Chlorine is used for primary disinfection at a water treatment plant that treats 0.20 m^3/s of reservoir water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia inactivation rate constant for free chlorine disinfection is 0.53 min^-1. Note that the inactivation rate constant is k* in the simplified Chick-Watson equation where the rate of inactivation r(N): r(N) = -k*N and k* = kC^n The plant achieves 3-log removal of Giardia at pH 6.0-9.0 in a plug flow contact chamber using free chlorine concentration of 2.0 mg/L. (a) What is the volume of contact chamber? (b) If a CSTR, rather than PFR, contact chamber were used, what would the required volume need to be? (c) What volume of contact chamber would be needed if it were constructed as five separate CSTR chambers in series? The volume asked for is the combined volume of all five separate chambers. (d) Assuming a coefficient of dilution of 1.0, what is the coefficient of specific lethality for Giardia under these conditions?
Chlorine is used for primary disinfection at a water treatment plant that treats 0.20 m^3/s of reservoir water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia inactivation rate constant for free chlorine disinfection is 0.53 min^-1. Note that the inactivation rate constant is k* in the simplified Chick-Watson equation where the rate of inactivation r(N): r(N) = -k*N and k* = kC^n The plant achieves 3-log removal of Giardia at pH 6.0-9.0 in a plug flow contact chamber using free chlorine concentration of 2.0 mg/L. (a) What is the volume of contact chamber? (b) If a CSTR, rather than PFR, contact chamber were used, what would the required volume need to be? (c) What volume of contact chamber would be needed if it were constructed as five separate CSTR chambers in series? The volume asked for is the combined volume of all five separate chambers. (d) Assuming a coefficient of dilution of 1.0, what is the coefficient of specific lethality for Giardia under these conditions?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Chlorine is used for primary disinfection at a water treatment plant that treats 0.20 m^3/s of reservoir
water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia inactivation rate
constant for free chlorine disinfection is 0.53 min^-1. Note that the inactivation rate constant is k* in the
simplified Chick-Watson equation where the rate of inactivation r(N):
r(N) = -k*N and k* = kC^n
The plant achieves 3-log removal of Giardia at pH 6.0-9.0 in a plug flow contact chamber using free
chlorine concentration of 2.0 mg/L.
water. Giardia (a protozoan) is the primary pathogen of concern, and the Giardia inactivation rate
constant for free chlorine disinfection is 0.53 min^-1. Note that the inactivation rate constant is k* in the
simplified Chick-Watson equation where the rate of inactivation r(N):
r(N) = -k*N and k* = kC^n
The plant achieves 3-log removal of Giardia at pH 6.0-9.0 in a plug flow contact chamber using free
chlorine concentration of 2.0 mg/L.
(a) What is the volume of contact chamber?
(b) If a CSTR, rather than PFR, contact chamber were used, what would the required volume need
to be?
(c) What volume of contact chamber would be needed if it were constructed as five separate CSTR
chambers in series? The volume asked for is the combined volume of all five separate chambers.
(d) Assuming a coefficient of dilution of 1.0, what is the coefficient of specific lethality for Giardia
under these conditions?
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