Method for biological purification of water using a carrier...

C - Chemistry – Metallurgy – 02 – F

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C02F 3/10 (2006.01) C12N 11/08 (2006.01)

Patent

CA 2476593

Method for biological purification of water such as wastewater using a carrier material, wherein the water is treated in a reactor containing carriers for biofilm growth. These carriers are kept in movement in the water and are designed so that they have well-defined passages or compartments providing a surface for biofilm growth, which is protected against collision with the surfaces of other carriers. The carriers have a width or diameter greater than 20 mm, the protected area is larger than 1000 m2~/m3~ carrier element volume, the length of the passages or the depth of the compartments in the carrier elements as a mean value is smaller than 6 mm or smaller than 3 mm, respectively, and the ratio between the passage lengths or compartment depths and the longest dimension of the inlet openings to the passages or compartments, respectively, is smaller than 3.

La présente invention concerne un procédé de purification biologique de l'eau telle que des eaux d'égout à l'aide d'une matière support, l'eau étant traitée dans un réacteur contenant des supports de croissance de film biologique. Lesdits supports sont maintenus en mouvement dans l'eau et sont conçus de sorte qu'ils présentent des passages ou des compartiments bien définis assurant une surface de croissance de film biologique, qui est protégée contre toute collision avec les surfaces d'autres supports. Lesdits supports présentent une largeur ou un diamètre supérieur à 20 mm, la zone protégée est supérieure à 1000 m2/m3 en volume d'éléments de support, la longueur des passages ou la profondeur des compartiments dans les éléments de support servant de valeur moyenne est inférieure à 6 mm ou inférieure à 3 mm, respectivement, et le rapport entre les longueurs des passages ou les profondeurs des compartiments et la dimension la plus longue des ouvertures d'entrée par rapport aux passages ou aux compartiments, respectivement, est inférieure à 3.

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