What is a biofilter?

Biofiltration is an air pollution control technique using microbial oxidation of gas contaminants in air.

Biofiltration eliminates gases by microbial consumption/oxidation of the gas compounds. The air passes over the filter medium covered with microorganisms. These microbes consume or oxidize the gas molecules, thereby, removing and destroying the gas compounds.

The catalysts of this oxidation are the digestive enzymes produced by microorganisms. The end-products are water, CO2, and small amounts of calcium salts and cell mass.

See why you might choose a biofilter over chemical scrubbing. (pdf)