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Enhancement of electricity production in a mediatorless air-cathode microbial fuel cell using Klebsiella sp IR21
- Enhancement of electricity production in a mediatorless air-cathode microbial fuel cell using Klebsiella sp IR21
- Lee, Yun-Yeong; Kim, Tae Gwan; Cho, Kyung-suk
- Ewha Authors
- 조경숙; 김태관
- SCOPUS Author ID
- Issue Date
- Journal Title
- BIOPROCESS AND BIOSYSTEMS ENGINEERING
- 1615-7591; 1615-7605
- vol. 39, no. 6, pp. 1005 - 1014
- Klebsiella sp.; Iron-reducing bacteria; Microbial fuel cells; Biocatalyst; Electricity
- SCI; SCIE; SCOPUS
- A novel dissimilatory iron-reducing bacteria, Klebsiella sp. IR21, was isolated from the anode biofilm of an MFC reactor. Klebsiella sp. IR21 reduced 27.8 % of ferric iron to ferrous iron demonstrating that Klebsiella sp. IR21 has electron transfer ability. Additionally, Klebsiella sp. IR21 generated electricity forming a biofilm on the anode surface. When a pure culture of Klebsiella sp. IR21 was supplied into a single chamber, air-cathode MFC fed with a mixture of glucose and acetate (500 mg L-1 COD), 40-60 mV of voltage (17-26 mA m(-2) of current density) was produced. Klebsiella sp. IR21 was also utilized as a biocatalyst to improve the electrical performance of a conventional MFC reactor. A single chamber, air-cathode MFC was fed with reject wastewater (10,000 mg L-1 COD) from a H-2 fermentation reactor. The average volt-age, current density, and power density were 142.9 +/- 25.74 mV, 60.5 +/- 11.61 mA m(-2), and 8.9 +/- 3.65 mW m(-2), respectively, in the MFC without inoculation of Klebsiella sp. IR21. However, these electrical performances of the MFC were significantly increased to 204.7 +/- 40.24 mV, 87.5 +/- 17.20 mA m(-2), and 18.6 +/- 7.23 mW m(-2), respectively, with inoculation of Klebsiella sp. IR21. The results indicate that Klebsiella sp. IR21 can be utilized as a biocatalyst for enhancement of electrical performance in MFC systems.
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