| 摘要 |
PROBLEM TO BE SOLVED: To lower initial cost and running cost and to improve total organic carbon decomposition efficiency by arranging plural sets in each of which a low pressure ultraviolet irradiation device and an ion exchange device are arranged in order along a flow passage. SOLUTION: By using two or more sets each of which consists of a low pressure ultraviolet irradiation device for irradiating 184.9 mm ultraviolet rays and an ion exchange device, total organic carbon concentration is effectively reduced. A first treating system is constituted so that a reverse osmosis membrane device 1, a reverse osmosis membrane device 2, and a vacuum deaerator 3 of gaseous N2 intrusion type are connected. And a second treating system is constituted so that a low pressure ultraviolet irradiation device 4a and a mixed bed ion exchange device 5a, and a low pressure ultraviolet irradiation device 4b and a mixed bed ion exchange device 5b having the same specification as the former are connected. By using plural stages of combination of the low pressure ultraviolet irradiation device and the ion exchange device, at the prestage, organic matter is removed as organic acid, and at the poststage, organic matter that has not been removed at the prestage can be removed as organic acid and gaseous CO2.
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