Abstract
Removal of selenate ion (SeO42-) by chemical reduction using Fe3O4 powder is investigated. Selenate is reduced to elemental selenium which is precipitated on the surface of the Fe3O4 powder. Both selenite ion (SeO32-) and hydrogen selenide (H2Se) are not detected during the experiments. Ferrous and ferric ions which are accumulated during the reaction are not effected on the reduction of the selenate. The reduction rate increases with decreasing in pH and increasing temperature. Selenium (IV) concentration in the solution containing approximately 10 g·m-3 is decreased less than 0.3 g·m-3 at 343 K.
