Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Modeling the Inactivation of Giardia Lamblia.
Author Clark, R. M. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/499;
Stock Number PB91-196386
Additional Subjects Microbiology ; Giardia ; Potable water ; Disinfection ; Water treatment ; Chlorine ; Temperature ; Kinetics ; Enteroviruses ; Virulence ; Reprints ; Safe Drinking Water Act ; Giardia lamblia
Library Call Number Additional Info Location Last
NTIS  PB91-196386 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 19p
Under the auspices of the Safe Drinking Water Act (SDWA) the U.S. EPA has promulagated the Surface Water Treatment Rule (SWTR) requiring public water systems using surface water to provide minimum disinfection to control Giardia Lamblia, enteric viruses, and bacteria. The CT concept (concentration of disinfectant in mg/L times time in minutes) is used to establish the appropriate criteria for a surface system to achieve at least 99.9% inactivation of Giardia lamblia and 99.9% inactivation for viruses. In the SWTR, an empirical equation was developed based on water temperature, pH, concentration of chlorine, and inactivation level to predict required disinfection criteria (C times t values). The paper describes the development of an equation based on Chick-Watson kinetics that provides equivalent information but is theoretically more consistent.