Process and installation for treating effluents loaded with organic matter, in particular by wet oxidation, with internal recycling of solid residues.

摘要

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.