Chemical ‘A' is regulated by EPA and the maximum allowable concentration in water is 5 ?g/L. Design a reactor for a water treatment plant where 1000 ppm of chemical ‘A' is introduced at a flow rate of 100 m3/min. Assume (i) CMFR and (ii) PFR rector type and use a degradation rate of 0.5 d-1. Ensure that EPA regulation will be met for this chemical. List all assumptions being made. Which reactor should be preferred for this treatment plant and why?