TREATMENT METHOD OF CESIUM-CONTAMINATED SOIL

PROBLEM TO BE SOLVED: To provide an effective and suitable treatment method capable of purifying cesium-contaminated soil by an efficient and more simple method in an industrial scale.SOLUTION: Cesium-contaminated soil is mixed into an acid solution and ultrasonic treatment of the mixed solution is performed to separate cesium in the contaminated soil into the acid solution. It is preferable that the ultrasonic treatment is performed while heating the acid solution mixed with the contaminated soil to a predetermined temperature (e.g. about 40 to 70°C) under atmospheric pressure. If necessary, after performing pretreatment for previously dividing the contaminated soil into coarse grains and fine grains and washing the divided grains, the treatment described above is performed for the fine grains and/or coarse grains. A nitric acid solution, an oxalic acid solution or a malic acid solution is preferably used as the acid solution. Instead of the acid solution, water can also be used.