JP JP2004209396A
<P>PROBLEM TO BE SOLVED: To provide a water sterilizing and purifying system using ultraviolet rays capable of certainly killing bacteria belonging to the genus Legionella, or the like, to perform purifying treatment in a circulating route for circulating bath water, or the like. <P>SOLUTION: An ultraviolet irradiation device 1, which is constituted so that ultraviolet lamps 12 for emitting ultraviolet rays with a wavelength region of 184.9-253.7 nanometer are attached so as to be positioned within an ultraviolet irradiation tank 11 having an inflow port 13 and an outflow port 14, is incorporated in a water circulating route at an appropriate position. <P>COPYRIGHT: (C)2004,JPO&NCIPI
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