Document Detail

Deflocculation of Activated Sludge by the Dissimilatory Fe(III)-Reducing Bacterium Shewanella alga BrY.
MedLine Citation:
PMID:  16535299     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The influence of microbial Fe(III) reduction on the deflocculation of autoclaved activated sludge was investigated. Fe(III) flocculated activated sludge better than Fe(II). Decreasing concentrations of Fe(III) caused an increase in sludge bulk water turbidity, while bulk water turbidity remained relatively constant over a range of Fe(II) concentrations. Cells of the dissimilatory metal-reducing bacterium Shewanella alga BrY coupled the oxidation of H(inf2) to the reduction of Fe(III) bound in sludge flocs. Cell adhesion to the Fe(III)-sludge flocs was a prerequisite for Fe(III) reduction. The reduction of Fe(III) in sludge flocs by strain BrY caused an increase in bulk water turbidity, suggesting that the sludge was deflocculated. The results of this study support previous research suggesting that microbial Fe(III) respiration may have an impact on the floc structure and colloidal chemistry of activated sludge.
F Caccavo; B Frolund; K F Van Ommen; P H Nielsen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  62     ISSN:  0099-2240     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  1996 Apr 
Date Detail:
Created Date:  2010-06-25     Completed Date:  2010-06-25     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1487-90     Citation Subset:  -    
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