Method for biologically purifying waste water

Details Method for biologically purifying waste water Method for biologically purifying waste water

C - Chemistry, Metallurgy

02

F

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

Patent

CA 2515299

A method is described for the biological cleaning of waste water, in which the waste water and gas are supplied to a reaction vessel (1) containing micro organisms through a two--component nozzle (2) which consists exclusively of two steady mutually concentric tubes, said nozzle having no additional supply elements and projecting into the reaction vessel and into the waste water therein along its vertical axis. The internally located gas-conveying inner tube of the two-component nozzle (2) is surrounded through the intermediary of a free annular gap by the outer tube conveying the waste water which is delivered by means of a pump (12). The gas is supplied to the inner tube by means of a blower (13) and it ends within the outer tube at a spacing from the outlet opening (3) thereof which is greater by at least the factor "5" than the internal diameter of the outer tube in the vicinity of the outlet opening (3). The outlet opening (3) of the outer tube and thus the two-component nozzle (2) is spaced from the base (4) of the reaction vessel (1), which contains no further fittings other than the two-component nozzle (2), by a distance which is greater than half the height of the waste water in the reaction vessel (1).

Procédé de purification biologique d'eaux usées selon lequel les eaux usées et du gaz sont introduits dans une cuve de réaction (1) contenant des micro-organismes via une buse (2) binaire (2) qui comporte exclusivement deux tuyaux concentriques exempts d'entraves, qui ne comporte pas d'éléments d'introduction supplémentaires et qui pénètre selon un axe vertical dans la cuve de réaction (1) de manière à plonger dans les eaux usées se trouvant dans ladite cuve. Le tuyau interne, acheminant le gaz, de la buse binaire (2) est entouré par le tuyau externe acheminant les eaux usées refoulées par une pompe (12), un espace annulaire libre étant défini par les deux tuyaux. Le gaz est introduit dans le tuyau interne à l'aide d'une soufflante (13). L'extrémité du tuyau interne est située à l'intérieur du tuyau externe et se trouve à un certaine distance de l'orifice de sortie (3) du tuyau externe, distance qui est supérieure, d'au moins un facteur "5", au diamètre interne du tuyau externe dans la zone de l'orifice de sortie (3). L'orifice de sortie (3) du tuyau externe, et partant de la buse binaire, se trouve à une distance du fond (4) de la cuve de réaction (1), ne contenant pas d'autres éléments à l'exception de la buse binaire (2), qui est supérieure à la moitié de la hauteur des eaux usées se trouvant dans la cuve de réaction (1).

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