| 摘要 |
PURPOSE: To suppress the generation of hydrogen peroxide and to effectively oxidize and decompose org. matter by adding the ozonized water obtained from an electrolytic ozonized water producing device to the water to be treated and adding the water passed through an anion-exchange resin or the hydroxide of an alkali metal to make the water alkaline. CONSTITUTION: The ozonized water of an electrolytic ozonized water producing device is added to the water to be treated from an ozonized water inlet 5 directly before a UV irradiation device 8. In this case, the water is regulated to pH 8-9 on this side of the inlet 5 by the water passed through an anion-exchange resin or the aq. alkali metal hydroxide soln. adding device 7. The org. matter in the water is then allowed to react with ozone by UV of the irradiation device 8 and decomposed into org. acid or carbonic acid. The water contg. H<+> ion and H free radical is added from a water inlet 6 of the electrode counter to an ozone generating electrode to return the water to neutral. The org. acid, carbonic acid, excess OH<-> ion and H<+> ion are removed in a mixed-bed ion- exchange resin tower 9. The by-produced hydrogen peroxide is removed in the water without using an activated-carbon treatment or a pH regulating chemical. |
