4. Chlorine is used for primary disinfection at a water treatment plant that treats 0.55 m³/s of reservoir water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia inactivation rate constant for free chlorine disinfection is 0.55 min¹. Note that the inactivation rate constant is k* in the simplified Chick-Watson equation where: r(N) = -k*N and k* = kC” The plant achieves 3-log removal (99.9%) of Giardia at pH 7.0 in a plug flow contact chamber using free chlorine concentration of 2.1 mg/L. c. What is the volume of the contact chamber? d. If a CSTR, rather than a PFR, contact chamber were used, what would the required volume need to be? e. Assuming a coefficient of dilution of 0.975, what is the coefficient of specific lethality of Giardia (L/mg-min) under these conditions?
4. Chlorine is used for primary disinfection at a water treatment plant that treats 0.55 m³/s of reservoir water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia inactivation rate constant for free chlorine disinfection is 0.55 min¹. Note that the inactivation rate constant is k* in the simplified Chick-Watson equation where: r(N) = -k*N and k* = kC” The plant achieves 3-log removal (99.9%) of Giardia at pH 7.0 in a plug flow contact chamber using free chlorine concentration of 2.1 mg/L. c. What is the volume of the contact chamber? d. If a CSTR, rather than a PFR, contact chamber were used, what would the required volume need to be? e. Assuming a coefficient of dilution of 0.975, what is the coefficient of specific lethality of Giardia (L/mg-min) under these conditions?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:4. Chlorine is used for primary disinfection at a water treatment plant that treats 0.55 m³/s of
reservoir water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia
inactivation rate constant for free chlorine disinfection is 0.55 min¹. Note that the
inactivation rate constant is k* in the simplified Chick-Watson equation where:
r(N) = -k*N
and
k* = kC”
The plant achieves 3-log removal (99.9%) of Giardia at pH 7.0 in a plug flow contact
chamber using free chlorine concentration of 2.1 mg/L.
c. What is the volume of the contact chamber?
d. If a CSTR, rather than a PFR, contact chamber were used, what would the required
volume need to be?
e. Assuming a coefficient of dilution of 0.975, what is the coefficient of specific lethality of
Giardia (L/mg-min) under these conditions?
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