Patent ID: 6849177

Claim:
A photocatalyst reaction apparatus comprising a tank used for mixing ozone formed by radiating ultraviolet rays of a short wavelength of 183 to 184 nm to air mixed with water to be treated, and at least two water tanks connected in series, on at least a part of the inner wall surface of said tanks a photocatalyst is provided through a protective layer containing lithium silicate, the water tanks further having means for introducing water to be treated, means for discharging the treated water, and means for radiating ultraviolet rays each provided at or in the water tanks, the means for radiating ultraviolet rays provided in a first water tank is means for radiating ultraviolet rays of a medium wavelength of 170 to 260 nm, and the means for radiating ultraviolet rays provided in a second water tank is means for radiating ultraviolet rays of a long wavelength of 310 to 370 nm.