5. Imagine an industrial wastewater treatment plant has been using a CMFR to degrade acontaminant prior to discharge. A PFR is installed to operate in parallel with the sameresidence time.

Under which order(s) of reaction would the effluent from the PFR have alower concentration than the effluent from the CMFR? a) Zero orderb) First orderc) Second orderd) First and second ordere) None of the above