Method and apparatus for biological removal of nitrogen...

Details Method and apparatus for biological removal of nitrogen... Method and apparatus for biological removal of nitrogen...

C - Chemistry, Metallurgy

02

F

C02F 3/30 (2006.01) C02F 3/12 (2006.01) C02F 3/22 (2006.01)

Patent

CA 2288642

Method of removing nitrogen and its compounds from water using biological process in activated sludge suspension. The nitrogen in the form of nitrates and nitrites is removed by means of a denitrification proceeding in a fluidized layer of sludge blanket, the layer being formed by a suspension of biological sludge and being kept in a fluidized condition. Apparatus for performing the method comprises an upwards widening denitrification zone (5), into the lower part of which an admission for the water containing nitrates, an admission for the activated sludge and an admission for the substrate, which has been biologically oxidized during the denitrification, mouth.

L'invention concerne un procédé d'extraction de l'azote et de ses composés à partir de l'eau au moyen d'un processus biologique dans une suspension de boue activée. L'azote se présentant sous la forme de nitrates et de nitrites est extrait au moyen d'un processus de dénitrification dans une couche fluidisée d'une couverture de boue, la couche étant formée par une suspension de boue biologique et maintenue à l'état fluidisé. L'appareil de mise en oeuvre du procédé comprend une zone de dénitrification (5) s'élargissant vers le haut, dans la partie inférieure de laquelle débouchement une admission pour l'eau contenant des nitrates, une admission destinée à la boue activée et une admission pour le substrat, ayant été oxydé biologiquement pendant la dénitrification.

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