C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 3/28 (2006.01)
Patent
CA 2523360
The invention relates to a method for purifying coke waste water that is charged with nitrogen compounds, cyanides and sulfides. According to the inventive method, the coke waste water passes through a reactor (3) that is integrated into a liquid cycle (2) and that comprises at least one gas- permeable membrane tube (5) whose interior is impinged upon by an oxygenous pressurized gas (4). On the exterior of the membrane tube (5) which is immersed in the liquid, a biofilm (6) is maintained in whose inner region (7) rich in oxygen due to the gas-permeability of the membrane tube (5) nitrogenous compounds are selectively nitrified to nitrates while at the same time nitrates are denitrified to elemental nitrogen in an oxygen-poor outer region (8) of the biofilm (6).
L'invention concerne un procédé pour l'épuration d'eaux usées de cokerie chargées en composés d'azote, en cyanures et en sulfures. Selon l'invention, les eaux usées de cokerie traversent un réacteur (3) qui est intégré dans un circuit de liquide (2) et qui contient au moins une membrane tubulaire (5) perméable aux gaz et sollicitée, côté intérieur, par un gaz comprimé (4) contenant de l'oxygène. On maintient sur le côté extérieur de la membrane tubulaire (5), autour duquel s'écoule le liquide, un film biologique (6) dans la zone intérieure (7) riche en oxygène duquel se produit, grâce à la perméabilité aux gaz de la membrane tubulaire (5), une nitrification sélective en nitrates des composés azotés contenus dans les eaux usées et dans une zone extérieure (8) pauvre en oxygène duquel se produit simultanément une dénitrification des nitrates en azote élémentaire.
Mcfadden Fincham
Uhde Gmbh
LandOfFree
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