| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a system for decontaminating an object contaminated by a radioactive material that can reduce the concentration of radioactive cesium to 100 Bq/kg or less, included in a decontamination object contaminated by a radioactive material.SOLUTION: A system for decontaminating an object contaminated by a radioactive material comprises: a washing liquid storing tank 2 for conditioning and storing a natural surfactant washing liquid: a washing machine 4 for performing cavitation jet washing using a natural surfactant as a washing liquid; a collection tank 6 for collecting the natural surfactant washing liquid and a decontamination object; a nano-bubble washing liquid storing tank 8 for conditioning and storing a carbonic acid nano-bubble washing liquid; a washing machine 9 for performing cavitation jet washing using a carbonic acid nano-bubble water as a washing liquid; a classification machine 14 for classifying the decontamination object and suspension water; a washing waste liquid storing tank 15 for collecting the suspension water; and a suspension water treating machine 16 for separating deposit from water to be treated by aggregating, adsorbing, and precipitating radioactive materials and fine particles in the suspension water by using an aggregating, adsorbing, and precipitating agent. The cavitation jet washing is performed by using the natural surfactant washing liquid, and then by using the carbonic acid nano-bubble washing liquid. |
