Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Seattle Distribution System Corrosion Control Study. Volume 4. On-Site Evaluation of Corrosion Treatment.
Author Herrera, Carlos E. ; Nakhjiri, Karen S. ; Hoyt, Brian P. ;
CORP Author Seattle Dept. of Water, WA. Water Quality Div.;Municipal Environmental Research Lab, Cincinnati, OH.
Year Published 1983
Report Number EPA-R-806686; EPA-600/2-83-056;
Stock Number PB83-241729
Additional Subjects Corrosion prevention ; Distribution systems ; Plumbing ; Water treatment ; Calcium oxides ; Sodium carbonates ; Water pipes ; Leaching ; Protection ; Iron ; Copper ; Lead(Metal) ; Comparison ; Bacteria ; pH ; Effectiveness ;
Library Call Number Additional Info Location Last
NTIS  PB83-241729 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 80p
For 8 months, the Seattle Water Department conducted a corrosion treatment pilot plant study, obtaining data on the treatment of Tolt River water with lime and sodium carbonate. Pipe loop tests were conducted to determine the appropriate chemical start-up procedures for two full-scale corrosion treatment facilities; to document the effectiveness of the corrosion treatment program in suppressing corrosion, metal leaching and tuberculation in older galvanized steel premise plumbing systems; to document the bacterial effects of the corrosion treatment program on water quality; and to anticipate any possible customer problems caused by implementation of the corrosion treatment program. The study monitored the effects of simulated corrosion treatment start-up on chemical and microbial water quality from an old galvanized plumbing system. Standing water samples collected after treatment start-up displayed increased iron deposits, organic debris and bacterial populations compared to untreated standing water samples. Zinc leaching was reduced during treatment from pH 6 to pH 7 and increased from pH 7 to pH 8. Iron leaching was found to increase by approximately 38% during treatment start-up, while copper and lead leaching were reduced by 53% and 57%, respectively. Corrosion treatment also resulted in a reduction of approximately 32% in the tuberculation rate.