Gaseous Emission Control Biofiltration

The biological treatment of VOCs and other pollutants has received increasing attention in recent years. Biofiltration involves the removal and oxidation of organic compounds from contaminated air by beds of compost, peat, or soil. This treatment often offers an inexpensive alternative to conventional air treatment technologies such as carbon adsorption and incineration.

The simplest biofiltration system is a soil bed, where a horizontal network of perforated pipe is placed about 2 to 3 ft below the ground (Bohn 1992) (see Figure 5.22.1). Air contaminants are pumped through the soil pores, adsorbed on the surface of the moist soil particles, and oxidized by microorganisms in the soil.

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