Reduced Efficiency of Chlorine Disinfection of Naegleria fowleri in a Drinking Water Distribution Biofilm.
Identifieur interne : 002743 ( PubMed/Checkpoint ); précédent : 002742; suivant : 002744Reduced Efficiency of Chlorine Disinfection of Naegleria fowleri in a Drinking Water Distribution Biofilm.
Auteurs : Haylea C. Miller [Australie] ; Jason Wylie [Australie] ; Guillaume Dejean [Australie] ; Anna H. Kaksonen [Australie] ; David Sutton [Australie] ; Kalan Braun [Australie] ; Geoffrey J. Puzon [Australie]Source :
- Environmental science & technology [ 1520-5851 ] ; 2015.
Descripteurs français
- KwdFr :
- MESH :
- microbiologie : Eau de boisson.
- pharmacologie : Chlore, Désinfectants.
- Alimentation en eau, Biofilms, Désinfection, Microbiologie de l'eau, Naegleria fowleri, Viabilité microbienne.
English descriptors
- KwdEn :
- MESH :
- chemical , microbiology : Drinking Water.
- chemical , pharmacology : Chlorine, Disinfectants.
- drug effects : Biofilms, Microbial Viability, Naegleria fowleri.
- Disinfection, Water Microbiology, Water Supply.
Abstract
Naegleria fowleri associated with biofilm and biological demand water (organic matter suspended in water that consumes disinfectants) sourced from operational drinking water distribution systems (DWDSs) had significantly increased resistance to chlorine disinfection. N. fowleri survived intermittent chlorine dosing of 0.6 mg/L for 7 days in a mixed biofilm from field and laboratory-cultured Escherichia coli strains. However, N. fowleri associated with an attached drinking water distribution biofilm survived more than 30 times (20 mg/L for 3 h) the recommended concentration of chlorine for drinking water. N. fowleri showed considerably more resistance to chlorine when associated with a real field biofilm compared to the mixed laboratory biofilm. This increased resistance is likely due to not only the consumption of disinfectants by the biofilm and the reduced disinfectant penetration into the biofilm but also the composition and microbial community of the biofilm itself. The increased diversity of the field biofilm community likely increased N. fowleri's resistance to chlorine disinfection compared to that of the laboratory-cultured biofilm. Previous research has been conducted in only laboratory scale models of DWDSs and laboratory-cultured biofilms. To the best of our knowledge, this is the first study demonstrating how N. fowleri can persist in a field drinking water distribution biofilm despite chlorination.
DOI: 10.1021/acs.est.5b02947
PubMed: 26287820
Affiliations:
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pubmed:26287820Le document en format XML
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<front><div type="abstract" xml:lang="en">Naegleria fowleri associated with biofilm and biological demand water (organic matter suspended in water that consumes disinfectants) sourced from operational drinking water distribution systems (DWDSs) had significantly increased resistance to chlorine disinfection. N. fowleri survived intermittent chlorine dosing of 0.6 mg/L for 7 days in a mixed biofilm from field and laboratory-cultured Escherichia coli strains. However, N. fowleri associated with an attached drinking water distribution biofilm survived more than 30 times (20 mg/L for 3 h) the recommended concentration of chlorine for drinking water. N. fowleri showed considerably more resistance to chlorine when associated with a real field biofilm compared to the mixed laboratory biofilm. This increased resistance is likely due to not only the consumption of disinfectants by the biofilm and the reduced disinfectant penetration into the biofilm but also the composition and microbial community of the biofilm itself. The increased diversity of the field biofilm community likely increased N. fowleri's resistance to chlorine disinfection compared to that of the laboratory-cultured biofilm. Previous research has been conducted in only laboratory scale models of DWDSs and laboratory-cultured biofilms. To the best of our knowledge, this is the first study demonstrating how N. fowleri can persist in a field drinking water distribution biofilm despite chlorination.</div>
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