Population diversity in model potable water biofilms receiving chlorine or chloramine residual

Biofouling
Margaret M WilliamsMark C Meckes

Abstract

Most water utilities use chlorine or chloramine to produce potable water. These disinfecting agents react with water to produce residual oxidants within a water distribution system (WDS) to control bacterial growth. While monochloramine is considered more stable than chlorine, little is known about the effect it has on WDS biofilms. Community structure of 10-week old WDS biofilms exposed to disinfectants was assessed after developing model biofilms from unamended distribution water. Four biofilm types were developed on polycarbonate slides within annular reactors while receiving chlorine, chloramine, or inactivated disinfectant residual. Eubacteria were identified through 16S rDNA sequence analysis. The model WDS biofilm exposed to chloramine mainly contained Mycobacterium and Dechloromonas sequences, while a variety of alpha- and additional beta-proteobacteria dominated the 16S rDNA clone libraries in the other three biofilms. Additionally, bacterial clones distantly related to Legionella were found in one of the biofilms receiving water with inactivated chlorine residual. The biofilm reactor receiving chloraminated water required increasing amounts of disinfectant after 2 weeks to maintain chlorine residual. In contrast, free...Continue Reading

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Jun 23, 2009·Applied and Environmental Microbiology·Heather A O'ConnellEugene W Rice
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Datasets Mentioned

BETA
AY957886
AY957950
AY957887
AY957888
AY957889

Methods Mentioned

BETA
dissecting
electrophoresis
PCR

Software Mentioned

PAUP *
ClustalW
Sequencher
BLASTn

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