Question: 3. A CMFR is operating at steady state with a second order decay reaction of rate constant k2=0.25 L/mg/d. It is exactly meeting its goal

3. A CMFR is operating at steady state with a second order decay reaction of rate constant k2=0.25 L/mg/d. It is exactly meeting its goal of 99.9% removal efficiency and the allowed maximum effluent concentration of 0.25 mg/L. The volumetric flow rate is 450 m3/d.

a. What is the influent concentration in mg/L? (~5 pts)

b. What is the reactor volume in m3? What volume would be required if the effluent concentration is allowed to be higher such that the removal efficiency is 99%? (~5 pts)

c. If the CMFR is replaced with a PFR, what reactor volume in m3 is needed for three nines removal? (~5 pts)

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