Process and facility for the treatment of effluents heavy...

C - Chemistry – Metallurgy – 02 – F

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C02F 11/08 (2006.01) C02F 1/52 (2006.01) C02F 1/74 (2006.01) C02F 3/00 (2006.01)

Patent

CA 2185907

An integrated method for purifying industrial and/or urban effluents containing a large amount of organic material in solution and/or suspension, wherein said effluents are treated in a wet oxidation reactor (10) in which said effluents are oxidised in the presence of at least one oxidising gas to mineralise a large part of the organic material therein by producing a gas phase (13) and an essentially liquid phase (12) mainly containing soluble residual organic material, as well as an essentially inorganic solid phase in suspension. Said essentially liquid phase from the reactor is subjected to liquid/solid separation to separate said solid phase, and at least a fraction of said separated solid phase (26) is recycled in said wet oxidation reactor. Various alternative embodiments of the method, in which a catalyst and/or an agent for acidifying the recycled solid phase fraction may be added, are provided. The facilities may operate continuously or semi-continuously.

L'invention concerne un procédé intégré d'épuration d'effluents industriels et/ou urbains contenant une proportion importante de matière organique soluble et/ou en suspension, selon lequel on traite lesdits effluents dans un réacteur d'oxydation (10) en milieu humide au sein duquel on fait subir auxdits effluents une oxydation en présence d'au moins un gaz oxydant de façon à minéraliser une partie importante de la matière organique contenue dans lesdits effluents, en produisant d'une part une phase gazeuse (13), et d'autre part une phase essentiellement liquide (12) contenant principalement de la matière organique résiduelle soluble ainsi qu'une phase solide essentiellement minérale en suspension, caractérisé en ce qu'on effectue une étape de séparation liquide/solide de ladite phase essentiellement liquide issue dudit réacteur pour isoler ladite phase solide, et en ce qu'on recycle, dans ledit réacteur d'oxydation en milieu humide, au moins une fraction de ladite phase solide séparée (26). Le procédé peut connaître différentes variantes correspondant à l'ajout d'un catalyseur et/ou de moyens d'acidification de la fraction de phase solide recyclée. Les installations peuvent fonctionner en continu ou en semicontinu.

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