METHOD FOR REMOVING NITROGEN FROM AQUEOUS MEDIA Russian patent published in 2019 - IPC C02F3/30 C02F1/58 C01B21/02 C01B21/22 C02F101/16 

FIELD: water treatment.

SUBSTANCE: invention can be used for purification of waste water containing organic compounds of nitrogen and ammonia. Method is realized by NH₄⁺ conversion in an aqueous medium in NO₂^- by aerobic nitrification, reduction of obtained NO₂^- in N₂O under anaerobic conditions and decomposition of N₂O to N₂ with release of energy. At the NO₂^- reduction step up to N₂O, mixture of iron (II) sulphate and iron (III) sulphate is used. In a preferable version, said mixture per 3 mol of iron (II) sulphate contains 1 mole of iron (III) sulphate. Aqueous medium is a concentrate, a centrifugate or a filtrate of the process of sludge dehydration.

EFFECT: method provides higher efficiency of removing high concentrations of nitrogen compounds from aqueous media.

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