METHOD OF ION-EXCHANGE PURIFICATION OF SEWAGE WATERS AND TECHNOLOGICAL SOLUTIONS FROM METAL IONS Russian patent published in 2015 - IPC C02F1/42 C02F1/28 B01J20/32 C02F103/04 

FIELD: chemistry.

SUBSTANCE: invention can be used in industry at the stage of fine or additional purification of water from traces of heavy metal ions, in the purification of vapour condensate in boiler houses and TPP plants in the creation of closed technological water circulation. To realise the method of ion-exchange water purification sewage waters and technological solutions are passed through a sorbent, containing hydrazide groups. as the sorbent used is activated carbon, preliminarily processed with a gas mixture of ammonia and hydrazine, taken in volume ratios of 1:2-2.5, at a temperature of 350-450°C. The method provides the removal of ions of metals with a variable valence: Cu²⁺, Zn²⁺, Ni²⁺, Cr³⁺, Fe³⁺, as well as ions of metals: Bi³⁺, Zr⁴⁺, Sr²⁺, Co²⁺ from water, with the preservation by the sorbent of the sorption activity in a wide range of the water solution pH values.

EFFECT: purification of water from traces of heavy metal ions.

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