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Environmental Science. 2014, (10) Core

Isolation and Identification of Electrochemically Active Microorganism from Micro-Aerobic EnvironmentChinese Full Text

WU Song;XIAO Yong;ZHENG Zhi-yong;ZHENG Yue;YANG Zhao-hui;ZHAO Feng;Key Laboratory of Environmental Biology and Pollution Control,Ministry of Education,College of Environmental Science and Engineering,Hunan University;Institute of Urban Environment,Chinese Academy of Sciences;

Abstract: Extracellular electron transfer of electrochemically active microorganism plays vital role in biogeochemical cycling of metals and carbon and in biosynthesis of bioenergy. Compared to anaerobic anode,micro-aerobic anode captures more energy from microbial fuel cell. However,most of previous researches focused on functioning bacteria in anaerobic anode,functioning bacteria in microaerobic anode was rarely studied. Herein,we used the traditional aerobic screening technology to isolate functioning bacteria from a micro-aerobic anode. Three pure cultures Aeromonas sp. WS-XY2,Citrobacter sp. WS-XY3 and Bacterium strain WS-XY4 were obtained. WS-XY2 and WS-XY3 were belonged to Proteobacteria,whereas WS-XY4 was possibly a new species. Cyclic voltammetry and chronoamperometry analysis demonstrated all of them showed the electrochemical activity by direct extracellular electron transfer,and micro-aerobic anode could select bacteria that have similar electrochemical activity to proliferate on the anode. We further conclude that functioning bacteria in micro-aerobic anode are more efficient than that of anaerobic anode may be the reason that micro-aerobic anode has better performance than anaerobic anode. Therefore,a thorough study of functioning bacteria in micro-aerobic anode will significantly promote the energy recovery from microbial fuel cell.
Keywords：

electrochemically active microorganism; microbial fuel cell; micro-aerobic anode; cyclic voltammetry; chronoamperometry;

  • DOI：

    10.13227/j.hjkx.2014.10.041

  • Series：

  • Subject：

  • Classification Code：

    X172

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