The biotrickling system is used in the control and removal of odorous compounds, principally hydrogen sulfide (H2S), with the smallest available biological scrubber footprint and onefifth the operating costs of chemical scrubbers.

The system is used in the control and removal of odorous compounds, principally Hydrogen Sulfide (H2S). The system consists of a vertical or horizontal biological oxidation section. The system configuration enables the gaseous phase to flow counter-currently, or co-currently, through the bacteria oxidation ecosystem consisting of a recirculation solution containing mineral nutrients and trace elements flowing over the porous rock media. The scrubbing solution and media serve as the ecosystem for microorganisms, and is continuously re-circulated without the use of chemicals for neutralization, or the need for constant adjustment after start-up.