Advanced oxidation of water using catalytic ozonation

C - Chemistry – Metallurgy – 02 – F

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C02F 1/78 (2006.01) C02F 1/72 (2006.01)

Patent

CA 2231193

Contaminants are removed from waste water (1) by an advanced oxidation process in which the waste water is contacted (7) with ozone (8) in the absence of a catalyst to oxidize-ozone-oxidizable contaminants and to dissolve ozone in the water, and the resultant ozone-containing water (3) is contacted with a solid ozone activating catalyst (5) to oxidize ozone refractory contaminants in the water. Effluent (6) from the catalyst treatment (5) can be contacted (7) with ozone and recycled (2) for further contact with the catalyst (5). The preferred catalyst is an undoped monolithic structure of gamma alumina having low surface area, high porosity and low pressure drop.

On supprime des contaminants des eaux usées (1) au moyen d'un procédé d'oxydation poussée, qui consiste à mettre ces eaux usées en contact (7) avec de l'ozone (8), en l'absence d'un catalyseur, afin que les contaminants pouvant être oxydés à l'ozone s'oxydent et que l'ozone se dissolve dans l'eau, puis à mettre l'eau obtenue contenant de l'ozone (3) en contact avec un catalyseur solide (5) d'activation d'ozone, afin que les contaminants réfractaires à l'ozone contenus dans l'eau s'oxydent. On peut mettre en contact avec de l'ozone (7) l'effluent (6) provenant du traitement catalytique (5) et le recycler (2) dans le but de le remettre en contact avec le catalyseur (5). Le catalyseur préféré est une structure monolithique non dopée constituée d'alumine gamma, présentant une faible surface, une porosité élevée et une faible chute de pression.

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