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This MFC study Dual-chamber microbial fuel cells (MFCs) were established to study the effect of seed sludge, carbon sources, buffering solution and stirring on power generation performance. Scanning electron microscope (SEM) and polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) technologies were used to investigate the spatial distribution characteristics of bacterial community.

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What they did

System
MFC

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Abstract

Dual-chamber microbial fuel cells (MFCs) were established to study the effect of seed sludge, carbon sources, buffering solution and stirring on power generation performance. Scanning electron microscope (SEM) and polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) technologies were used to investigate the spatial distribution characteristics of bacterial community. The results showed that the MFC feeding with lactic acid obtained 0.57V of electromotive force, and 1.57 W/m 3 of volumetric power density. It reached 0.62V and 2.07 W/m 3 when the carbon source was changed to acetic acid. Compared with anaerobic sludge, aerobic sludge had higher maximum voltage and longer high voltage duration. The stirring and the adding buffer solution improved electricity generation. SEM and DGGE profiles indicated that a large number of bacilli were tightly bound to the anode surface. Microbial community structure on the membrane surface was more similar to suspended sludge than sediment and seed sludge. In conclusion, MFCs perform better with incubating aerobic sludge, feeding acetic acid, adding PBS buffer (50mmol/L) and stirring.

Key findings

  • The results showed that the MFC feeding with lactic acid obtained 0.
  • 57 W/m³ of volumetric power density.
  • It reached 0.
  • 07 W/m³ when the carbon source was changed to acetic acid.
  • The stirring and the adding buffer solution improved electricity generation.

Keywords

Microbial fuel cellAcetic acidAnodeElectromotive forceScanning electron microscopeActivated sludge

Identifiers

DOI
10.4028/www.scientific.net/amr.724-725.762
Journal
Advanced Materials Research
Year
2013