Syntrophic processes drive the conversion of glucose in microbial fuel cell anodes

Freguia, Stefano, Rabaey, Korneel, Yuan, Zhiguo and Keller, Jurg (2008) Syntrophic processes drive the conversion of glucose in microbial fuel cell anodes. Environmental Science & Technology, 42 21: 7937-7943. doi:10.1021/es800482e


Author Freguia, Stefano
Rabaey, Korneel
Yuan, Zhiguo
Keller, Jurg
Title Syntrophic processes drive the conversion of glucose in microbial fuel cell anodes
Journal name Environmental Science & Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2008-11-01
Year available 2008
Sub-type Article (original research)
DOI 10.1021/es800482e
Open Access Status Not yet assessed
Volume 42
Issue 21
Start page 7937
End page 7943
Total pages 7
Place of publication Washington, D. C.
Publisher American Chemical Society
Language eng
Subject C1
9699 Other Environment
090409 Wastewater Treatment Processes
Abstract Microbial fuel cell (MFC) anodes are anaerobic bioreactors. Processes such as fermentations and methanogenesis are likely competitors to electricity generation. This work studied the pathway of glucose conversion in continuous microbial fuel cell anodes with an adapted bacterial community. The study revealed that the majority of glucose is first fermented to hydrogen and acetate. Both are then used as substrates for bacterial electricity generation. When methanogens are present, methane production occurs at a rate that slightly increases with the current Methanogenesis and electricity generation compete for hydrogen, causing increased fermentation rates. In a rather young anodic biofilm on granular graphite, methanogenesis can be suppressed by aerating the anode compartment for one hour. Only short-term inhibition can be achieved applying the same technique on a well established biofilm on granular graphite. This study shows that fermentative processes are not detrimental to current generation, and that direct oxidation of glucose does not play a major role in mixed population conversions in a MFC anode.
Formatted abstract
Microbial fuel cell (MFC) anodes are anaerobic bioreactors. Processes such as fermentations and methanogenesis are likely competitors to electricity generation.

This work studied the pathway of glucose conversion in continuous microbial fuel cell anodes with an adapted bacterial community. The study revealed that the majority of glucose is first fermented to hydrogen and acetate. Both are then used as substrates for bacterial electricity generation. When methanogens are present, methane production occurs at a rate that slightly increases with the current. Methanogenesis and electricity generation compete for hydrogen, causing increased fermentation rates. In a rather young anodic biofilm on granular graphite, methanogenesis can be suppressed by aerating the anode compartment for one hour. Only short-term inhibition can be achieved applying the same technique on a well established biofilm on granular graphite.

This study shows that fermentative processes are not detrimental to current generation, and that direct oxidation of glucose does not play a major role in mixed population conversions in a MFC anode.
Keyword ELECTRICITY-GENERATION
ELECTRON-TRANSFER
NANOWIRES
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0666927
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 16 Apr 2009, 18:10:19 EST by Suzanne Read on behalf of Advanced Water Management Centre