CHEMICAL PRECIPITATION METHOD FOR ANION REMOVAL UNDER ELECTRIC FIELD AND CONTINUOUS PROCESS FOR ANION REMOVAL

摘要

PURPOSE: A chemical precipitation method for anion removal under electric field is provided, which can reduce consumption of alumina cement and calcium compounds by 50% compared with that of existing method with higher anion removing efficiency. The method also can get rid of corrosion problems encountered with the using of salt or presence of salt in treated water. CONSTITUTION: The chemical precipitation method is characterized in that under electric field, a mixture of alumina cement and calcium compounds is injected into contaminated water so that anions present in water react with cationic ions released from the mixture to form insoluble complex, wherein the weight ration of alumina cement/calcium compounds is 1.4 to 4.0, the mixture of alumina cement and calcium compounds is injected in an amount of 100 to 450g per one equivalent of anion, the calcium compounds are quick lime or calcium hydroxide, and the intensity of electric current in electric field is 0.01 to 0.5 A.