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Main Title Predicting the inactivation of giardia lamblia : a mathematical and statistical model /
Author Clark, R. M. ; Black, D. A. ; Pien, S. H. ; Read, E. J.
Other Authors
Author Title of a Work
Clark, Robert Maurice.
United States.
CORP Author Environmental Protection Agency, Cincinnati, OH. Drinking Water Research Div. ;Nevada Univ., Las Vegas. ;Computer Sciences Corp., Cincinnati, OH.
Publisher U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory,
Year Published 1989
Report Number EPA/600/2-89/046
Stock Number PB89-233472
Subjects Drinking water--Purification--United States ; Drinking water--United States--Purification
Additional Subjects Water treatment ; Potable water ; Disinfectants ; Mathematical models ; Kinetics ; Forecasting ; Turbidity ; Time measurement ; Legionella ; Giardia lamblia
Library Call Number Additional Info Location Last
NTIS  PB89-233472 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 53 pages : illustrations ; 28 cm
The 1986 Amendments to the Safe Drinking Water Act (SDWA) require EPA to promulgate primary Drinking Water Regulations (a) specifying criteria under which filtration would be required, (b) requiring disinfection as a treatment technique for all public water systems, and (c) establishing maximum contaminant levels (MCLs) or treatment requirements for control of Giardia lamblia viruses, Legionella, heterotrophic plate count, bacteria, and turbidity. Giardia lamblia is one of the most resistant organisms to disinfection by chlorine found in water and therefore the Surface Water Treatment Rule specifies 'C times t' (the product as concentration of disinfectant with mg/L and disinfectant contact time in minutes) for 99.9% inactivation of Giardia cysts. Many factors influence Giardia lamblia reaction kinetics including temperature, pH, chlorine concentration and inactivation level. The paper develops a model to describe these interactions and to predict C times t values based on specific model inputs. A strategy is proposed that uses the model to provide conservative C times t values for regulatory purposes.
Caption title. Distributed to depository libraries in microfiche. "August 1989." "EPA/600/2-89/046." Giardia lamblia. Microfiche.