Question

Water contains 7.0 mg/L of soluble ion (Fe2 ) that is to be oxidized by aeration to a concentration of 0.25 mg/L. The pH of the water is 6.0 and temperature is 12oC. Assume the dissolved oxygen in the water is in equilibrium with the surrounding atmosphere. Laboratory results indicate the pseudo first-order rate constant for oxygenation of Fe2 is 0.175/min. Assuming steady-state operations and a flow rate of 40,000 m3 /d, calculate the minimum detention time and reactor volume necessary for oxidation of Fe2 to Fe3 . Perform the calculations for both a CMFR and PFR. (You should be able to work this out from information provided in Chapters 3 and 4.)

Answer 1

For CMFR:

V = 5286 m³

t = 2.6 hr

For PFR:

V = 529 m³

t = 19 minutes

Step-by-step explanation:

Find attached for the calculation.