3. Determine the number of completely mixed chlorine contact chambers each having a detention time of 30 minutes that would be required in series arrangement to reduce the bacterial count

of a treated effluent from 10° to 14.5 organisms/mL if the first-order removal rate constant is equal to 6.1/hr. If a plug flow chlorine contact chamber were used with the same detention time as the series of completely mixed chambers, what would be the bacterial count after treatment?