Trends in Green Chemistry Open Access

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Bio-energy from waste paw-paw fruits and peels using single microbial fuel cells

Kalagbor Ihesinachi A

Most of the energy around the world comes from non-renewable sources, including coal, petroleum, oil and natural gases. Microbial fuel cells are an alternative source of generating electricity using microorganisms on biomass. Paw-paw is an example of biomass and commonly known as papaya fruit. It contains sugar and other ingredients with sufficient chemical energy that can be converted  into electrical energy by means of redox reaction. The generation of electricity from waste pawpaw fruits and peels using microbial fuel cells, is one of the approach to meet the population demand for energy. The conversion of waste pawpaw into electricity would not only produce electricity but will also serve as one of the  means of recycling waste that is causing environmental pollution. The graphite used for the electrodes we obtained from waste finger batteries. The results obtained from this research shows that the voltage and current produced from the 20 kg paw-paw waste was capable of lighting a 2V bulb. The decrease in voltage and current with time was as a result of decrease in the organic matter contents of the substrate used. The dissolved Oxygen (DO).

Biochemical oxygen Demand (BOD) and Chemical Oxygen Demand (COD) decreased with increase in the duration of the of energy production. It has therefore shown that this fruit waste can be used to generate electricity. It is therefore recommended that more study should be carried out on production of electricity from fruit waste.