Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Analysis of Inactivation of 'Giardia lamblia' by Chlorine.
Author Clark, R. M. ; Read, E. J. ; Hoff., J. C. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Drinking Water Research Div. ;Computer Sciences Corp., Cincinnati, OH.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/533;
Stock Number PB91-196253
Additional Subjects Drinking water ; Water microbiology ; Giardia lamblia ; Chlorine ; Decontamination ; Kinetics ; pH ; Temperature ; Water treatment ; Reprints ; Safe Drinking Water Act
Library Call Number Additional Info Location Last
NTIS  PB91-196253 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 13p
Amendments to the Safe Drinking Water Act (PL-93-523) highlight the continuing problem of waterborne disease by mandating the EPA to promulgate: (1) Criteria by which filtration will be required for surface water supplies; and (2) disinfection requirements for all water supplies in the United States. There is interest on the part of the EPA in applying the Ct concept for determining the inactivation of Giardia lamblia cysts as a key criterion for determining exceptions to the filtration rule. If a utility, in addition to meeting other requirements, can demonstrate that through effective disinfection, manifested by a sufficient Ct value, it can reduce Giardia levels by 99.9%, then it will be exempted from surface water filtration. In the paper, a model for calculation of Ct values based on animal infectivity data is developed. The model, based on first-order kinetics, relates Ct values to chlorine concentration, pH and temperature. The model predictions are compared to laboratory data.