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    Effect of Electrode-Surface Area on Electricity Generation in Microbial Fuel Cells
    2015 ASABE International Meeting (2015)
    Owada MamiTakahiro YamashitaHiroshi YokoyamaAtsuo Ikeguchi
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    Abstract:
    Abstract. Microbial fuel cells (MFCs) are prospective biodevices for the purification and energy recovery from organic wastewater. In this study we examined the effect of surface areas of anode and cathode on electrical power output in MFCs. Hydrogen, produced by anaerobic bacteria, is one of the possible mediators for electricity generation in MFCs. A reactor consisted of an anode, air cathode, and proton-exchange membrane was filled with a phosphate buffer without inoculation of bacteria, and hydrogen gas as a fuel for electricity generation was dissolved in the buffer. The cathode contained Pt catalyst, but the anode did not it. When the surface areas of anode and cathode were changed from 6 to 25 cm2, the electrical power outputs were proportional to the cathode area but not to the anode area. To examine the electricity generation by bacterial, an artificial wastewater containing peptone and beef extract was filled in the reactor, and activated sludge was inoculated as the seed bacteria. The reactor was operated at room temperature over two months, and the electricity generation was monitored. The electrical power output by bacteria with regard to the change in the surface areas of anode and cathode showed a similar tendency to those with hydrogen in the absence of bacteria, i.e., it was dependent on only the cathode area. These results suggest that the power output of the MFC can be increased by enlarging the cathode area.
    Topics:
    Microbial Fuel Cells and Bioremediation
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    Arwa FraiwanSeokheun Choi
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    Microbial fuel cell consisting two main components which are anode and cathode materials. In the microbial fuel cell, both anode and cathode compartments are separated with a separator. Anode generates the protons and electrons while cathode converts protons into water with the presence electrons and oxygen. During the Microbial fuel cell operation, the performance of anode is very crucial due to it provides the protons and electrons. Hence, the high efficiency microbial fuel cell is very related with the high anode performance. This work addressed to the enrichment process of electroactive bacteria (EAB) in anode of microbial fuel cell. In this work, some parameters such as current generations, , and pH changes were used to assess the enrichment process of EAB was reached. In addition, the presence of EAB on the anode surface was identified based on the morphology of anode surface. The removal of COD and the pH value were determined by using the American public health analysis method and pH tester, respectively. The morphology of anode surface was analysed by using a scanning electron microscope. Whereas, current generation was tested by using a mustimeter. The removal of COD and final pH were obtained 71.4 % and 5.7, respectively. The optimum current generation was observed 0.19 mA. The surface morphology of anode before enriched with microbes was clear surface, while after enriched with microbes was attached by microbes. The removal of COD, pH changes, current generation and morphology of anode surface could be used to assess the EAB in the anode compartment. Keywords: Microbial fuel cell; anode; cathode; electroactive bacteria; pH changes.
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    Energy Sources Part A Recovery Utilization and Environmental Effects (2016)
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