METHOD OF PURIFYING HIGH-ARSENIC-CONTAINING WASTE WATER Russian patent published in 2019 - IPC C02F9/04 C02F1/28 B01J20/14 B01J20/32 C01G28/02 C02F101/20 

FIELD: metallurgy.

SUBSTANCE: invention can be used for reclamation of technogenic territories contaminated as a result of activity of nonferrous and ferrous metallurgy enterprises, facilities for storage and destruction of chemical weapons, industrial waste burial sites, dumps, for cleaning industrial and domestic waste water from arsenic. Method for complex drainage treatment of waste arsenic-containing water formed during washing of polluted arsenic-contaminated soil involves stepwise purification, first on an adsorption filter with bentonite granules to reduce colour and turbidity to required level, then for extraction of arsenic compounds - on adsorption filter with bentonite granules coated with iron hydroxide, then for final cleaning of solution - on reverse-osmosis filter. Post-reverse-osmosis filter, the waste concentrate is returned to the first purification step. Flushing solution purified from compounds of arsenic and other impurities after the composition correction is returned to the production cycle.

EFFECT: invention provides an ecologically clean and cost-effective technology of treating waste water from arsenic compounds to the MCL level without formation of secondary wastes.

1 cl, 6 tbl, 3 ex