Biofiltration is an odor control technology that uses a biologically active filter bed to treat odorous chemical compounds. Materials such as soil, leaf compost, peat, and wood chips can be used for the filter bed. The filter bed provides an environment for microorganisms to degrade and ultimately remove the odorous chemical compounds.

Ideal operating requirements for a filter bed include high adsorption capacity, low pressure drop, high void fraction, high nutrient content, neutral to slightly alkaline pH, moderate temperatures, and adequate moisture content. Hydrogen sulfide, ammonia, and most organic components can be broken down in a biological filter, while most inorganic components cannot.

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