Removal of volatile fatty acids (VFA) by microbial fuel cell with aluminum electrode and microbial community identification with 16S rRNA sequence

Chang Moon Jeong; Jin Dal Rae Choi; Yeonghee Ahn; Ho Nam Chang

Korean Journal of Chemical Engineering, Vol.25, No.3, 535-541, May, 2008

DOI10.1007/s11814-008-0090-6 Export Citation

Removal of volatile fatty acids (VFA) by microbial fuel cell with aluminum electrode and microbial community identification with 16S rRNA sequence

Chang Moon Jeong, Jin Dal Rae Choi, Yeonghee Ahn¹, and Ho Nam Chang^†

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahang-no, Yuseong-gu, Daejeon 305-701, Korea
¹Department of Environmental Engineering, Dong-A University, 840 Hadan2-dong, Saha-gu, Busan 614-753, Korea

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Removal of volatile fatty acids in anaerobic digestion of organic wastes can accelerate eventual decomposition of organic wastes to CO2 and H2O using a recovery of electric energy by a microbial fuel cell. The fuel cell anode chamber was a 10 cm (I.D.)×20 cm long cylindrical Plexiglass having an ion ceramic cylinder separator (I.D.10 mm, O.D.12 mm, 0.3 μm average pore size). The aluminum foil cathode (12 cm2 surface area) was located inside the ceramic cylinder. Between the two cylinders, 1 liter of activated carbon particles was packed as anode electrode having a void fraction of 0.4. This fuel cell was connected to a 5 liter bioreactor (working volume 1.5 liter), and the bioreactor was run in batch mode by re-circulating a synthetic wastewater of 5 g/L glucose. Maximum TVFA (total volatile fatty acids) and SCOD (soluble chemical oxygen demand) removal rate were 3.79 g/L·day, 5.88 g/L·day, respectively. TVFA removal efficiency (92.7%) and SCOD removal efficiency (94.7%) under maximum current density operation were higher than the operation with maximum power density. In acid fermentation, butyric acid concentration was highest because Clostridium butyricum was a dominant microbial communitiy in the inoculum. The microbial cells collected from the anode bio-film samples were affiliated with Bacillus cereus based on the nucleotide sequences of dominant DGGE (denaturing gradient gel electrophoresis) bands.

Keywords:Microbial Fuel Cell;Acidogenesis;Fermentation;Organic Acid;DGGE

[References]

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