PURPOSE: To make ozone easy to dissolve and to markedly enhance the absorption efficiency of ozone to raw water by preliminarily making raw water weakly acidic before absorbing ozone in the raw water.
CONSTITUTION: After raw water is supplied to a carbon dioxide mixer 2 by a pump 1, carbon dioxide is supplied to a carbon dioxide mixer 2 from the outside to make the raw water weakly acidic within the pH range of 4.0-6.5. The raw water made weakly acidic absorbs carbon dioxide to become carbonated water. Next, the raw water (carbonated water) is supplied to an ejector 3 and mixed with ozone supplied to the ejector 3 from the outside under stirring. As a result, ozone is absorbed in raw water to obtain ozonated water which is, in turn, supplied to an ozonated water storage tank 4 to be stored therein. A necessary amount of ozonated water is discharged from the discharge port 6 of the ozonated water storage tank at the time of use to be utilized.
SERIZAWA TAKAKIYO
OKAMURA AKIRA
OC ENG CO LTD