Discussion
The point at which the outlet concentration of an adsorption bed begins to rise is called _____.
Answer: D
Correct answer: breakthrough
Breakthrough is the point at which the mass transfer zone reaches the outlet of the bed and the effluent concentration starts to rise. It comes before saturation, sometimes well before, so the working capacity used in design is always less than the equilibrium capacity. The bed is switched at breakthrough, since running past it means emitting the pollutant to buy the remaining capacity.
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