| 摘要 |
PROBLEM TO BE SOLVED: To provide a treating method of waste cleaning liquid, in which the waste liquid used for cleaning a hydrothermal reaction treatment system is detoxified on a site by mixing the waste liquid with a liquid to be treated and subjecting them to a hydrothermal reaction treatment. SOLUTION: In a method for subjecting a liquid to be treated to hydrothermal reaction treatment using a hydrothermal reaction system, a pretreatment for removing inorganic substances from cleaning waste liquid which has been used for cleaning a tank 1 for liquid to be treated is carried out in a first pretreatment device 11, a pretreatment for removing inorganic substances from cleaning waste liquid which has been used for cleaning a preheater 4 is carried out in a second pretreatment device 13, and the cleaning waste liquid pretreated in the first and second pretreatment devices 11 and 13 is mixed with a liquid to be treated and then subjected to a hydrothermal reaction treatment.
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