Discussion
A biofilter removes gaseous pollutants by
Answer: C
Correct answer: Passing it through a moist microbial bed
A biofilter passes the gas slowly through a bed of compost, peat or wood chips carrying a moist biofilm. The pollutant partitions into the water layer and is metabolised by the microorganisms to carbon dioxide, water and biomass. It works only on biodegradable compounds at low concentration, needs the bed kept moist and near neutral pH, and requires a long residence time - but it consumes almost no energy, which is what makes it right for large dilute odorous streams.
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