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3. Suppose you are to design a chlorination tank for killing microorganisms in the effluent from a wastewater treatment plant. It is necessary to achieve 99.99% kill in a wastewater

flow of 100m^3/hr. Assume the disinfection is a first order reaction with a rate constant of 0.2 min a. Calculate the tank volume if the contact tank is a completely mixed flow reactor. b. Calculate the tank volume if the contact tank is a plug flow reactor. c. What is the retention time of both reactors?

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