METHOD FOR PROCESSING A NITROUS AQUEOUS LIQUID EFFLUENT BY CALCINATION AND VITRIFICATION

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The invention relates to a method for processing a nitrous aqueous liquid effluent containing nitrates of metals or metalloids, including a step of calcinating the effluent in order to convert the metal or metalloid nitrates into metal or metalloid oxides, at least one compound selected from the metal or metalloid nitrates and the other compounds of the effluent resulting in a sticky oxide upon calcination, and a dilution additive resulting in a non-sticky oxide upon calcination being added to the effluent prior to the calcination step, wherein the dilution additive includes aluminium nitrate and at least one nitrate selected from iron nitrate and rare earth nitrates.