粉砕したセメント固化体からの重金属の溶解に関する研究

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  • Dissolution of Heavy Metals from Ground Materials Solidified with Portland Cement
  • フンサイ シタ セメントコカタイ カラ ノ ジュウキンゾク ノ ヨウカイ ニ

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To clarify the dissolution of heavy metals from cement solidified waste under landfill layer conditions, we conducted the serial batch extraction from ground materials that were solidified with Portland cement and included cadmium and lead chloride. Distilled water or acetic acid was used as extraction solvent. The ground materials were intermittently exposed to air or 50% of CO2 between the extraction.<BR>The dissolution of cadmium followed the hydroxide/carbonate solubility equilibrium, although the dissolution of lead did not. When the ground materials were put in contact with a low pH solution, cadmium dissolved rapidly and wholly, and lead for a long period. When the ground materials were exposed to CO2, both of the metals formed carbonates; cadmium dissolved for a long period, and lead scarcely at all. These results showed that the landfilling of cement solidified wastes over incineration residues and incombustible wastes was effective to avoid heavy metal leaching.

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