Document Detail


Effect of nitrate on the performance of single chamber air cathode microbial fuel cells.
MedLine Citation:
PMID:  18822442     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of nitrate on the performance of a single chamber air cathode MFC system and the denitrification activity in the system were investigated. The maximum voltage output was not affected by 8.0mM nitrate in the medium solution at higher external resistance (270-1000Omega), but affected at lower resistance (150Omega) possibly due to the low organic carbon availability. The Coulombic efficiency was greatly affected by the nitrate concentration possibly due to the competition between the electricity generation and denitrification processes. Over 84-90% of nitrate (0.8-8.0mM) was removed from the single chamber MFCs in less than 8h in the first batch. After 4-month operation, over 85% of nitrate (8.0mM) was removed in 1h after the MFC was continuously fed with a medium solution containing nitrate. Only a small amount of nitrite (<0.01mM) was detected during the denitrification process. The similar denitrification activity observed at different external resistances (1000 and 270Omega) and open circuit mode indicates that the denitrification was not significantly affected by the electricity generation process. No electricity was generated when the MFC fed with 8.0mM nitrate was moved to a glove box (no oxygen), indicating that the bacteria on the cathode did not involve in accepting electrons from the circuit to reduce the nitrate. Denaturing Gradient Gel Electrophoresis (DGGE) profiles demonstrate a similar bacterial community composition on the electrodes and in the solution but with different dominant species.
Authors:
Chontisa Sukkasem; Shoutao Xu; Sunhwa Park; Piyarat Boonsawang; Hong Liu
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-09-11
Journal Detail:
Title:  Water research     Volume:  42     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-10     Completed Date:  2009-01-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  4743-50     Citation Subset:  IM    
Affiliation:
Department of Biological and Ecological Engineering, Oregon State University, Corvallis, OR 97331, USA.
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MeSH Terms
Descriptor/Qualifier:
Bacteria / genetics,  metabolism*
Base Sequence
DNA Primers
Electrodes*
Electrophoresis, Polyacrylamide Gel
Nitrates / metabolism*
Oxygen / metabolism
Polymerase Chain Reaction
Chemical
Reg. No./Substance:
0/DNA Primers; 0/Nitrates; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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