Compound A in wastewater degrades according to a 1st order reaction in a flow re

Question

Compound A in wastewater degrades according to a 1st order reaction in a flow reactor. The influent enters the reactor at 1 million gallons per day containing 250 mg/L of A. Assume that 90% of A degrades in the reactor and that the rate constant is 0.5/hr.

a. What is the volume of the reactor if the reactor is a PFR? What are its dimensions (length, width, depth) if it has a length/width ratio = 20 and the depth is 15 feet?

b. What is the volume of the reactor if the reactor is a CSTR? What are its dimensions if the length / width ratio = 1 and the depth is 15 feet?

Explanation / Answer

a)

b)

The startup of a fixed volume CSTR under isothermal conditions is rare, but it does occur occasionally. We can, however, carry out an analysis to estimate the time necessary to reach steady-state operation. For the case when the reactor is well mixed and as a result there are no spatial variations in rA

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