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KMID : 0364820120480040254
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Korean Journal of Microbiology
2012 Volume.48 No. 4 p.254 ~ p.261
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Analysis of Microbial Communities in Aquatic Sediment Microbial Fuel Cells Injected with Glucose
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Kim Min
Kalu I. Ekpeghere
Kim Soo-Hyeon
Jang Jae-Soo
Koh Sung-Cheol
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Abstract
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The purpose of this research was to optimize electric current production of sediment microbial fuel cells by injecting
glucose and to investigate its impact on microbial communities involved. It was shown that injection of proper
concentration of glucose could increase electric current generated from sediment microbial fuel cells. When 1,000
mg/L of glucose, as opposed to higher concentrations, was injected, electric current increased up to 3 times. This
increase is mainly attributed to the mutual relationship between fermenting bacteria and exoelectrogenic bacteria.
Here the organic acids generated by fermenting bacteria could be utilized by exoelectrogenic bacteria, removing
feedback inhibition caused by the organic acids. When glucose was injected, the population of Clostridium increased
as to ferment injected glucose. Glucose fermentation can have either a positive or negative effect on electric current
generation. When exoelectrogenic bacteria may readily utilize the end-product, electric current could increase.
However, when the end-product was not readily removed, then detrimental chemical reactions (pH decrease,
methane generation, organic acids accumulation) occurred: exoelctrogenic bacteria population declined and
non-microbial fuel cell related microorganisms prospered. By injecting a proper concentration of glucose, a mutual
relationship between fermenting bacteria, such as Clostridium, and exoelectrogenic bacteria, such as Geobacter,
should be fulfilled in order to increase electricity production in mixed cultures of microorganisms collected from the
aquatic sediments.
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KEYWORD
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Clostridium sp., exoelectrogenesis, fermentation, sediment microbial fuel cells (SMFC)
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