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An emission control device that uses microorganisms to destroy volatile organic compounds and hazardous air pollutants.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Part 3 describes treatments, including fermentative biohydrogen production processes and vertical and horizontal flow constructed wetlands and biofilters. B&w process diagrams are included.
Biofilters are employed for removing butanol, acetone, xylene, toluene and other volatile organic compounds from air.
Experimental investigation and assessment of the effectiveness of peat media made from sulfur compounds helps with making suggestions based on designing efficient and cost-effective biofilters for different industries (Chung et al.
First, identify the behaviors of different nitrogen compounds until the activation of the biofilters. Subsequently calculated performance indicators VTR (Volumetric Conversion Rate), STR (Surface Conversion Rate) and PRN (Percentage of TAN removal).
For this second edition, they have fully revised and updated the original material and added new chapters on air binding, filter-clogging algae, carbonate precipitation through alkalinity analysis, polymer retention analysis, biomass and biofilm determination, and biofilters. Other topics include organizing a filter evaluation program, backwash bed expansion analysis, top of gravel footprint analysis, sieve testing procedure, and sludge retention profile.
Ayeng also visited the workshop, during his visit and said, "We are in debited to INDBATT1 for conducting such a useful and important workshop about water purification and construction of biofilters as we all are aware of the grave water-borne diseases prevalent in the area and unhealthy condition of Nile River water".
Seaweeds provide an alternative to bacterial biofilters. They consume nutrients directly from the seawater [carbon (C), nitrogen (N), and phosphorus (P)] and their biomass can be easily removed from the system.
Investigation into the air treatment efficiency of biofilters of different structures, Journal of Environmental Engineering and Landscape Management 18(1): 23-31.