Waste Water Treatment And Electricity Generation Using The Anaerobic Fluidized Bed Microbial Fuel Cell

Anaerobic fluidized bed microbial fuel cell (MFC), (0.04 m in diameter and 0.6 m in height), was employed to investigate the effect of the fluidization behaviors on the electrogenesis capacity of MFC. Waste water and active carbon were used as liquid and solid phase respectively. The fuel cell was started up successfully using anaerobic activated sludge as inoculums. The initial generating voltage was amount to 200 mV, sharply increased 700mV after 80 h, and 700-900 mV was obtained 100 h later. The results of polarization curve and power density-current curve indicated that, the power density increased with the increasing of circular liquid velocity in fixed bed MFC. The vertex power density was achieved to 220 mW·m-3 when the active carbon was fluidized in the MFC, which was 120 mW·m-3 in fixed bed. A series of experiments indicated that, the electrogenesis capacity was improved in fluidized bed MFC, which attributes to the improving of the mass transfer effect and the increasing of reaction rate in fluidized bed MFC.The anaerobic fluidized bed membren-less microbial fuel cell (MFC) with 40 mm in diameter and 600 mm in height was employed to investigate the effect of the fluidization parameters on the electrogenesis capacity of MFC. Waste water and active carbon were used as liquid and solid phase respectively. The fuel cell was started up successfully using anaerobic activated sludge as inoculums. In fluidized bed MFC, the power density was increased to 450 mW·m-2 and then decreased quickly with the increasing of circular liquid velocity. Whereas, the internal resistance is decreased first, and then increased with increasing superficial velocity of wastewater. Furthermore, effect of cathode position of fluidized bed MFC was also investigated in this test. The cathode at 300 mm above distributor has a higher electrogenisis capacity than at 150 mm above distributor.Anaerobic fluidized bed microbial fuel cell (MFC), (40 mm in diameter and 600 mm in height), was employed to investigate the effect of the fluidization bed expansion on the electrogenesis capacity of MFC. Waste water and active carbon were used as liquid and solid phase respectively. There were three different cathode positions were investigated: NO.1 (150 mm above distributor), NO.2(250 mm above distributor) and NO.3(350 mm above distributor). Polarization curve and power density-current curve indicated that, the power density and voltage decreased with the cathode position decreasing along the bed height when the bed expansion is less than 170 mm While the maximum values were obtained at NO.2. when the bed expansion is less than 270 mm. For the conditions of bed expansion was higher than 270 mm but less than 360 mm, the power density and voltage increased with the cathode position along the bed height.