Method and installation for treating effluents, comprising...

C - Chemistry – Metallurgy – 02 – F

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C02F 11/06 (2006.01) C02F 3/12 (2006.01)

Patent

CA 2394359

The inventive method is characterized in that it comprises a stage in which the sludge from the biological treatment stage or the separation stage is degraded. During said degradation stage, the sludge is brought into contact with an ozonised gas in conditions in which it is possible to obtain a floc consisting of granules with an average size of over 200 microns and a level of volatile matter of between 50 and 65 %, the thickening factor of the granular sludge after a decantation of 30 minutes always being greater than 4. The granular sludge is obtained by: treating between 0.1 and 2, preferably between 0.1 and 1.5 times the mass of sludge present in the biological treatment stage; and applying a dose of ozone of between 3 and 100 grams ozone per kilogram suspended matter (SM) treated, preferably between 4 and 10 grams of ozone per kilo of suspended matter (SM) treated.

Ce procédé est caractérisé en ce qu'il comporte une étape de dégradation des boues, issues soit de l'étape de traitement biologique, soit de l'étape de séparation au cours de laquelle les boues sont mises au contact d'un gaz ozoné dans des conditions permettant d'obtenir un floc constitué de granules dont la dimension moyenne est supérieure à 200 microns, le taux de matière volatile est compris entre 50 et 65 %, le facteur d'épaississement de ces boues granuleuses, après une décantation de 30 minutes étant toujours supérieur à 4, les conditions d'obtention desdites boues granulaires consistant à: traiter entre 0,1 et 2 fois la masse de boues présente dans l'étape de traitement biologique et de préférence entre 0,7 et 1,5 et, appliquer une dose d'ozone comprise entre 3 et 100 grammes d'ozone par kilogramme de matières en suspension (MES) traitées, de préférence entre 4 et 10 grammes d'ozone par kilo de MES traité.

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