| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultraviolet sterilizing method and apparatus for certainly and efficiently sterilizing microorganisms such as pathogenic microorganisms in water. SOLUTION: An ultraviolet sterilizing apparatus 10a has a reaction device 1 equipped with an ultraviolet irradiation means 2a for irradiating microorganisms in a liquid to be treated with ultraviolet rays, a means 3 for measuring the concn. of a suspended substance in the liquid to be measured, a means 4 for regulating the stagnation time of the liquid to be treated within the reaction device and a control means 5 for operationally processing the output signal 11 from the means 3 for measuring the suspended substance in the liquid to be treated to output a signal 12 to the means 4 for regulating the stagnation time of the liquid to be treated in the reaction device and this apparatus 10a is used to control the irradiation quantity of ultraviolet rays corresponding to the concn. of the suspended substance in the liquid to be treated to sterilize pathogenic microorganisms in the liquid to be treated.
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