| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce operating cost for the whole processes by separating objects into objects to be removed suitable for an ozone treatment process and objects to be removed suitable for a sterilization process and achieving target water quality by the processes. Ž<P>SOLUTION: A liquid treatment apparatus includes an ozone generator 3 for injecting ozone gas which reacts with water to be treated in an ozone contact tank 2, a colorimeter 8 in a passage connected to the ozone contact tank 2, a chlorine injector 11 for injecting a chlorine agent into an ultraviolet irradiation tank 6 equipped with an ultraviolet lamp and connected to the passage or into the passage, and an input means 10 for performing input into a controller 9 controlling the ozone generator 3, the ultraviolet lamp, or the chlorine injector 11. The output of the ozone generator 3 is controlled from a deviation between the target value of a first water quality item from the input means 10 and a value of the first water quality item measured by a water quality measuring meter. The output of the ultraviolet lamp or the injection rate of the chlorine agent of the chlorine injector 11 is controlled from the target value of a second water quality item from the input means 10 by a relationship between the first water quality item and ultraviolet irradiation or a relationship between the first water quality item and the injection rate of the chlorine agent. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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