Thermal Decomposition of Woody Wastes Contaminated with Radioactive Materials using Externally-Heated Horizontal Kiln

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  • Iwasaki Toshiyuki
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • Kato Shigeru
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • Kodera Yoichi
    National Institute of Advanced Industrial Science & Technology (AIST)
  • Hatta Akimichi
    OSTRAND Corp.
  • Kikuzato Masahiro
    Engineering Department, Civil Engineering Division, Tekken Corporation
  • Yamasaki Akihiro
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • Ito Takuya
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • Suzuki Seiichi
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • Kojima Toshinori
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University

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Other Title
  • 外熱式水平回転円筒炉を用いた放射性物質を含有する木質廃棄物の熱分解処理
  • ソト ネツシキ スイヘイ カイテン エントウロ オ モチイタ ホウシャセイ ブッシツ オ ガンユウ スル キシツ ハイキブツ ノ ネツ ブンカイ ショリ

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Thermal decomposition experiments of woody wastes contaminated with radioactive materials were conducted using an externally-heated horizontal kiln in the work area for segregation of disaster wastes at Hirono Town, Futaba County, Fukushima Prefecture. Radioactivity was not detected in gaseous products of thermal decomposition at 923 K and 1123 K after passage through a trap filled with activated carbon. The contents of radioactive cesium (134Cs and 137Cs) were measured in the solid and liquid products of the thermal decomposition experiments and in the residues in the kiln after all of the experiments. Although a trace amount of radioactive cesium was found in the washing trap during the start-up period of operation at 923 K, most of the cesium remained in the char, including the residues in the kiln. These results suggest that most of the radioactive cesium is trapped in char particles and is not emitted in gaseous form.

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