Discussion
Match each condition in List I with the method it favours in List II.
List I
A. Large dilute odorous stream
B. Concentrated recoverable solvent
C. Moderate mixed organics
D. Acid gas from coal combustion
List II
1. Condensation or adsorption with recovery
2. Biofiltration
3. Alkaline scrubbing
4. Catalytic incineration
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each condition points to one method. A large dilute odorous stream of biodegradable compounds goes to biofiltration, since heating it would be prohibitive. A concentrated recoverable solvent goes to condensation or adsorption, both of which return the material in usable form. Moderate concentrations of mixed organics suit catalytic incineration, which destroys them at modest fuel cost. Acid gas from coal combustion is neutralised by alkaline scrubbing.
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