Method for treating water by advanced oxidation and...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 9/02 (2006.01) C02F 1/52 (2006.01) C02F 1/72 (2006.01)

Patent

CA 2708563

The invention relates to a method for treating water charged with colloidal impurities, either dissolved or suspended, in a treatment plant, wherein said method comprises: the step of contacting said water, in an advanced oxidation area (10), with hydrogen peroxide in the presence of at least one transition-metal salt; a flocculation step that comprises contacting said water, in a flocculation area (12), with at least one flocculation additive and with at least one ballast comprising at least one non-soluble granular material denser than water and used as a biomass carrier; the step of feeding the water and floc mixture thus obtained into a settling area (14); the step of separating the treated water at the upper portion of said settling area (14) from a mixture of sludge and ballast resulting from the settling of said flocs; the step of extracting the sludge and ballast mixture at the lower portion (23) of said settling area (24); and the step of recycling at least a portion of the sludge into said advanced oxidation area (10).

L'invention concerne un procédé de traitement d'une eau chargée d'impuretés colloïdales, dissoutes ou en suspension, dans une installation de traitement, ledit procédé comprenant selon l'invention : - une étape de mise en contact, dans une zone d'oxydation avancée (10), de ladite eau avec du peroxyde d'hydrogène en présence d'au moins un sel de métal de transition; - une étape de floculation consistant à mettre en contact, dans une zone de floculation (12), ladite eau avec au moins un adjuvant de floculation, et avec au moins un ballast constitué d'au moins un matériau granulaire insoluble plus dense que l'eau et servant de support à une biomasse; - une étape d'introduction du mélange d'eau et de flocs ainsi formé dans une zone de décantation (14); - une étape de séparation de l'eau traitée en partie haute de ladite zone de décantation (14) d'un mélange de boue et de ballast résultant de la décantation desdits flocs; - une étape d'extraction du mélange de boue et de ballast en partie basse (23) de ladite zone de décantation (24); - une étape de recyclage d'au moins une partie des boues dans ladite zone d'oxydation avancée (10).

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