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- W4386988424 abstract "Abstract Biofilms within drinking water distribution systems are an important habitat for drinking water microorganisms. However, they can play a role in microbial regrowth, water discoloration and can be a reservoir for unwanted microorganisms. In this study, we investigated whether indicator organisms for drinking water quality, such as coliforms, can settle in mature drinking water biofilms. Therefore, a biofilm monitor consisting of glass rings was used to grow and sample drinking water biofilms. Two mature drinking water biofilms were characterized by flow cytometry, ATP measurements, confocal laser scanning microscopy and 16S rRNA sequencing. Overall, biofilms developed under treated chlorinated surface water supply exhibited lower cell densities in comparison with biofilms resulting from treated groundwater. We observed that water sources shaped the biofilm community composition while drinking water disinfection determined the biofilm density. In addition, the response of the biofilm microbiome and possible biofilm detachment after minor water quality changes were investigated. Limited changes in pH and free chlorine addition, to simulate operational changes that are relevant for practice, were evaluated. It was shown that both biofilms remained resilient. Finally, mature biofilms were prone to invasion of the coliform, Serratia fonticola . After spiking low concentrations (i.e. ± 100 cells/100 mL) of the coliform to the corresponding bulk water samples, the coliforms were able to attach and get established within the mature biofilms. These outcomes are emphasizing the need for continued research on biofilm detachment and its implications for water contamination in distribution networks." @default.
- W4386988424 created "2023-09-24" @default.
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- W4386988424 date "2023-09-23" @default.
- W4386988424 modified "2023-10-16" @default.
- W4386988424 title "Unwanted coliforms can hide in mature drinking water biofilms, grown in full-scale distribution networks" @default.
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- W4386988424 doi "https://doi.org/10.1101/2023.09.21.558492" @default.
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