| 摘要 |
PROBLEM TO BE SOLVED: To provide a treatment system developing an excellent selenium removing effect even with respect to wastewater having a low concentration of selenium. SOLUTION: This removing apparatus of selenium in wastewater has an electrolytic cell (a) having electrodes wherein a ferrous material is used at least in an anode and applying a voltage of 8-20 V across the electrodes to pass a current through selenium containing wastewater in the electrolytic cell, a means (b) for adding sulfuric acid to the selenium-containing wastewater to adjust the pH of the watewater to 1-2.5, a pH measuring means (c) for measuring the pH of the wastewater, a storage tank (d) for storing the wastewater drawn out of the electrolytic cell after energization, a means (e) for adding alkali to the storage tank to neutralize the wastewater, a pH measuring means (f) of the neutralized wastewater and a means (g) for separating the sediment drawn out of the electrolytic cell and the storage tank to dehydrate the same and is adapted to a selenium removing method not only to adjust the pH of the wastewater to 2.5 or below but also to apply the voltage of 8-20 V across the electrodes to coprecipitate selenium along with an iron hydroxide sediment to preferably reduce the concentration of selenium in the wastewater to 0.01 mg/L or below. COPYRIGHT: (C)2005,JPO&NCIPI
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