Document Detail

Effects of silver nanoparticles on microbial community structure in activated sludge.
MedLine Citation:
PMID:  23246663     Owner:  NLM     Status:  Publisher    
Due to the antimicrobial properties and the widespread use of Ag nanoparticles (NPs) in commercial products, the prevalent Ag NPs in waste streams can decrease the effectiveness of biological wastewater treatments. To determine the effects of Ag NPs on the complex microbial communities present in activated sludge, detailed knowledge of the Ag NPs toxicity on microorganism communities is necessary. Experiments were performed to determine the effects of 1mg/L Ag NPs on microbial communities in activated sludge. Activated sludge samples with and without gravity settling were compared to evaluate the impact of activated sludge flocs structure on the response of microbial communities to Ag NPs. The effects of Ag NPs on the entire microbial community in activated sludge were analyzed using 16S rRNA gene based polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). The results suggest that certain microbial species in the intact activated sludge were highly sensitive to Ag NPs treatment, although no reduction in cell culturability was detected through heterotrophic plate counts (HPCs) during the 24h Ag NPs treatment. Conversely, one log unit reduction in the HPCs with no microbial community structure changes was observed for unsettled activated sludge flocs (intact activated sludge treated by 3h gravity-settling) after 24h Ag NPs treatment. This study strongly suggests that Ag NPs can impact the activated sludge microbial community and cell culturability depending on the physical structure of the activated sludge flocs, the spatial distribution of microorganisms in activated sludge flocs, and the community structures in the activated sludge.
Xiaohui Sun; Zhiya Sheng; Yang Liu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-11
Journal Detail:
Title:  The Science of the total environment     Volume:  443C     ISSN:  1879-1026     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  828-835     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada T6G 2W2.
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