Chapter
Apr 26, 2012
The Effects of Disinfection and Flow Rate on Biofilms Growing in Copper and Plastic Pipes
Authors: M. J. Lehtola [email protected], I. T. Miettinen, A. Hirvonen, T. Vartiainen, and P. J. MartikainenAuthor Affiliations
Publication: World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Abstract
In Kuopio, Finland, it has been built a pilot scale drinking water distribution system with copper and plastic (polyethylene) pipes. With this system we have studied how pipeline materials and flow regime affect water quality and biofilms. In plastic pipes, biofilms reached steady state faster than in copper pipes and microbial community structure was affected by the piping material. Increase in the flow velocity of the water from 0.03 m/s to approximately 0.3 m/s increased significantly the formation of biofilms. Increased biomass in biofilms had no effect on the bacterial concentrations in water, but even a small disturbance in flow regime detached bacteria and metals from biofilms and sediments to water. Chlorine eliminated effectively bacteria from biofilms of plastic pipes, but in copper pipes the disinfection efficiency was weaker, and was depending on the age of the biofilms.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Affiliations
Laboratory of Environmental Microbiology, National Public Health Institute (KTL), P.O.Box 95, FIN-70701, Kuopio, Finland. E-mail: [email protected]
I. T. Miettinen
Laboratory of Environmental Microbiology, National Public Health Institute (KTL), P.O.Box 95, FIN-70701, Kuopio, Finland
A. Hirvonen
Department of Environmental Sciences, University of Kuopio, P.O.Box 1627, FIN-70211, Kuopio, Finland
T. Vartiainen
Laboratory of Chemistry, National Public Health Institute (KTL), P.O.Box 95, FIN-70701, Kuopio, Finland and Department of Environmental Sciences, University of Kuopio, P.O.Box 1627, FIN-70211, Kuopio, Finland
P. J. Martikainen
Department of Environmental Sciences, University of Kuopio, P.O.Box 1627, FIN-70211, Kuopio, Finland
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