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Japan Atomic Energy . ... JAEA-Technology 2013-046 - 2 - 2.セシウム(Cs)吸着材の作製 2.1 Cs 吸着材の作製方法 放射線グラフト重合法によるCs 吸着材の作製方法は、Fig.1

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  • i

    JAEA-Technology 2013-046

    放射線グラフト重合装置を用いたセシウム吸着材の作製とフィールド試験

    日本原子力研究開発機構 量子ビーム応用研究部門 環境・産業応用量子ビーム技術研究ユニット

    笠井 昇、岩撫 暁生※1、植木 悠二、佐伯 誠一 保科 宏行※2、瀬古 典明

    (2013 年 11 月 8 日 受理)

    2011 年 3 月 11 日に発生した東日本大震災に伴う東京電力福島第一原子力発電所事故に より放出された放射性セシウムについては、半減期が長く、早期の除染が必要である。我々

    は、放射線グラフト重合法を適用して、セシウムに対して親和性が高い、リンモリブデン

    酸アンモニウムを担持した吸着材を開発した。 実験室レベルで最適化した吸着材の作製条件をもとに 150 倍程度スケールアップしたベ ンチスケール規模の重合装置により、実験室規模の 1,000 倍量に相当する吸着材を作製し、 実験室で作製したものと性能を比較評価した。また、作製した吸着材を用いて環境水中に

    溶存している放射性セシウムの吸着性能評価を福島県内でフィールド試験により行った。

    重合装置により得られた吸着材は、1ppm の安定性セシウムの水溶液を用いた吸着試験で、 90 %以上の吸着率を示した。また、吸着材を筒状のカラムに充填した吸着容量評価試験よ り、吸着材体積の 3,000 倍量の汚染水中のセシウムを吸着できることがわかった。さらに、 福島県内で実施したフィールド試験では、水中に溶存する放射性セシウムを検出限界値以

    下まで除去できることを明らかにした。 高崎量子応用研究所(駐在):〒370-1292 群馬県高崎市綿貫町 1233 ※1:博士研究員 ※2:技術開発協力員

  • ii

    JAEA-Technology 2013-046 Pilot-scale Synthesis for Radioactive Cesium Adsorbents by Radiation Graft

    Polymerization and Their Field Tests

    Noboru KASAI, Akio IWANADE※1, Yuji UEKI, Seiichi SAIKI, Hiroyuki HOSHINA※2 and Noriaki SEKO

    Environment and Industrial Materials Research Division

    Quantum Beam Science Directorate Japan Atomic Energy Agency

    Watanuki-machi, Takasaki-shi, Gunma-ken

    (Received November 8, 2013)

    On March 11th, 2011, the accidents of Fukushima Dai-ichi nuclear power plants were occurred by the Great East Japan Earthquake, and the large amount of radioactive species were spread on their circumstances. To remove their radioactive species which have long radioactive half-life from the circumstances as rapidly as possible, we developed novel radioactive cesium adsorbents containing ammonium 12-molybdophosphate, which had adsorption selectivity for cesium ion, by radiation grafting method. The bench-scale equipment 150 times as large volume as laboratory scale was established for graft polymerization. The radioactive cesium adsorbents 1,000 times as large as laboratory scale were successfully synthesized with the bench-scale equipment. At batch adsorption test for 1 ppm non-radioactive cesium aqueous solution, more than 90% cesium ion could be removed by the developed adsorbent, and at column adsorption test for the same cesium solution with up to 3,000 times as much volume as the adsorbent volume, the cesium concentration could be reduced below 1%. Moreover, the adsorption performance with radioactive cesium in environmental water was evaluated at field tests in Fukushima Prefecture. As a result, the adsorbents could successfully remove radioactive cesium dissolved in environmental water below the detection limit of radioactivity concentration. Keywords: Cesium Adsorbent, Radiation Graft Polymerization, Adsorption Test, Ammonium 12-Molybdophosphate, Field Test, Radioactive Cesium ※1 Post-Doctoral Fellow ※2 Collaborating Engineer

  • JAEA-Technology 2013-046

    iii

    目 次

    1.はじめに ······························································ 1

    2.セシウム(Cs)吸着材の作製 ············································· 2

    2.1 Cs 吸着材の作製方法 ················································· 2

    2.2 放射線グラフト重合装置による Cs 吸着材の作製 ························· 2

    2.2.1 基材の調整 ···················································· 4

    2.2.2 照射方法 ······················································ 5

    2.2.3 モノマー溶液の調整 ············································ 5

    2.2.4 グラフト重合方法 ·············································· 6

    3.Cs 吸着材の吸着性能評価 ················································ 10

    3.1 バッチ試験での評価 ·················································· 10

    3.2 カラム試験での評価 ·················································· 12

    4.Cs 吸着材を用いたフィールド試験 ········································ 14

    4.1 伊達市立富成小学校プール水の放射性 Csの吸着試験 ····················· 14

    4.2 福島大学付属幼稚園プール水の除染 ···································· 16

    4.3 飯舘村での池の水を用いた放射性 Csの吸着試験 ························· 18

    4.3.1 バッチ試験での評価 ············································ 19

    4.3.2 カラム試験での評価 ············································ 20

    5.まとめ ································································ 23

    謝辞 ······································································ 24

    参考文献 ·································································· 25

  • JAEA-Technology 2013-046

    iv

    Contents

    1. Introduction ··························································· 1 2. Production of Cesium (Cs) Adsorbent ····································· 2 2.1 Production Method of Cs Adsorbent ··································· 2 2.2 Production of Cs Adsorbent by Graft Polymerization Equipment ········· 2 2.2.1 Preparation of Base Material ····································· 4 2.2.2 Irradiation Method ·············································· 5 2.2.3 Preparation of Monomer Solution ································· 5 2.2.4 Graft Polymerization by Equipment ······························· 6 3. Performance Evaluation of Cs Adsorbent ································· 10 3.1 Evaluation by Batch Experiment ····································· 10 3.2 Evaluation by Column Test ··········································· 12 4. Field tests in Fukushima Using Cs Adsorbent ····························· 14 4.1 Adsorption Test of Radioactive Cs to Swimming Pool Water of Tominari Elementa

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