Method for purifying waste water with added oxidizing agent

C - Chemistry – Metallurgy – 02 – F

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C02F 3/12 (2006.01) C02F 1/78 (2006.01)

Patent

CA 2620162

The invention concerns a method for purifying wastewater loaded with organic matter, said method including: a step of contacting wastewater with a biological culture containing a purifying biomass and a step of separating performed by filtration through organic or inorganic membranes. The invention is characterized in that at least part of the biological culture is subjected to an oxidative stress step enabling a liquor to be obtained by the action of at least one oxidizing agent used in small amount so as to preserve the biological activity of the purifying biomass while modifying the microbial floc to make it denser.

La présente invention concerne un procédé d'épuration d'eaux usées chargées en matières organiques, ledit procédé comprenant une étape de mise en contact des eaux usées avec une culture biologique contenant une biomasse épuratrice et une étape de séparation effectuée par filtration au travers de membranes organiques ou inorganiques, caractérisé en ce qu'au moins une partie de ladite culture biologique est soumise à une étape de stress oxydatif conduisant à l'obtention d'une liqueur par action d'au moins un agent oxydatif conduisant à l'obtention d'une liqueur par action d'au moins un agent oxydant mis en oeuvre en faible quantité de manière à préserver l'activité biologique de la biomasse épuratrice tout en modifiant la structure du floc microbien pour le rendre plus dense.

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