Method and device for purifying liquid effluents

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/72 (2006.01)

Patent

CA 2683354

The invention relates to a method and a device for purifying liquid effluents, in which water is separated from substances by performing, in a single vertical enclosure (3), a vertical bubbling in the effluents fed at a flow rate d. The enclosure has a free surface and includes at least two compartments (4, 5, 6, 7) communicating together for enabling a circulation between the compartments successively from the top to the bottom and from the bottom to the top between the lower portion thereof and a medium level at a flow rate D at least three times higher than the flow rate d. The supernatant phase is continuously discharged and a hydraulic or gaseous chemical oxidation of said effluents is simultaneously carried out in the same enclosure, the chemical oxidation rate and the bubble flow rate and size being selected in order to progressively obtain a separation of the solid/liquid and liquid/liquid phases at the surface of the enclosure for obtaining a COD below a predetermined threshold.

La présente invention concerne un procédé et un dispositif d'épuration d' effluents liquides dans lequel on sépare l'eau des substances en effectuant dans une même enceinte verticale (3), un bullage vertical dans les effluents introduits à un débit d,. L'enceinte est à surface libre et comprend au moins deux compartiments (4, 5, 6, 7) communiquant entre eux pour permettre une circulation entre compartiments successivement du haut vers le bas et du bas vers le haut, entre leur partie basse et un niveau moyen à un débit D au moins trois fois supérieur au débit d. On évacue en continu la phase surnageante et on effectue simultanément dans la même enceinte une oxydation chimique hydraulique ou gazeuse desdits effluents, le débit d'oxydation chimique ainsi que le débit et la taille des bulles étant agencés pour obtenir progressivement une séparation de phases solide/liquide et liquide/liquide en surface de l'enceinte permettant l'obtention d'une DCO en dessous d'un seuil déterminé.

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