Field assessment of bacterial communities and total trihalomethanes: Implications for drinking water networks

Operation and maintenance (O&M) of drinking water distribution networks (DWDNs) in tropical countries simultaneously face the control of acute and chronic risks due to the presence of microorganisms and disinfection by-products, respectively. In this study, results from a detailed field characte...

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Veröffentlicht in:The Science of the total environment Jg. 616-617; S. 345 - 354
Hauptverfasser: Montoya-Pachongo, Carolina, Douterelo, Isabel, Noakes, Catherine, Camargo-Valero, Miller Alonso, Sleigh, Andrew, Escobar-Rivera, Juan-Carlos, Torres-Lozada, Patricia
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands Elsevier B.V 01.03.2018
Schlagworte:
Bacteria
Bacteria - classification
bacterial communities
Biofilm
Biofilms
Bulk water
byproducts
Chlorine
Disinfection
Disinfection by-products
drinking water
Drinking Water - chemistry
Drinking Water - microbiology
Drinking water quality
free radicals
genes
habitats
microbiological quality
Operation and maintenance
plankton
ribosomal RNA
risk
RNA, Ribosomal, 16S
temperature
Trihalomethanes - analysis
Tropical Climate
water distribution
Water Microbiology
Water Pollutants, Chemical - analysis
Water Purification
water quality
Water Supply
Chlorine
Biofilm
Bacteria
Disinfection by-products
Bulk water
Operation and maintenance
Drinking water quality
ISSN:0048-9697, 1879-1026, 1879-1026
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Zusammenfassung:Operation and maintenance (O&M) of drinking water distribution networks (DWDNs) in tropical countries simultaneously face the control of acute and chronic risks due to the presence of microorganisms and disinfection by-products, respectively. In this study, results from a detailed field characterization of microbiological, chemical and infrastructural parameters of a tropical-climate DWDN are presented. Water physicochemical parameters and the characteristics of the network were assessed to evaluate the relationship between abiotic and microbiological factors and their association with the presence of total trihalomethanes (TTHMs). Illumina sequencing of the bacterial 16s rRNA gene revealed significant differences in the composition of biofilm and planktonic communities. The highly diverse biofilm communities showed the presence of methylotrophic bacteria, which suggest the presence of methyl radicals such as THMs within this habitat. Microbiological parameters correlated with water age, pH, temperature and free residual chlorine. The results from this study are necessary to increase the awareness of O&M practices in DWDNs required to reduce biofilm formation and maintain appropriate microbiological and chemical water quality, in relation to biofilm detachment and DBP formation. [Display omitted] •Biofilms are not routinely monitored in drinking water networks.•The microbial ecology of a tropical water network was characterised by molecular methods.•In this study, key engineered factors and microbiological parameters correlated•Bacterial communities in bulk water were different from those in biofilms.•Biofilms must be monitored and controlled to preserve drinking water quality.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2017.10.254