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Analysis of Microbial Communities in Aquatic Sediment Microbial Fuel Cells Injected with Glucose

포도당을 주입한 수중퇴적물을 이용한 연료전지시스템에 있어서 미생물군집 분석

  • Kim, Min (Chumgshim International High School) ;
  • Ekpeghere, Kalu I. (Department of Environmental Engineering, Korea Maritime University) ;
  • Kim, Soo-Hyeon (Department of Environmental Engineering, Korea Maritime University) ;
  • Chang, Jae-Soo (Department of Environmental Engineering, Korea Maritime University) ;
  • Koh, Sung-Cheol (Department of Environmental Engineering, Korea Maritime University)
  • 김민 (청심국제고등학교) ;
  • ;
  • 김수현 (한국해양대학교 환경공학과) ;
  • 장재수 (한국해양대학교 환경공학과) ;
  • 고성철 (한국해양대학교 환경공학과)
  • Received : 2012.12.12
  • Accepted : 2012.12.26
  • Published : 2012.12.31

Abstract

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.

Keywords

Clostridium sp.;exoelectrogenesis;fermentation;sediment microbial fuel cells (SMFC)

Acknowledgement

Supported by : National Research Foundation

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