Mass Balances, Engineering, Other Engineering

Engineers sometimes add chlorine to pipes to disinfect water. It is desired to achieve four logs of kill. This means that the effluent concentration of microoganisms is 10^-4 times the influent. If teh flow is 40ft^3/min, calculate teh volume of teh pipe required to achieve four logs of kill in the first-order rate constant for disinfection is 0.5 min^-1. If the pipe is 3 ft in diameter how long would the pipe have to be

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