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硝酸塩廃液生物処理技術の開発

Development of sodium nitrate waste fluid treatment technology by biological method

高橋 邦明 ; 目黒 義弘  ; 川戸 喜実; 柴田 勝志*

Takahashi, Kuniaki; Meguro, Yoshihiro; Kawato, Yoshimi; Shibata, Katsushi*

東海再処理施設から発生する低レベル濃縮廃液は、高濃度の硝酸ナトリウムを含んでおり、この固化体処分した場合、周辺環境における硝酸態窒素濃度が高くなる。そこで硝酸ナトリウム廃液を分解,処理する方法として生物処理技術の開発を行った。生物処理技術が抱える課題に対して、余剰汚泥焼却灰発生量の削減試験,脱窒性能の限界見極め試験を行い、以下の結果を得た。(1)焼却灰発生量は従来比1/10に低減され、廃棄体処分費低減の目途を得た。(2)脱窒性能はこれまでの4kg-N/m$$^{3}$$/dから7kg-N/m$$^{3}$$/dまで上昇させることができた。

Low level liquid waste discharged from Tokai Reprocessing Plant includes high concentration of sodium nitrate. In the case that the solidified waste are disposed under the ground, leached nitrate migrates into the environment and impacts on surround. To avoid this impact, we planned to apply the biological treatment system to reduce nitrate from this waste liquid. To solve the assignments that biological treatment technology has, we tested and obtained the results as shown below; (1) The amount of sludge ash could be cut down a tenth as much as usual. The disposal cost reduction of waste is just in sight. (2) Treatment performance could be improved up to 7 kg-N/m$$^{3}$$/d from 4 kg-N/m$$^{3}$$/d. It could be expected the more compact system by improvement of the membrane set into the biological treatment tanks.

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