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高放射能汚染土壌の界面化学的分散制御; 高速せん断流解砕洗浄による再生土化

Reclamation of highly radioactive contaminated soil by a combination of chemical interface controlled dispersion and high-speed shearing washing

石山 新太郎; 神谷 昌岳*; 近藤 充記*; 比氣 明典*

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

最高570,000Bq/kgを越える高放射能汚染土の福島県下の代表的な校庭土,原野土並びに県道脇土の界面化学的分散制御と高速せん断流解砕による土壌洗浄実験を行い、土壌特性と洗浄・濃縮・減容化効果について下記結論を得た。(1)3種類の原土壌に対して60分間程度の解砕洗浄を行うことにより60-95%の洗浄率が期待できる。(2)解砕洗浄後の再生土(8,000Bq/kg以下)の回収率は3種類原土壌において60-82wt.%であり、特に、原野土において500Bq/kg$$times$$33wt.%の低線量化での回収を達成した。(3)濃縮度の固形化による減容化(最高260,000Bq/kg)において60-85wt.%を達成した。(4)本解砕洗浄技術により汚染土壌に含まれる全FP量の90%以上のものが濃縮ケークとして回収可能である。(5)高放射能汚染土壌の主要FP捕獲鉱物相は校庭土においては金雲母等の層状ケイ酸塩類鉱物であり、原野土や県道脇土においてはモルデナイトである。

Chemical interface controlled dispersion and high speed shearing (CDS) washing verification test of high level radioactive contaminated soil over 570,000 Bq/kg was conducted using three kinds of radioactive contaminated soils of school ground, moor and road in Fukushima and the following results was obtained. (1) Washing rate of three kinds of contaminated soils reached up to 60-98% after 60 minutes CDS water washing. (2) Recovered amounts of reclamation soils of three type of soils(less than 8,000 Bq/kg) were 60-82 wt.%. Especially, 506 Bq/kg $$times$$ 33wt.% was achieved in the case of contaminated soil of moor. (3) Volume reductions of 60-85wt.% were achieved in every case of contaminated soils. (4) Contain recoverable quantities of total radioactive sources contained in soils was over 90%. (5) Main FP trapping minerals contained in contaminated soil of school ground is lamellar silicate and that of moor and road is mordenite.

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パーセンタイル:15.82

分野:Engineering, Chemical

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