METHOD FOR REMOVING SELENIUM AND APPARATUS FOR REMOVING SELENIUM

摘要

This method for removing selenium comprises: a valence change step wherein an oxidant is added into waste water from a facility for gasifying a fuel containing selenium in a reducing atmosphere, so that the valence of the selenium is changed by oxidizing the selenium; and a solid-liquid separation step wherein a flocculant is added into the waste water so that a flocculated material containing the selenium, the valence of which has been changed in the valence change step, is formed, and then the flocculated material is subjected to solid-liquid separation.