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Waste management in a Hot Laboratory of Japan Atomic Energy Agency, 2; Condensation and solidification experiments on liquid waste

原子力機構のホット施設における廃棄物管理,2; 液体廃棄物の濃縮,固化試験

渡部 創; 小木 浩通*; 柴田 淳広; 野村 和則

Watanabe, So; Ogi, Hiromichi*; Shibata, Atsuhiro; Nomura, Kazunori

STRADプロジェクトの一環として、RO膜装置を用いた放射性廃液の濃縮試験を実施した。溶液中のアンモニウムイオンが濃縮され、廃液中の濃度を目標値である100ppmより低下させることに成功した。水相及び有機相廃液の固化試験も合わせて実施し、それぞれセメント又は凝固剤を添加することで固化することに成功した。しかし長期保管の観点からは添加材の最適化が必要であることが分かった。

As a part of STRAD project conducted by JAEA, condensation of radioactive liquid waste containing various chemical compounds using reverse osmosis (RO) membrane filter was examined for efficient and safety treatment of the liquid wastes accumulated inside hot laboratories. NH$$_{4}$$$$^{+}$$ ion in the feed solution was successfully concentrated, and NH$$_{4}$$$$^{+}$$ ion involved in the effluents became lower than target value; 100 ppm. Solidification of simulated aqueous and organic liquid wastes was also tested. Those liquids were successfully solidified by adding cement or coagulants. Nevertheless, optimization in materials for confinement of chemicals is required for long time storage of the final solidified wastes.

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