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Influencing factors for output power density of microbial fuel cells using excess sludge from wastewater treatment plant as fuel |
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Abstract Some relevant factors which may affect output power density of the microbial fuel cell using excess sludge as fuel were studied. The volume of excess sludge had little effect on the output power density(per anode area)of fuel cell. The larger anode area of the cell made the output power density smaller. When using NaCl as an ionic additive, it had a corresponding increase in output power density with the increased dosage, and the maximum was 173.4mW/m2. But for the ionic additive K2HPO4, the output power density first increased and then decreased, which mainly due to the increase in phosphorus concentration would affect the microbial activity in the system. As the volume ratio of sludge to water equated 1:2, the maximum output power density was 163.35mW/m2, increasing dilution ratio or not would result in the reduction of output power density. When the distance between cathode and anode decreased from 5cm to 0.5cm, the output power density increased from 50.14mW/m2 to 84.02mW/m2, which illuminated the diffuseness of oxygen did not affect the anaerobic bacteria on anode. Finally, the output power density of microbial fuel cell with excess sludge as fuel was successfully raised to 256.12mW/m2 under optimal experimental conditions.
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Received: 26 May 2009
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