BIOFILTRATION APPARATUS AND METHOD WITH CHEMICAL PRE-TREATMENT OF CONTAMINATED AIR

摘要

An apparatus (20) and method is provided for removing contaminants from a gas (28), wherein the gas flows through a gas treatment chamber (22) having a biological treatment zone (26) and a chemical treatment zone (24). The amount of a chemical agent (30) that is introduced into the chemical treatment zone (24) is adjusted in response to a sensed condition or conditions.