Activated sludge method and device for the treatment of effluent with nitrogen and phosphorus removal

Patent 6773596 Issued on August 10, 2004. Estimated Expiration Date:

July 31, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2359004

Waste water treatment plant and process
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Issued on: 10/30/1990
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System and process for purifying waste water which contains nitrogenous compounds
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Inventors

Application

No. 10343518 filed on 07/31/2001

US Classes:

210/605, Anaerobically, with subsequently aerobically treating liquid210/623, Of sludge or separated solid210/903, Nitrogenous210/906, Phosphorus containing210/195.1, Serially connected distinct treating or storage units210/260Including multiple operation unit

Examiners

Primary: Prince, Fred

Attorney, Agent or Firm

Pauley Petersen & Erickson

Foreign Patent References

32 35 992 DE 03/01/1984
39 15 026 DE 11/01/1989
37 16 782 DE 09/01/1992
35 01 585 DE 12/01/1992
197 37 373 DE 06/01/1998
9823542 WO 06/01/1998

International Classes

C02F 330
C02F 312

Abstract

A device and method for the treatment of effluent with activated sludge in suspension, for the removal of nitrogen and phosphorus and for simultaneous sludge stabilization. An activated chamber has a fermentation zone, a denitrification zone and a nitrification zone, whereby the fermentation zone and the denitrification zone in the activated chamber, are separated by scum boards and overflow barriers in the direction of flow, providing ascending flow and descending flow chambers in the anaerobic fermentation zone and the denitrification zone. A residence time and concentration of the activated sludge in the anaerobic fermentation zone, the denitrification zone, the nitrification zone and the settling tank may be controlled by changes to the intensity of recirculation of the effluent-sludge mixture in the anaerobic fermentation zone and recirculation of the recycled sludge to the denitrification zone, or by changing the continuous and short-term, intermittent operation of the recirculation within predetermined time intervals, to follow fixed temporal sequences, corresponding to the given time variations in effluent amount and loading.