Imhoff tank

Imhoff tank

The Imhoff tank, named for German engineer Karl Imhoff (1876–1965), is a chamber suitable for the reception and processing of sewage. It may be used for the clarification of sewage by simple settling and sedimentation, along with anaerobic digestion of the extracted sludge. It consists of an upper chamber in which sedimentation takes place, from which collected solids slide down inclined bottom slopes to an entrance into a lower chamber in which the sludge is collected and digested. The two chambers are otherwise unconnected, with sewage flowing only through the upper sedimentation chamber and no flow of sewage in the lower digestion chamber. The lower chamber requires separate biogas vents and pipes for the removal of digested sludge, typically after 6-9 months of digestion. The Imhoff tank is in effect a two-story septic tank and retains the septic tank's simplicity while eliminating many of its drawbacks, which largely result from the mixing of fresh sewage and septic sludge in the same chamber.

Imhoff tanks are being superseded in sewage treatment by plain sedimentation tanks using mechanical methods for continuously collecting the sludge, which is moved to separate digestion tanks. This arrangement permits both improved sedimentation results and better temperature control in the digestion process, leading to a more rapid and complete digestion of the sludge.

This method of sediment removal is also used in some drinking water treatment facilities, in which the tank is often called an Imhoff cone. As in sewage treatment, the collected sludge must be properly disposed of.

See also

*Anaerobic digester types
*List of waste water treatment technologies

External links

* [] Water/Wastewater Distance Learning at Mountain Empire Community College

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Look at other dictionaries:

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  • Imhoff-Tank — Ịmhoff Tank   [nach K. Imhoff], der Emscherbrunnen …   Universal-Lexikon

  • imhoff tank — ˈimˌhȯf , hōf noun Usage: usually capitalized I Etymology: after Karl Imhoff b1876 German engineer : a tank for sewage clarification consisting of an upper or sedimentation chamber with sloping floor leading to slots through which the solids… …   Useful english dictionary

  • IMHOFF — GERMANY (see also List of Individuals) 7.4.1876 Mannheim/D 28.9.1965 Essen/D Karl Imhoff made civil engineering studies at the Technical Universities of Munich and Karlsruhe and then started as an engineer with Baden County in 1899. In 1903,… …   Hydraulicians in Europe 1800-2000

  • Septic tank — A septic tank, the key component of a septic system, is a small scale sewage treatment system common in areas with no connection to main sewage pipes provided by private corporations or local governments. (Other components, typically mandated… …   Wikipedia

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  • Emscherbrunnen — Emscherbrunnen, entwickelt 1907 von Karl Imhoff a) Absetzraum b) Faulschlammabzug c) Schlammentnahme d) Schwimmschlammabzug f) Faulraum Der Emscherbrunnen, auch Imhoff Tank genannt, ist ein Absetzbecken zur mechanischen… …   Deutsch Wikipedia

  • Sludge — is the residual semi solid material left from industrial, water treatment, or wastewater treatment processes.When fresh sewage or wastewater is added to a settling tank, approximately 50% of the suspended solid matter will settle out in about an… …   Wikipedia

  • Settling — is the process by which particulates settle to the bottom of a liquid and form a sediment. Settling velocity or fall velocity or terminal velocity (ws) of a (sediment) particle is the at which the sediment settles in still fluid. It is diagnostic …   Wikipedia

  • sewage system — Collection of pipes and mains, treatment works, and discharge lines (sewers) for the wastewater of a community. Early civilizations often built drainage systems in urban areas to handle storm runoff. The Romans constructed elaborate systems that… …   Universalium

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