Elution of mercury (Hg) from fly ashes and the stabilized fly ashes of municipal waste plant were examined by the leaching test prescribed in the Japanese Environmental Agency Notification No. 13, 1973 (JLT-13). On elution, a sample of the stabilized fly ash yielded over 0.005 mg/L of Hg, whereas that of the unstabilized ash yielded less than 0.0005 mg/L of Hg.rnThen, these samples were mixed with several chelating agents, and the Hg elution process was studied. Experimental results indicate that the elution yield of Hg from the stabilized fly ash depends on the Hg content in the fly ash and the combination of chelating agents used.%一般廃棄物焼却飛灰とそのキレート処理飛灰の環苦13号溶出試験を実施したところ，飛灰溶出液でHgが不検出にもかかわらず，キレート処理飛灰の溶出液から埋立判定基準0．005mg／L前後の濃度でHgが検出された施設があった．飛灰とキレート剤の組み合わせを替えた混練試験を実施し，Hgの溶出要因を検討した結果，キレート処理飛灰からのHgの溶出濃度と飛灰のHg含有量及びキレート剤の種類との関連が示された．
展开▼
