilize the natural bioenergy contained in wastes to supply small electronic devices.

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