A filter bed for sewage treatment consisting of coarse material and operated at high speed, often with recirculation.
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 It might be outdated or ideologically biased.
a device for the biological purification of sewage. It is distinguished from a biofilter by the greater height of its filtering layer (up to 4 m) and the presence of a device for forced ventilation, which provides great oxidation capabilities. Air is transmitted with the aid of ventilators under overpressure of 200 mm of a column of water. Each cu m of aerofilter volume handles up to 5 cu m of sewage per day.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
A bed of coarse material used for the rapid filtering of sewage; recirculation of the effluent
may be employed.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.