Impact of disinfection on drinking water biofilm bacterial community

Influence of hydraulic regimes and Cl2/NH3-N mass ratios on the bacterial structure and composition in an experimental flow cell chloraminated drinking water system

“…According to previous studies, bacterial groups showed different sensitivity to disinfectant 45,46 . The results from the current study are in agreement with researches on microbial structure detected in systems with chloraminated water 2,[47][48][49] ,…”

Bacterial community changes in copper and PEX drinking water pipeline biofilms under extra disinfection and magnetic water treatment

“…In this study, beta diversity of bacterial communities in extra-disinfected copper and PEX biofilms was clearly different from communities in control copper and PEX pipes, respectively. Chlorine dosing is important factor influencing the microbial diversity (Mi et al 2015). In our study, even a minor addition to chlorine dosing (increase in total chlorine c. 0Á5-1 mg l À1 , free chlorine 0Á1-0Á5 mg l À1 ) at 2 months' time seemed to have an impact on the active fraction of bacterial biofilm communities in copper and PEX pipes measured as beta diversities in the rRNA libraries.…”

“…Chlorine dosing is important factor influencing the microbial diversity (Mi et al . ). In our study, even a minor addition to chlorine dosing (increase in total chlorine c .…”

Disinfection Processes

“…Two antibiotic resistant strains of E. coli were more resistant to TiO2 disinfection in distilled water and subsequently regrew more than an antibiotic sensitive strain; a specified mixture of the two antibiotic resistant bacteria (ARB) had four-fold greater gene pair conjugant numbers than the control system with no disinfection, but gene pair conjugant numbers and survival rates were lower in final effluent from an urban wastewater treatment plant (Dunlop et al, 2015). Sequencing of a bacterial community in a benchscale pipe biofilm showed that proteobacteria tended to predominate in chloraminated drinking water biofilms, while Firmicutes predominated in chlorinated and unchlorinated biofilms; the major proteobacterial groups were influenced by both disinfectant type and dosage (Mi et al, 2015). Biomass was significantly higher in water mains with corrosion tubercles than cement-lined iron mains, and communities located underneath corrosion tubercles were dominated by sulfate-reducing bacteria from the genus Desulfovibrio; communities on the interior main surfaces were comprised of a core group of 17 genera, with…”