Discussion
Arrange the stages of an adsorption cycle in order:
1. Fresh bed adsorbs the pollutant with a clean outlet
2. The mass transfer zone advances through the bed
3. Breakthrough occurs and the outlet concentration rises
4. The bed is regenerated with steam and returned to service
Select the correct sequence.
Answer: C
Two beds are normally provided so that one adsorbs while the other regenerates, giving continuous treatment. Switching at breakthrough rather than saturation is what keeps the outlet clean throughout the adsorbing half of the cycle.
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