Imhoff tank

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Imhoff tank:

see septic tankseptic tank,
underground sedimentation tank in which sewage is retained for a short period while it is decomposed and purified by bacterial action. The organic matter in the sewage settles to the bottom of the tank, a film forms excluding atmospheric oxygen, and anaerobic
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Imhoff Tank


a structure or tank in which sewage is settled and clarified and the sediment is digested by anaerobic bacteria (seeANAEROBES). Settling takes place in the upper compartment, or story, of the tank, and digestion of the sludge, in the lower compartment. In the Soviet Union, such tanks are called twostory settling reservoirs. Imhoff tanks are often referred to as Emscher tanks, since they were first built in 1906 in the Emscher River region (the Emscher is a tributary of the Rhine in Germany).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

Imhoff tank

[′im‚hȯf ‚taŋk]
(civil engineering)
A sewage treatment tank in which digestion and settlement take place in separate compartments, one below the other.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.