有害金属吸着機能を有する新規多孔質コンクリートの開発  [in Japanese] DEVELOPMENT OF THE NOVEL POROUS CONCRETE TO REMOVE VARIOUS METAL IONS IN WATER ENVIRONMENT  [in Japanese]

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Abstract

先の東日本大震災では,海域環境にも負の影響をもたらし,多くの水産資源生産力の低下を招いている.特に,海底に存在する有害金属イオンの海域環境からの除去および流出の抑制は最重要課題であり,適切な浄化および処理技術の開発が望まれている.<br> 本研究は,焼成骨粉(HAP)を紛体として,産業副産物(鉄鋼スラグ)を骨材とした多孔質コンクリートを製作し,底質中に含まれる有害金属類を吸着かつ安定不溶化可能な底質改善技術の開発を目的とした.同時に,吸着した金属類の中から有用な物質を再資源化する技術も検討した.

 Many harmful substances are hidden around us. Waters and soils polluted with harmful metal ions are particularly dangerous to the living organisms. A large amount of harmful metal ions might be diffused in the water environments when the great earthquake occurred in the Eastern Japan in March 2011. The purpose in the present study is to verify the removal of various metal ions from wastewaters in the water environments by the porous concrete containing baking bone dust (mainly natural hydroxyapatite; HAP) and steel slag as a industrial by-product. The porous concrete showed more than 10N/mm<sup>2</sup> strength and 30% air space rate. We investigated the removal of various metal ions from the artificial wastewater by the porous concrete. As a result, the porous concrete containing 10% baking bone dust efficiently absorbed lead ion, cadmium ion, copper ion, ferric ion and chromium ion. Manganese ion, nickel ion and strontium ion were also moderately absorbed in the porous concrete. Moreover, we examined the absorption of ferric ion and manganese ion eluted from the bottom sediment in Yashima-bay of Kagawa prefecture. The porous concrete significantly absorbed metal ions eluted from the bottom sediment. To confirm the binding ability of the porous concrete toward metal ions in real sea, the amounts of metal ions bound to the porous concrete were measured after placement of the porous concrete in Yashima-bay. As a result, 2-3years later of the placement of the porous concrete, the efficient bindings of lead ion, cadmium ion, copper ion, ferric ion, manganese ion and zinc ion to the porous concrete were observed. These results suggest that the porous concrete containing baking bone dust seem to be available to remove metal ions from the water environments. Also, the useful metal ions absorbed in the porous concrete can be recovered easily with acid treatment.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 68(2), I_570-I_575, 2012

    Japan Society of Civil Engineers

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