METHOD FOR TREATMENT OF SELENIUM IN SOLUTION CONTAINING SULFUR OXIDE

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Disclosed is a method for treating selenium in a solution containing a sulfur oxide. The method can separate and collect selenium contained in a discharged wastewater or a solution containing a sulfur oxide with high efficiency. The method comprises the steps of : adding hydrochloric acid to a discharged wastewater containing a sulfur oxide to adjust the pH value of the solution [Step S1]; adding ferrous chloride to reduce hexavalent selenium into tetravalent selenium [Step S2]; blowing air into the solution to oxide SO2 into SO3 [Step S3]; adding a rare earth compound to the solution to adsorb (tetravalent) selenium onto the rare earth compound [Step S4]; separating the rare earth compound having selenium adsorbed thereon; and collecting the resulting treatment solution.