Discussion
A biofilter treats \( 4.5 \) m\(^3\)/s with a bed volume of \( 90 \) m\(^3\). The empty bed residence time is
Answer: C
Correct answer: 20 seconds
The empty bed residence time is the bed volume divided by the volumetric gas flow:
\[ EBRT = \frac{90}{4.5} = 20 \text{ seconds} \]It is called empty bed because the volume used is the whole bed, not the void fraction, which makes it a simple and comparable design parameter. Twenty to sixty seconds is typical for odour control; readily degraded compounds need less, and recalcitrant ones more.
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