| 摘要 |
PROBLEM TO BE SOLVED: To provide a water treatment system capable of preventing excessive dosage of an oxidation type sterilant, caused by sensitivity reduction of an ORP sensor, and efficiently preventing contamination of circulation water during stop of chemical agent feed by the oxidation type sterilant.SOLUTION: A water treatment system 1 comprises: a first chemical agent injection device 60 for injecting an oxidation type sterilant W3 to circulation water W2; an ORP sensor 133 for detecting water quality of the circulation water W2; a second chemical agent injection device 64 for injecting a non-oxidation type sterilant W4 to the circulation water W2; a first chemical agent injection control part 111 for performing first chemical agent injection control for injecting the oxidation type sterilant W3 on the basis of the detection value of the ORP sensor 133; a first chemical agent injection stop part 112 for stopping injection performed by the first chemical agent injection device 60 when a continuation time of chemical agent injection by the first chemical agent injection device 60 exceeds a preset first period; and a second chemical agent injection control part 113 for, when detecting stop of injection of chemical agent by the first chemical agent injection device 60, by the first chemical agent injection stop part 112, starting second chemical agent injection control for injecting the non-oxidation type sterilant W4.SELECTED DRAWING: Figure 2 |
