Electricity generation coupled to oxidation of propionate in a microbial fuel cell
- Electricity generation coupled to oxidation of propionate in a microbial fuel cell
- Jae Kyung Jang; In Seop Chang; Hwa Yeon Hwang; Yeng Fung Choo; JiYoung Lee; Kyung Suk Cho; 김병홍; Kenneth H. Nealson
- Bacterial community; Electricity generation; Microbial fuel cell (MFC); Propionate; 16S rDNA
- Issue Date
- Biotechnology letters
- VOL 32, NO 1, 79-85
- Propionate was used as fuel to enrich an
electrochemically-active microbial consortium in a
microbial fuel cell, and the bacterial consortium was
analyzed by culture-independent methods including
denaturing gradient gel electrophoresis (DGGE) of
the 16S rDNA, and by fluorescent in situ hybridization
(FISH). MFCs fed with propionate produced a current
of 4.88 ± 0.1 mA stably on 100 mg propionate/l as
COD within 3 weeks of the enrichment. When the
MFCs were fed with H2-saturated fuel containing
propionate, the current dropped to 3.82 ± 0.07 mA.
The maximum current generated was up to 8.8 mA
when MFCs were fed with 200 mg propionate/l as
COD. The DGGE of 16S rDNA showed that propionate-
enriched MFCs have a different bacterial population
from that enriched with acetate and from the
inoculum used for enrichment. The major member
(42%) of the consortium was an unidentified bacterium
followed by γ, β, and δ-proteobacteria.
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