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Bacterial community change through drinking water treatment processes
Liao, X.; Chen, C.; Wang, Z.; Chang, C.-H.; Zhang, X. & Xie, S.
Abstract
The microbiological quality of drinking water
has aroused increasing attention due to potential public
health risks. Knowledge of the bacterial ecology in the
effluents of drinking water treatment units will be of practical
importance. However, the bacterial community in the
effluents of drinking water filters remains poorly understood.
The changes of the density of viable heterotrophic bacteria
and bacterial populations through a pilot-scale drinking
water treatment process were investigated using heterotrophic
plate counts and clone library analysis, respectively.
The pilot-scale treatment process was composed of preozonation,
rapid mixing, flocculation, sedimentation, sand filtration
postozonation, and biological activated carbon
(BAC) filtration. The results indicated that heterotrophic
plate counts decreased dramatically through the drinking
water treatment processes. Clone library analysis indicated
the significant change of bacterial community structure
through the water treatment processes. Betaproteobacteria
was dominant in raw water, the sand filter effluent and the
BAC filter effluent. This work could provide some new
insights on drinking water microbial ecology.
Keywords
Biological activated carbon; Drinking water treatment system; Sand filter; Microbial community
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