Discussion
Assertion (A): Activated carbon adsorption performs poorly on humid streams.
Reason (R): Water molecules compete with organic vapour for the same adsorption sites.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. Above roughly 50 per cent relative humidity, water condenses in the micropores of the carbon and occupies sites that would otherwise hold the organic vapour, so the working capacity falls - by half or more in a saturated stream. The remedy is to condition the gas first, by cooling and condensing the moisture out or by warming it to lower the relative humidity.
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