| 摘要 |
PROBLEM TO BE SOLVED: To provide an ozone injection control method which enables rapid response to the variation in quality of water to be treated, proper maintenance of quality of treated water and also reduction in ozone injection amount. SOLUTION: In a process for injecting gaseous ozone into water to be treated to treat the water, this control method for controlling the ozone injection comprises subjecting the flow rate G (Nm3/h) and the concentration C03 (g/Nm3) of gaseous ozone, which are measured by using their respective measuring instruments 8 and 9 placed in an ozone injection section, to FF(feed forward) control in such a way that correlation of the absorbance C0E at a 260 nm UV wavelength (with a 5 cm cell) and the flow rate L (L/h) of the water to be treated, which are measured by using their respective measuring instruments placed in a section preceding the ozone injection section, with the flow rate G (Nm3/h) and concentration C03 (g/Nm3) of the gaseous ozone, meets the relational expression (G×C03)/(L×C0E)=C (wherein C is a constant within the range of 4.5-5.5).
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