| 摘要 |
PROBLEM TO BE SOLVED: To obtain treated water having good water quality by efficiently decomposing even hardly decomposable org. matter by forming a strongly acidic substance in the process of oxidative decomposition of the org. matter and executing exidatively decomposing reaction while keeping a specified pH value in the case when org. matter- containing waste water is subjected to oxidation treatment. SOLUTION: The org. matter-containing waste water is introduced to an oxidation reaction tank 1 by a piping 11, and alkali is added from a piping 12 to adjust pH in >=10 and also hydrogen peroxide is added. An ozone injecting piping 14 and a gas-liq. mixing device 2 are provided at a circulation piping 13 provided with a pump P provided at the oxidation reaction tank 1, and ozone is injected to circulating liq. by the injecting piping 14, and the oxidative decomposition using the ozone with the hydrogen peroxide is executed under alkaline condition at the oxidation reaction tank 1. At this time, the oxidative decomposition is executed under the alkaline condition of >= pH 10. In this way, even the hardly decomposable org. matter such as an alkyl sulfoxide forming the strongly acidic substance at the oxidative decomposition stage is efficiently decomposed oxidatively.
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