| 摘要 |
PROBLEM TO BE SOLVED: To rapidly treat a waste water having high density of contaminants while maintaining the effect to completely change org. matter into inorg. matter which is the advantage of a photocatalyst, by treating the waste water by ozone in the presence of a photocatalyst and under irradiation of light of specified or shorter wavelengths. SOLUTION: When a glass tube (d) coated with a photocatalyst is filled with a waste water, the waste water is made in contact with the photocatalyst applied on the inner surface of the glass tube (d). Also the waste water is irradiated with light of <=290nm wavelengths from a low-pressure mercury lamp (1a). In this state, the waste water is brought into contact with ozone introduced from an ozone injecting port (b) to decompose the contaminants in the waste water. For example, when 150ml acetic acid soln. having 2×10<-4> mol/l concn. is supplied and irradiated with light while ozone is introduced into the liquid by 0.5g/hr rate, 91% of the soln. can be decomposed in 15min. The photocatalyst includes titanium dioxide, zinc oxide, zirconium oxide, tungsten oxide, etc.
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