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Report No.

New combination washing approach of chemical interface controlled dispersion and high-speed shearing washing techniques for radioactive contaminated soil; 1st report of field test in Fukushima

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*

Contaminated soil washing test was implemented in Fukushima for the purpose of performance verification and set-up of engineering database for construction of contaminated soil washing plant. Chemical interface controlled dispersion approach and high-speed shearing washing techniques were applied to wash the contaminated soil over 10000 Bq/kg and the following results were obtained in this first field test (1) Remarkable washing performance was achieved under the combination of dispersion and high-speed shearing washing conditions with bead cracking technique in the particle grain size group over 0.5 mm and enhanced by ceramic bead addition. (2) Well-ordered structural refinement and cumulation of the contaminated soil particle groups with strong FP confinement were observed at the particle size of 0.5 to 10 $$mu$$m after washing the contaminated soil particle group under 0.5 mm, and sieve classification technique can be applied for elective elimination of this soil particle groups.



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