FIELD: water treatment. SUBSTANCE: arsenic-containing solutions are treated in vortex electromagnetic field with iron salt in corresponding alkali solution and simultaneously introducing them into reaction chamber of velocity layer apparatus, which results in formation of difficultly soluble precipitate containing ferric arsenate and ferric hydroxide wherein content of arsenic ranges from 3.5 to 24.5 wt %. Dissolved arsenic compounds are isolated from water by means of adsorption of ferric oxohydrate formed in water being treated in velocity layer. Once settled down and coagulated, solid and liquid phases are separated. EFFECT: improved procedure. 1 dwg
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