Record Display for the EPA National Library Catalog


Main Title Seattle tolt water supply mixed asbestiform removal study /
Author Kirmeyer, Gregory J.
CORP Author Seattle Dept. of Water, WA. Water Quality Div.;Municipal Environmental Research Lab., Cincinnati, OH.
Publisher Municipal Environmental Research Laboratory, Office of Research and Development ; Available through the National Technical Information Service,
Year Published 1979
Report Number EPA 600-2-79-125; EPA-R-804422
Stock Number PB80-117591
OCLC Number 13600560
Subjects Water--Purification--Filtration ; Asbestos fibers ; Water treatment plants--Washington (State)--Seattle
Additional Subjects Asbestos ; Water treatment ; Filtration ; Serpentine ; Amphiboles ; Pilot plants ; Turbidity ; Potable water ; Fibers ; Removal ; Flocculating ; Backwashing ; Mixers ; Fluid filters ; Alums ; Coagulation ; Calcium oxides ; Chemical analysis ; Monitoring ; Washington(State) ; Tolt Reservoir ; Seattle(Washington)
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EHAM  QH541.R2 EPA-, 600/2, 79-125 Region 1 Library/Boston,MA 04/29/2016
EJBD  EPA 600-2-79-125 Headquarters Library/Washington,DC 03/22/2019
ELBD ARCHIVE EPA 600-2-79-125 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ERAD  EPA 600/2-79-125 Region 9 Library/San Francisco,CA 10/01/2012
ESAD  EPA 600-2-79-125 Region 10 Library/Seattle,WA 11/07/1997
NTIS  PB80-117591 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xiii, 112 pages : illustrations ; 28 cm.
For 1 1/2 years the Seattle Water Department conducted direct filtration pilot plant studies at the Tolt Reservoir, obtaining data on techniques to remove amphibole and chrysotile asbestos from drinking water. Research showed that filtered water turbidity should be 0.1 ntu or lower in order to effectively remove fibers. Flocculation was necessary but sedimentation was not. Amphibole fibers are more readily removed than chrysotile, but both types could be reduced to below detectable limits or to not statistically significant counts by treatment with alum, lime and a filter aid (nonionic or anionic polymer); or alum, cationic polymer and a filter aid; or cationic polymer and a filter aid. Asbestos fiber content of filtered water increased sharply when filtered water turbidity rose above 0.1 ntu because of filtration rate changes, interruption of chemical feed, or turbidity breakthrough associated with the end of the filter run. The association of rising fiber counts and turbidities in filtered water would enable a plant operator to estimate fiber removal by observing turbidity if the filter was operated in the manner done in this work.
Prepared for U.S. Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory, under Grant no. 804422. "EPA 600-2-79-125." "August 1979." Cover title. Includes bibliographical references (pages 95-96).