SOIL DECONTAMINATION TREATMENT METHOD

PROBLEM TO BE SOLVED: To provide a soil decontamination treatment method capable of decontaminating contaminated soil accumulating radioactive substances.SOLUTION: The soil decontamination treatment method for decontaminating contaminated soil accumulating radioactive cesium includes: a decontamination step of decontaminating the contaminated soil and separating it into a removed object and treated soil; and a plant removal step of separating the contaminated soil into plants mixed in the contaminated soil and plant removed soil from which the plants are removed. In this case, the decontamination step may include a primary decontamination step of performing decontamination by wet classification of a primary mixture generated by mixing and agitating the contaminated soil and water, and then separating the primary mixture into primary treated soil whose grain size is equal to or larger than a prescribed grain size and a primary removed object whose grain size is smaller than the prescribed grain size.