Record Display for the EPA National Library CatalogRECORD NUMBER: 5 OF 28
|Main Title||Coliforms in drinking water emanating from redwood reservoirs /|
|Author||Seidler, Ramon J.|
|CORP Author||Oregon State Univ., Corvallis. Dept. of Microbiology.;Municipal Environmental Research Lab., Cincinnati, OH.|
|Publisher||Environmental Protection Agency, Office of Research and Development [Office of Energy, Minerals, and Industry], Municipal Environmental Research Laboratory ; For sale by the National Technical Information Service,|
|Report Number||EPA/600/2-79/049; EPA-R-804456|
|Stock Number||PB-299 139|
|Subjects||Drinking water--Contamination ; Water--Microbiology ; Water--Storage ; Redwood (Wood) ; Coast redwood ; Water--Bacteriology|
|Additional Subjects||Coliform bacteria ; Reservoirs ; Bacteria ; Potable water ; Klebsiella ; Water treatment ; Chlorination ; Contamination ; Microorganisms ; Storage ; Redwood ; Wood ; Concentration(Composition) ; Drinking water|
|Collation||xi, 74 pages : illustrations ; 28 cm.|
Coliforms of the genus Klebsiella were found in many finished drinking water supplies which used reservoirs constructed from redwood. Coliform contamination was associated with slime which accumulated on some stave surfaces below the water line on the tank interior. Based on the results of field surveys, design modifications were made on an experimental 1,000 gallon reservoir in order to control coliform contamination. Coliforms were not found when free chlorine residuals of 0.3 to 0.4 ppm were maintained in the tank water. Poor water mixing and retention times of 7 days or longer made it difficult to maintain a free residual due to the chlorine demand of the wooden reservoir. Minimum retention times (less than 7 days) and adequate water mixing (no common inlet/outlet) can be achieved by proper choice of reservoir size and regulation of float levels. In the absence of free chlorine residuals, Klebsiella are able to multiply on water soluble nutrients leached from the redwood. Cyclitols, comprising 4.5% redwood dry weight, are the nutrients which uniquely support the growth of Klebsiella and Enterobacter in the redwood environment. Information in this report will be of interest to technically oriented personnel in water supply and treatment and environmental microbiologists.
Grant no. R804456. July 1979. Includes bibliographical references. Microfiche.