Question: The continuous stirred tank reactor (CSTR) is used to treat an industrial waste stream by a reaction which destroys the waste according to first-order kinetics.

The continuous stirred tank reactor (CSTR) is used to treat an industrial waste stream by a reaction which destroys the waste according to first-order kinetics. The reaction rate, k, is 0.216 day-1. The reactor volume is 500 m3, the volumetric flow rate at the inlet and outlet is 50 m3/day, and the inlet waste concentration is 100 mg/L.

(a) What is the outlet concentration (mg/L) ?

(b) What is the retention time (days) in the CSTR?

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