The company can either buy a single 200m^3 ideal plug flow tank, or three 80m^3 completely mixed tanks that operate in series. the cost is essentially the same.
The pollutant is removed as a part of a first order reaction with a rate constant value of 0.12min^-1. the volumetric flow rate to be treated is 600m^3/hr.
Any viable system must remove at least 85% of the target pollutant. Determine which system, if any, represents the better treatment option.