Sequential disinfectant treatment for waste water

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/76 (2006.01) A61L 2/18 (2006.01) A61L 11/00 (2006.01) C02F 1/00 (2006.01) C02F 1/68 (2006.01)

Patent

CA 2375774

A method and apparatus for sequentially dosing waste water with a disinfectant at a plurality of spaced locations along a flow path (15), such as within a contact tank (10). Dosages of disinfectant introduced at each location are proportioned or graded such that the dosage at each location is less than the dosages delivered upstream therefrom. The graded dosing provides a level of disinfectant effective to destroy or otherwise render harmless microorganisms in the waste water and minimize the residual disinfectant remaining at the end of the flow path while employing a lesser total amount of disinfectant in comparison to conventional, single-dosage techniques.

L'invention concerne un procédé et un dispositif destinés à doser séquentiellement des eaux usées avec un agent désinfectant sur une pluralité de positions espacées le long d'un chemin d'écoulement (15) tel qu'un bassin de mélange (10). Les quantités d'agent désinfectant introduites sur chaque position sont proportionnées ou échelonnées de manière que la quantité sur chaque position est inférieure aux quantités introduites en amont. Le dosage échelonné permet de mettre en oeuvre un niveau d'agent désinfectant efficace pour détruire ou inactiver des micro-organismes présents dans les eaux usées, et minimiser la quantité d'agent désinfectant résiduelle restant au bout du chemin d'écoulement, tout en employant une quantité totale d'agent désinfectant réduite par rapport aux techniques de dosage unique habituelles.

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