Document Detail

Effect of bulk liquid BOD concentration on activity and microbial community structure of a nitrifying, membrane-aerated biofilm.
MedLine Citation:
PMID:  18813923     Owner:  NLM     Status:  MEDLINE    
Membrane-aerated biofilms (MABs) are an effective means to achieve nitrification and denitrification of wastewater. In this research, microsensors, fluorescence in situ hybridization (FISH), and modeling were used to assess the impact of bulk liquid biological oxygen demand (BOD) concentrations on the activity and microbial community structure of nitrifying MABs. With 1 g m(-3) BOD in the bulk liquid, the nitrification rate was 1.3 g N m(-2) day(-1), slightly lower than the 1.5 g N m(-2) day(-1) reported for no bulk liquid BOD. With bulk liquid BOD concentrations of 3 and 10 g m(-3), the rates decreased to 1 and 0.4 g N m(-2) day(-1), respectively. The percent denitrification increased from 20% to 100% when the BOD increased from 1 to 10 g m(-3) BOD. FISH results indicated increasing abundance of heterotrophs with increasing bulk liquid BOD, consistent with the increased denitrification rates. Modeling was used to assess the effect of BOD on nitrification rates and to compare an MAB to a conventional biofilm. The model-predicted nitrification rates were consistent with the experimental results. Also, nitrification in the MAB was much less sensitive to BOD inhibition than the conventional biofilm. The MAB achieved concurrent nitrification and denitrification, whereas little denitrification occurred in the conventional biofilm.
Leon S Downing; Robert Nerenberg
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Publication Detail:
Type:  Journal Article     Date:  2008-09-24
Journal Detail:
Title:  Applied microbiology and biotechnology     Volume:  81     ISSN:  1432-0614     ISO Abbreviation:  Appl. Microbiol. Biotechnol.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-22     Completed Date:  2008-11-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8406612     Medline TA:  Appl Microbiol Biotechnol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  153-62     Citation Subset:  IM    
Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA.
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MeSH Terms
Bacteria / genetics,  metabolism*
Bioreactors / microbiology
In Situ Hybridization, Fluorescence
Models, Biological
Nitrites / metabolism*
Oxygen / metabolism*
Reg. No./Substance:
0/Nitrites; 7782-44-7/Oxygen

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

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