| 摘要 |
PROBLEM TO BE SOLVED: To efficiently feed a chlorine compd. and to perform sterilization of water when water is cleaned by means of physicochemical action in cleaning water. SOLUTION: In a circulation flow path 9, a circulation means 12 for circulating water, an aggregating of means 13 for aggregating suspended substances in water, a filtration means 14 for filtering the suspended substances in water, an electrolysis means 15 for feeding a chlorine compd. by electrolyzing water, an electric source 16 for applying a const. electric current to the electrolytic means 15, a detecting means 17 for detecting an electric voltage value applied to the electrolytic means 15 by the electric source 16, and a control means 18 for controlling the electrolysis means 15 in accordance with the result of the detecting means 17 are provided. It is possible thereby to obtain a definite sterilization effect regardless of quality of water.
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