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Bacterial Community Structure in the Drinking Water Microbiome Is Governed by Filtration Processes
journal contribution
posted on 2012-08-21, 00:00 authored by Ameet
J. Pinto, Chuanwu Xi, Lutgarde RaskinThe bacterial community structure of a drinking water
microbiome
was characterized over three seasons using 16S rRNA gene based pyrosequencing
of samples obtained from source water (a mix of a groundwater and
a surface water), different points in a drinking water plant operated
to treat this source water, and in the associated drinking water distribution
system. Even though the source water was shown to seed the drinking
water microbiome, treatment process operations limit the source water’s
influence on the distribution system bacterial community. Rather,
in this plant, filtration by dual media rapid sand filters played
a primary role in shaping the distribution system bacterial community
over seasonal time scales as the filters harbored a stable bacterial
community that seeded the water treatment processes past filtration.
Bacterial taxa that colonized the filter and sloughed off in the filter
effluent were able to persist in the distribution system despite disinfection
of finished water by chloramination and filter backwashing with chloraminated
backwash water. Thus, filter colonization presents a possible ecological
survival strategy for bacterial communities in drinking water systems,
which presents an opportunity to control the drinking water microbiome
by manipulating the filter microbial community. Grouping bacterial
taxa based on their association with the filter helped to elucidate
relationships between the abundance of bacterial groups and water
quality parameters and showed that pH was the strongest regulator
of the bacterial community in the sampled drinking water system.
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drinking water distribution systemwater treatment processes16 S rRNA genefilterdistribution systemsource waterchloraminated backwash watertreatment process operations limitdrinking water plantdrinking water microbiomedrinking water systemwater quality parametersdrinking water systemsBacterial Community Structure
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