METHOD FOR PURIFICATION OF WASTE WATERS FROM THIOCYNATE Russian patent published in 2009 - IPC C02F1/72 C02F1/463 C02F103/16 

FIELD: chemistry.

SUBSTANCE: waste waters containing thiocyanate and beforehand added hydrogen peroxide are passed through galvanocoagulative charge (mixture of iron turnings and coke taken in equal volume parts) with simultaneous fed of air oxygen. The thiocyanate oxidation with hydrogen peroxide is carried out at pH 2-2.5 in the presence of iron ions continuously generated at intensive dissolution of anode component of galvanocoagulative charge Fe-C at mole ratio H₂O₂/SCN^- equal 4-1. The claimed method provides the high level of water purification, decrease of oxidiser consumption due to permanent generation of iron catalyst directly in purification process, significant decrease of operating costs and cost decrease of purification process due to usage for active loading of waste products - iron turnings (prompt industrial scrap) and coke. Besides the claim method allows to decontaminate the waste waters from heavy metal ions and to decrease the salt content in recycled water.

EFFECT: claim method is safe and economically expedient.

3 cl, 1 dwg, 2 ex