| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method for removing selenium, in each of which a resin or the like is used for adsorbing selenium so that selenium is removed from waste water or the like at a low cost.SOLUTION: The apparatus 1 for removing selenium includes: a sulfide method reaction tank 4 in which a sulfidizing agent S is added to selenium-containing waste water W1 so that heavy metals contained in the selenium-containing waste water are insolubilized to obtain sulfides; a barium salt reaction tank 6 in which barium salt B is added to the waste water W2 discharged from the sulfide method reaction tank to insolubilize a sulfate ion, a selenate ion and a selenite ion; a barium salt reaction tank 8 for subjecting the waste water discharged from the barium salt reaction tank to solid-liquid separation; and a resin column 11 for selectively adsorbing the selenium remaining in a filtrate F1 separated by the solid-liquid separator. The apparatus for removing selenium can further include a chemical injection control unit for controlling the amount of the barium salt to be added into the barium salt reaction tank according to the concentration of the sulfate ion contained in the filtrate separated by the solid-liquid separator. |
