To provide a method for efficiently, rapidly and cost effectively removing selenium in the form of metal by an electrolysis method from a waste liquid contg. selenium and more particularly hexadic selenium.
This method removes the dissolved selenium from the waste liquid contg. the selenium. In such a case, the waste liquid is adjusted to pH ≤2.5 and is electrolyzed by using a porous electrode material for cathode 1 at 40 to 100°C while passing the waste liquid contg. the selenium through the inside of the cathode electrode, by which the contact area of the liquid and the cathode 1 per unit volume of an electrolytic cell is increased and a sufficient electrolyte reaction is effected. The selenium ions are thereby removed in the form of the metal. In another embodiment, an electrode material having many pores is used for anode 2 and plural pieces of the cathodes 1 and the anode 2 are alternately disposed in the cell. The waste liquid contg. the selenium is then electrolyzed while the liquid is successively passed in the cathode and anode electrodes.
TATEIWA HIRONORI
NAGAMOTO HIROYUKI
KUBO HIROMI
