| 摘要 |
PURPOSE:To regenerate active carbon in such a way that it has adsorption ability like unused active carbon, by heat-treating active carbon having reduced adsorption ability, washing it with a dilute aqueous solution of hydrochloric acid. CONSTITUTION:Hydrochloric acid 1 is blended with water in the preparation tank 3 with stirring to make a dilute aqueous solution of hydrochloric acid having a given concentration. Active carbon having reduced adsorption ability is heat- treated, and fed to the treating tank 5. The dilute aqueous solution is added to the tank 5, the active carbon is blended with the dilute aqueous solution of hydrochloric acid with stirring, washed, allowed to stand, reblended with stirring, and the waste dilute aqueous solution of hydrochloric acid is taken out from the central outlet 6. This washing operation is repeated plural times, and finally total amount of the waste aqueous solution of hydrochloric acid is taken out from the bottom outlet 7. Finally, water is fed from the pipe 8 to the tank if necessary, and water is taken out from the top outlet 9 while washing hydrochloric acid in the active carbon with it. The active carbon after treatment is packed into the column 12 for active carbon treatment by N2 10 and it is reused. The waste aqueous solution of hydrochloric acid is neutralized with NaOH and discharged.
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