Implications of Climate Change: How Does Increased Water Temperature Influence Biofilm and Water Quality of Chlorinated Drinking Water Distribution Systems?
Temperature variation can promote physico-chemical and microbial changes in the water transported through distribution systems and influence the dynamics of biofilms attached to pipes, thus contributing to the release of pathogens into the bulk drinking water. An experimental real-scale chlorinated...
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| Vydané v: | Frontiers in microbiology Ročník 12; s. 658927 |
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| Hlavní autori: | , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
Frontiers Media S.A
08.06.2021
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| Predmet: | |
| ISSN: | 1664-302X, 1664-302X |
| On-line prístup: | Získať plný text |
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| Shrnutí: | Temperature variation can promote physico-chemical and microbial changes in the water transported through distribution systems and influence the dynamics of biofilms attached to pipes, thus contributing to the release of pathogens into the bulk drinking water. An experimental real-scale chlorinated DWDS was used to study the effect of increasing temperature from 16 to 24°C on specific pathogens, bacterial-fungal communities (biofilm and water samples) and determine the risk of material accumulation and mobilisation from the pipes into the bulk water. Biofilm was developed for 30 days at both temperatures in the pipe walls, and after this growth phase, a flushing was performed applying 4 gradual steps by increasing the shear stress. The fungal-bacterial community characterised by Illumina MiSeq sequencing, and specific pathogens were studied using qPCR:
Mycobacterium
spp.,
Mycobacterium avium
complex,
Acanthamoeba
spp.,
Pseudomonas aeruginosa
,
Legionella pneumophilia
, and
Stenotrophomonas maltophilia
. Sequencing data showed that temperature variation significantly modified the structure of biofilm microbial communities from the early stages of biofilm development. Regarding bacteria,
Pseudomonas
increased its relative abundance in biofilms developed at 24°C, while fungal communities showed loss of diversity and richness, and the increase in dominance of
Fusarium
genus. After the mobilisation phase,
Pseudomonas
continued being the most abundant genus at 24°C, followed by
Sphingobium
and
Sphingomonas.
For biofilm fungal communities after the mobilisation phase, Helotiales
incertae sedis
and
Fusarium
were the most abundant taxa. Results from qPCR showed a higher relative abundance of
Mycobacterium
spp. on day 30 and
M. avium
complex throughout the growth phase within the biofilms at higher temperatures. The temperature impacts were not only microbial, with physical mobilisation showing higher discolouration response and metals release due to the increased temperature. While material accumulation was accelerated by temperature, it was not preferentially to either stronger or weaker biofilm layers, as turbidity results during the flushing steps showed. This research yields new understanding on microbial challenges that chlorinated DWDS will undergo as global temperature rises, this information is needed in order to protect drinking water quality and safety while travelling through distribution systems. |
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| Bibliografia: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 This article was submitted to Microbiotechnology, a section of the journal Frontiers in Microbiology Reviewed by: Nadia Farhat, King Abdullah University of Science and Technology, Saudi Arabia; Vicente Gomez-Alvarez, United States Environmental Protection Agency (EPA), United States Edited by: Pascal E. Saikaly, King Abdullah University of Science and Technology, Saudi Arabia |
| ISSN: | 1664-302X 1664-302X |
| DOI: | 10.3389/fmicb.2021.658927 |