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An emission control device that uses microorganisms to destroy volatile organic compounds and hazardous air pollutants.



apparatus for the biological treatment of sewage. It is a round or rectangular tank with a double bottom filled with a filtering material (boiler slag, granite chips, gravel, porous clay filler, and so on). The bottoms are at least 0.4 m apart. The filtering layer is 1.5–2 m high; the grainsize of the filtering layer is 30–50 mm, and of the lower underlying layer, 60–100 mm. When sewage passes through the filtering material, a biological film forms on its surface. The film consists of accumulations of bacteria and fungi that oxidize and mineralize the organic matter in the sewage. The oxidation capacity of a biofilter is determined experimentally.

References in periodicals archive ?
Tenders are invited for the project consists of annual source testing of apce consisting of three (3) landfill flares, one (1) dual landfill carbon unit, two (2) compost biofilters and one (1) lcec windrow.
Performance of different biofilters in a recirculating system for rainbow trout farming
Part 3 describes treatments, including fermentative biohydrogen production processes and vertical and horizontal flow constructed wetlands and biofilters.
Investigation into the air treatment efficiency of biofilters of different structures, Journal of Environmental Engineering and Landscape Management 18(1): 23-31.
The Walvis Bay Municipality contracted Aqua Services & Engineering to upgrade existing stone-media biofilters to the company's flagship trickling filter technology, for improved waste water treatment.
Allow gas and liquid to be distributed evenly within the biofilters bed; 4.
Microbiological investigation of activated pine bark charge for biofilters, Journal of Environmental Engineering and Landscape Management 11(1): 3-9.
Bamboo biofilters are particularly effective, given that, unlike trees, bamboo grows very quickly.
Dunn included UV sterilizers and upflow biofilters placed in the floor.