Discussion
Effect of operating variables on activated carbon working capacity.
| Variable | Change | Effect on capacity |
|---|---|---|
| Temperature | Increase | Decrease |
| Humidity | Increase | Decrease |
| Pollutant concentration | Increase | Increase |
| Competing organics | Increase | Decrease |
What pre-treatment does the table suggest for a warm humid stream?
Answer: C
Correct answer: Cool and dry the gas beforehand
The table shows capacity falling with both temperature and humidity, so a warm humid stream is doubly disadvantaged. Cooling raises the capacity directly and, by condensing out moisture, removes the water that would otherwise compete for the adsorption sites - though cooling alone raises the relative humidity, so a condensing cooler or a subsequent reheat is used. Heating would lower the relative humidity but reduce capacity through the temperature effect.
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