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Question: a drinking water treatment plant uses ozone for predisinfection ozone...

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A drinking water treatment plant uses ozone for pre-disinfection. Ozone is injected into a 3.0 ft. diameter pipe and the water flows 3,400 ft. through the pipe to the water plant at a flow rate of 10,000 gallons/min. The ozone concentration follows first-order kinetics as it degrades in water. The ozone concentration decreases by 50% in 12 minutes. Find the concentration of ozone (mg/L) that should be added at the beginning of the pipe so that the concentration at the end of the pipe is 1.0 mg/L? Assume the pipe can be modeled as a plug flow reactor 4.
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