An assessment of the persistence of putative pathogenic bacteria in chloraminated water distribution systems.

Autor: Bal Krishna KC; School of Engineering, Western Sydney University, Locked Bag 1797, Penrith, NSW 2750, Australia. Electronic address: b.kc@westernsydney.edu.au., Sathasivan A; School of Engineering, Western Sydney University, Locked Bag 1797, Penrith, NSW 2750, Australia., Ginige MP; CSIRO Land and Water, Private Bag No. 5, Wembley, WA, 6913, Australia.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2021 Feb 15; Vol. 190, pp. 116677. Date of Electronic Publication: 2020 Nov 27.
DOI: 10.1016/j.watres.2020.116677
Abstrakt: This study investigated how a chloramine loss and nitrifying conditions influenced putative pathogenic bacterial diversity in bulk water and biofilm of a laboratory- and a full-scale chloraminated water distribution systems. Fifty-four reference databases containing full-length 16S rRNA gene sequences obtained from the National Centre for Biotechnology Information database were prepared to represent fifty-four pathogenic bacterial species listed in the World Health Organisation and Australian Drinking Water Quality Guidelines. When 16S rRNA gene sequences of all samples were screened against the fifty-four reference pathogenic databases, a total of thirty-one putative pathogenic bacteria were detected in both laboratory- and full-scale systems where total chlorine residuals ranged between 0.03 - 2.2 mg/L. Pathogenic bacterial species Mycolicibacterium fortuitum and Pseudomonas aeruginosa were noted in all laboratory (i.e. in bulk water and biofilm) and in bulk water of full-scale samples and Mycolicibacterium fortuitum dominated when chloramine residuals were high. Other different pathogenic bacterial species were observed dominant with decaying chloramine residuals. This study for the first time reports the diverse abundance of putative pathogenic bacteria resilient towards chloramine and highlights that metagenomics surveillance of drinking water can serve as a rapid assessment and an early warning of outbreaks of a large number of putative pathogenic bacteria.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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