A treatment plant has two reactors connected in series. The first one is a plug flow reactor with a residence time of 5 hours and the second is a completely mixed flow reactor with a residence time of 10 hours. At time zero, a conservative tracer begins to be pumped into the first reactor, producing a constant tracer concentration of 150 µg/L at the inlet of the reactor. The tracer is continuously pumped for a period of 48 hours.
(i)Plot the concentration of tracer at the outlet of the each of the two reactors during the first 24 hours of the tracer study. (Hint: You may need to use mass balances to obtain equations that predict the concentration of tracer as a function of time)