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BIOFILM IN DRINKING WATER DISTRIBUTION SYSTEMS
Citation:
Meckes*, M C. BIOFILM IN DRINKING WATER DISTRIBUTION SYSTEMS. Presented at ORD/Regional Workshop on Emerging Issues with Aquatic Environmental Pathogens, Ft. Meade, MD, 9/5-7/2001.
Description:
Throughout the world there are millions of miles of water distribution pipe lines which provide potable water for use by individuals and industry. Some of these water distribution systems have been in service well over one hundred years. Treated water moving through a distribution system comes into contact with a wide range of materials under a variety of conditions which can affect water quality. Suspended solids in finished water can settle out under low flow conditions and can be resuspended as flows increase. Disinfectants and water additives, react with organic and inorganic materials within the distribution system producing by-product compounds which may be undesirable in the water supply. Oxidant resistant microorganisms can colonize; pipe surfaces, cracks, and crevices producing a complex micro environment know as "biofilm." These biofilms can be highly resistant to many disinfection methods and techniques. This resistance to disinfection can extend to the entire colony of microbes which can include microbial indicators of contamination such as coliform bacteria. The objective of this presentation is to discuss the factors that contribute to growth of drinking water distribution system biofilms, and EPA's WSWRD's research efforts. Included as part of the presentation will be a discussion of EPA's pilot-scale Distribution System Simulators and how they are being used to support biofilm research.