Liquid purification or separation – Recirculation
Reexamination Certificate
2007-09-11
2007-09-11
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Recirculation
C210S220000, C210S630000
Reexamination Certificate
active
11416109
ABSTRACT:
An apparatus for removing nitrogen is provided herein. In the apparatus, the nitrogen is removed from wastewater containing a BOD component and ammonium nitrogen by anaerobic ammonium oxidation. The apparatus includes a distributor, which distributes the wastewater into two portions; a nitrification vessel which connects to a first portion of said two portions, in which ammonia contained in wastewater distributed to the first portion is nitrified by ammonium oxidizing bacteria; a denitrification vessel which connects to a second portion of said two portions, in which wastewater distributed to the second portion is denitrified by denitrification bacteria; an anaerobic ammonium oxidation vessel, in which mixed water of first treated water from the nitrification vessel and second treated water from the denitrification vessel is subjected to anaerobic ammonium oxidation by ammonium oxidizing bacteria; and a returning line which feeds back a third treated water from the anaerobic ammonium oxidation vessel to the denitrification vessel for denitrification and BOD decomposition.
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Strous, Marc et al., “Ammonium Removal From Concentrated Waste Streams With The Anaerobic Ammonium Oxidation (Anammox) Process In Different Reactor Configurations” Water Research,Pergamon Press, Oxford, Great Britain, vol. 31, No. 8, Aug. 1997, pp. 1955-1962, XP00487763, ISSN: 0043-1354.
Isaka Kazuichi
Sumino Tatsuo
Barry Chester T.
Hitachi Plant Engineering & Construction Co. Ltd.
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