| 摘要 |
PURPOSE:To reduce an organochlorine compound forming amount, by performing chlorination in the pre-chlorination of a water treatment process in a level lower than a succeeding point to convert ammoniacal nitrogen to a chloramine form before performing ozonation. CONSTITUTION:The ozone injection control in an ozone reaction tank 19 is performed by measuring the concn. of residual ozone in treated water collected from the water sampling point 20 after the ozone reaction tank 19 by a residual ozone densitometer 21 to input the measured value to a calculator 22. In the calculator 22, a proper ozone injection ratio is calculated from the deviation of the set value of residual ozone concn. and the actually measured value in a process and, by applying frequency control to an ozone generator 23, a prede termined amount of ozone is generated to be injected in the ozone reaction tank 19. Then, by controlling the concn. of residual ozone at the water sampling point 20, chloramine decomposing reaction is performed in the ozone reaction tank, and sterilization and disinfection are also performed perfectly.
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