FIELD: electrochemical processes for purifying natural and sewage waters containing arsenic compounds. SUBSTANCE: method comprises steps of electric coagulation in diaphragm-free electrolyzer having steel consumable anodes and placed in autoclave while supplying oxygen at pressure 0.2 MPa. EFFECT: lowered electric energy consumption due to reduced voltage of electrolyzer in the result of cathode reduction of oxygen, enhanced efficiency of process due to improved purification degree of arsenic containing water. 1 tbl
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