Biofilm stratification during simultaneous nitrification and denitrification (SND) at a biocathode

Virdis, Bernardino, Read, Suzanne T., Rabaey, Korneel, Rozendal, Rene A., Yuan, Zhiguo and Keller, Jurg (2011) Biofilm stratification during simultaneous nitrification and denitrification (SND) at a biocathode. Bioresource Technology, 102 1: 334-341. doi:10.1016/j.biortech.2010.06.155


Author Virdis, Bernardino
Read, Suzanne T.
Rabaey, Korneel
Rozendal, Rene A.
Yuan, Zhiguo
Keller, Jurg
Title Biofilm stratification during simultaneous nitrification and denitrification (SND) at a biocathode
Journal name Bioresource Technology   Check publisher's open access policy
ISSN 0960-8524
1873-2976
Publication date 2011-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.biortech.2010.06.155
Open Access Status Not Open Access
Volume 102
Issue 1
Start page 334
End page 341
Total pages 8
Editor A. Pandey
C. Larroche
S. C. Ricke
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Abstract The aeration of the cathode compartment of bioelectrochemical systems (BESs) was recently shown to promote simultaneous nitrification and denitrification (SND). This study investigates the cathodic metabolism under different operating conditions as well as the structural organization of the cathodic biofilm during SND. Results show that a maximal nitrogen removal efficiency of 86.9 ± 0.5%, and a removal rate of 3.39 ± 0.08 mg N L−1 h−1 could be achieved at a dissolved oxygen (DO) level of 5.73 ± 0.03 mg L−1 in the catholyte. The DO levels used in this study are higher than the thresholds previously reported as detrimental for denitrification. Analysis of the cathodic half-cell potential during batch tests suggested the existence of an oxygen gradient within the biofilm while performing SND. FISH analysis corroborated this finding revealing that the structure of the biofilm included an outer layer occupied by putative nitrifying organisms, and an inner layer where putative denitrifying organisms were most dominant. To our best knowledge this is the first time that nitrifying and denitrifying microorganisms are simultaneously observed in a cathodic biofilm.
Keyword Bioelectrochemical systems
Denitrification
Cathodic process
Microbial fuel cell
Nitrification
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 24 July 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Advanced Water Management Centre Publications
 
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Created: Fri, 03 Sep 2010, 20:23:40 EST by Hong Lee on behalf of Advanced Water Management Centre