Electricity producing property and bacterial community structure in microbial fuel cell equipped with membrane electrode assembly(ENVIRONMENTAL BIOTECHNOLOGY)
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概要
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It is important for practical use of microbial fuel cells (MFCs) to not only develop electrodes and proton exchange membranes but also to understand the bacterial community structure related to electricity generation. Four lactate fed MFCs equipped with different membrane electrode assemblies (MEAs) were constructed with paddy field soil as inoculum. The MEAs significantly affected the electricity-generating properties of the MFCs. MEA-I was made with Nafion 117 solution and the other MEAs were made with different configurations of three kinds of polymers. MFC-I equipped with MEA-I exhibited the highest performance with a stable current density of 55 ± 3 mA m^<-2>. MFC-III equipped with MEA-III with the highest platinum concentration, exhibited the lowest performance with a stable current density of 1.7 ± 0.1 mA m^<-2>. SEM observation revealed that there were cracks on MEA-III. These results demonstrated that it is significantly important to prevent oxygen-intrusion for improved MFC performance. By comparing the data of DGGE and phylogenetic analyzes, it was suggested that the dominant bacterial communities of MFC-I were constructed with lactate-fermenters and Fe(III)-reducers, which consisted of bacteria affiliated with the genera of Enterobacter, Dechlorosoma, Pelobacter, Desulfovibrio, Propioniferax, Pelosinus, and Firmicutes. A bacterium sharing 100% similarity to one of the DGGE bands was isolated from MFC-I. The 16S rRNA gene sequence of the isolate shared 98% similarity to grampositive Propioniferax sp. P7 and it was confirmed that the isolate produced electricity in an MFC. These results suggested that these bacteria are valuable for constructing the electron transfer network in MFC.
- 2013-07-00
著者
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Futamata Hiroyuki
Department Of Ecological Engineering Toyohashi University Of Technology
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Suzuki Kei
Department Of Hematology And Oncology Mie University Graduate School Of Medicine
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Yamamoto Shuji
Department Of Hematology And Oncology University Of Fukui
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SAKAMOTO Hisatoshi
Department of Environmental and Life Sciences, Toyohashi University of Technology
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MATSUDA Atsunori
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
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Rubaba Owen
Department of Material Sciences and Chemical Engineering, Shizuoka University
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Araki Yoko
Department of Material Sciences and Chemical Engineering, Shizuoka University
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Futamata Hiroyuki
Department of Material Sciences and Chemical Engineering, Shizuoka University
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Yamamoto Shuji
Department of Applied Chemistry, Yamanashi University
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Sakamoto Hisatoshi
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
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Araki Yoko
Department of Applied Chemistry and Biological Engineering, Graduate School of Engineering, Shizuoka University
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