Discussion
Arrange these methods in order of increasing pollutant concentration at which they are appropriate:
1. Biofiltration of a large dilute odorous stream
2. Adsorption on activated carbon
3. Thermal or catalytic incineration
4. Condensation for recovery
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4
The methods are chosen by concentration. Biofiltration handles the very dilute, high-volume streams where combustion would cost prohibitive fuel. Adsorption suits low to moderate concentrations and can concentrate the pollutant for recovery or destruction. Incineration becomes attractive at moderate to high concentrations, where the stream approaches self-sustaining combustion. Condensation is for the highest concentrations, where the recovered liquid has value in its own right.
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