You are designing a reactor that uses chlorine in a PFR of CMFR to destroy pathogens in water. A minimum contact time of 30 mins 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 constant?
B)What is the minimal size (in gallons) of the reactor required for a plug flow reactor?
C)What size (in gallons) of CMFR would be required to reach the same outlet concentration
D) Which reactor requires the least Volume? Briefly explain why the PFR and CMFR volumes are different for achieving the same degree of pathogen reduction.
E) If the desired chlorine residual in the treater water after it leaves the reactor is .20mg/L, and the chlorine demand used during treatment is.15mg/L, what must be the daily mass of chlorine added to the reactor in grams?