A minimum contact time of 30 min is required to reduce the


you are designing a reactor that uses chlorine in a PFR or CMFR to destroy pathogens in water. A minimum contact time of 30 min is required to reduce the pathogen concentration from 100 pathogens/L to below 1 pathogen/L through a first-order decay process. You plan on treating water at a rate of 1,000 gal/min.

(a) what is the first-order decay rate constant?

(b) what is the minimum size (in gallons) of the reactor required for a plug flow reactor?

(c) What size (in gallon) of CMFR would be required to reach the same outlet concentration?

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Civil Engineering: A minimum contact time of 30 min is required to reduce the
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