Process and installation for the treatment of effluents by...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/72 (2006.01) C02F 1/02 (2006.01) C02F 11/08 (2006.01)

Patent

CA 2202905

The invention relates to a process of aqueous phase oxidation of effluents, consisting of subjecting said effluents to oxidation in the presence of at least one oxidising agent inside a reactor in which a gaseous phase is set up above the liquid phase consisting of the effluents, and of subjecting said gaseous phase to catalysis in the presence of at least one heterogeneous catalyst, said process being carried out at a temperature of between approximately 20°C and approximately 350°C under a total pressure of between approximately 1 and approximately 160 bars, in such manner as to mineralise at least part of the organic matter and total ammoniated nitrogen contained in said effluents. characterized in that it comprises a stage consisting of recycling at least part of said gaseous phase present in said oxidation reactor after its passage through said heterogeneous catalyst, in such manner as to provide it with sufficient contact time with said effluents in order to obtain substantial removal of NH3, COR and volatile organic compounds.

L'invention concerne un procédé d'oxydation en phase aqueuse d'effluents consistant à faire subir auxdits effluents une oxydation en présence d'au moins un agent oxydant à l'intérieur d'un réacteur dans lequel une phase gazeuse est ménagée au-dessus de la phase liquide constituée par les effluents et à faire subir à ladite phase gazeuse une catalyse en présence d'au moins un catalyseur hétérogène, ledit procédé étant effectué à une température comprise entre environ 20 DEG C et environ 350 DEG C, sous une pression totale comprise entre environ 1 et environ 160 bars, de façon à minéraliser au moins une partie de la matière organique et de l'azote ammoniacal et total contenu dans lesdits effluents, caractérisé en ce qu'il comprend une étape consistant à recycler au moins une partie de ladite phase gazeuse présente dans ledit réacteur d'oxydation après passage sur ledit catalyseur hétérogène, de manière à lui assurer un temps de contact suffisant avec lesdits effluents pour obtenir une élimination substantielle de NH3, de la DCO et des composés organiques volatils.

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