| 摘要 |
PROBLEM TO BE SOLVED: To reduce rinsing time and the used quantity of rinsing water while complete washing can be performed by injecting gaseous CO2 and/or carbonated water to water used in a rinsing process. SOLUTION: In a washing method in which water and acidic, alkaline detergents are alternately fed and pre-washing, washing, and rinsing processes are performed in this order, a device for injecting gaseous CO2 and/or carbonated water into water used in the rinsing process is arranged. This device is provided with pH meters 1 and 2, a gaseous CO2 cylinder, a line mixer, a liquid transfer pump, and a heat exchanger. The pH meter 1 is installed at a waste water outlet of a washing object device shown as a production line to check pH of waste water, and for example, if pH becomes 8-9.5, the termination of washing is detected to stop the injection of gaseous CO2 by control equipment. The pH meter 2 monitors the variations in pH of water into which gaseous CO2 is injected to agitate and mix them by a line mixer and into which gaseous CO2 is blow and checks its abnormality occurrence (such as, the gaseous CO2 cylinder becoming empty).
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