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Report No.

Study on volume reduction of cesium contaminated soil by magnetic separation; Treatment of organic matter

Nishimoto, Yuki*; Horie, Hiroki*; Akiyama, Yoko*; Nishijima, Shigehiro*; Mitsui, Seiichiro  ; Umezawa, Katsuhiro ; Kato, Mitsugu; Okada, Takashi ; Sekiyama, Tomio*

By the accident of Fukushima Daiichi Nuclear Power Plant, a large amount of soil was contaminated by radioactive cesium. We developed a new physical treatment method using magnetic separation that can separate high-dose 2:1 type clay minerals from contaminated soil selectively. However, there is an issue that it is difficult to capture 2:1 type clay minerals efficiently, because clay minerals form aggregations with soil organic matter. Our previous study indicated that aggregates can be dispersed effectively by treatment of organic matter with K$$_{2}$$CO$$_{3}$$ solution. The purpose of this study is to assess the effect of the organic matter treatment on efficiency improvement of magnetic separation for 2:1 type clay minerals. The result showed that the possibility of effective treatment method for the soil rich in organic matter like agricultural soil by combination of the pretreatment with K$$_{2}$$CO$$_{3}$$ solution and magnetic separation.



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