| 摘要 |
PROBLEM TO BE SOLVED: To improve a system and a method for treating water for decomposing a difficult-to-decompose organic matter in water by an oxidation promotion treatment utilizing ozone/ultraviolet rays. SOLUTION: The system for treating water is provided with an ozone addition means (an ejector 3 to which an ozone generator 8 is connected), an ultraviolet irradiation means 4, and a gas/liquid separating vessel 5 having a pressure adjusting means 6 and a liquid level adjusting means 7. An unreacted ozone is separated from a mixed fluid after irradiating the ultraviolet rays in the gas/liquid separating vessel 5, and a pressure of an ozone/raw water mixed fluid in the ultraviolet irradiation means 4 is stabilized by regulating the pressure of the gas separated in the gas/liquid separating vessel 5 and the liquid level of the treatment water. As a result, the oxidation promotion treatment can be stably performed, and the unreacted ozone after treatment can efficiently be reused at low cost.
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