Ozone (O3) can be used to disinfect drinking water. Ozone is highly reactive and can react with chemical species and pathogens in water. It has been found in batch tests that ozone reacts according to a first-order reaction such that its concentration decreases by 50 percent in 10 minutes (i.e., t1/2 = 10 min). A water supplier elects to use ozone as a pretreatment and injects it into the water delivery pipe entering the plant. The pipe is 2.5 feet in diameter with a length of 4,000 feet and handles a steady-state flow of 12,000 gpm. If the pipe can be considered a perfect PFR, identify the following. a. What is the water velocity in the pipe (in ft/s)? b. What initial concentration of ozone is required at the beginning of the pipe to have a 1.0 mg/L concentration at the outlet? c. How much ozone must be added daily (in lb/day) if the O3 transfer process is 80% efficient?
Ozone (O3) can be used to disinfect drinking water. Ozone is highly reactive and can react with chemical species and pathogens in water. It has been found in batch tests that ozone reacts according to a first-order reaction such that its concentration decreases by 50 percent in 10 minutes (i.e., t1/2 = 10 min). A water supplier elects to use ozone as a pretreatment and injects it into the water delivery pipe entering the plant. The pipe is 2.5 feet in diameter with a length of 4,000 feet and handles a steady-state flow of 12,000 gpm. If the pipe can be considered a perfect PFR, identify the following. a. What is the water velocity in the pipe (in ft/s)? b. What initial concentration of ozone is required at the beginning of the pipe to have a 1.0 mg/L concentration at the outlet? c. How much ozone must be added daily (in lb/day) if the O3 transfer process is 80% efficient?
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions
Section: Chapter Questions
Problem 86IL: The acid-catalyzed iodination of acetone CH3COCH3(aq) + I2(aq) CH3COCH2I(aq) + HI(aq) is a common...
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Ozone (O3) can be used to disinfect drinking water. Ozone is highly reactive and can react with
chemical species and pathogens in water. It has been found in batch tests that ozone reacts
according to a first-order reaction such that its concentration decreases by 50 percent in 10
minutes (i.e., t1/2 = 10 min). A water supplier elects to use ozone as a pretreatment and injects it
into the water delivery pipe entering the plant. The pipe is 2.5 feet in diameter with a length of
4,000 feet and handles a steady-state flow of 12,000 gpm. If the pipe can be considered a perfect
PFR, identify the following.
a. What is the water velocity in the pipe (in ft/s)?
b. What initial concentration of ozone is required at the beginning of the pipe to have a 1.0
mg/L concentration at the outlet?
c. How much ozone must be added daily (in lb/day) if the O3 transfer process is 80% efficient?
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