PROCESS FOR TREATING AQUEOUS EFFLUENTS COMPRISING METALLIC SALTS OF NITRATE OR NITRITE TYPE

摘要

The present invention relates to a method of treating an aqueous effluent E containing, in solution, at least one nitrate or a metal nitrite of a metal M, said method comprising the steps of: (I) introducing into the aqueous effluent E of the NH 4 + cations in aqueous solution, generally in the form of an aqueous solution of ammonia; then (II) treating the medium obtained at a temperature of 100 to 700 ° C and at a pressure of 1 to 50 MPa (that is to say between 10 and 500 bar), whereby a nitrate conversion is obtained; metal M metal oxide M, nitrogen and water.