• AWWA WQTC60568
Provide PDF Format

Learn More

AWWA WQTC60568

  • Biofilms on Rubber Material as Cause of Coliform Contamination of Drinking Water
  • Conference Proceeding by American Water Works Association, 11/15/2004
  • Publisher: AWWA

$12.00$24.00


Gate valves with rubber-coated wedges were found to be the cause of coliform contaminations ofdrinking water without disinfectant residual. The characteristic organism was Citrobacter freundii,which was isolated from the drinking water as well as from the surface of the rubber-coated wedges.The rubber on the wedges was covered with excessive biofilms in which the coliform bacteria musthave multiplied after initial inoculation by contaminated water. Thus, one of the prerequisites forminimizing the potential of coliform proliferation was to reduce biofilm formation on the rubbersurface. This was achieved by developing new rubber types with strongly reduced proportions ofmicrobiologically degradable components.In drinking water distribution systems rubber materials with excessive biofilms provide a potentialhabitat for potentially pathogenic bacteria and have to be considered as a potential source ofcontamination in non-chlorinated drinking water. Includes 10 references, tables, figures.

Related Products

AWWA 51866

AWWA 51866

Show Me the Savings! Do New Homes Use Less Water?..

$12.00 $24.00

AWWA DSS69201

AWWA DSS69201

A Time-Saving Method for Getting More Data Out of Your Tracer Studies..

$12.00 $24.00

AWWA ACE92136

AWWA ACE92136

Biodegradability of Natural Organic Matter: A Comparison of Methods (BDOC and AOC) and Correlations..

$12.00 $24.00

AWWA ACE99442

AWWA ACE99442

From an Anonymous Supplier to a Well-Known Supplier: From "Taken for Granted" to "Bra..

$12.00 $24.00