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INSOLUBILIZATION OF HEAVY METALS IN VOLCANIC DEPOSIT WITH MAGNESIUM OXIDE INSOLUBILIZER

  • DOTE Yutaka
    宮崎大学 工学部社会環境システム工学科
  • ITO Kenichi
    宮崎大学 国際連携センター
  • SEKITO Tomoo
    宮崎大学 工学部社会環境システム工学科
  • OBANA Seiichi
    宇部マテリアルズ株式会社 カルシア関連事業部
  • FUJII Shingo
    宇部マテリアルズ株式会社 カルシア関連事業部

Bibliographic Information

Other Title
  • 酸化マグネシウム系不溶化材による火山噴出物由来河川堆積物の不溶化処理に関する研究

Abstract

<p> To evaluate of the effect of MgO on insolubilizaiton of heavy metals in volcanic deposit, the raw deposit sampled from five points in Akako River in Miyazaki prefecture, Japan was treated with MgO, and leaching test, pH dependence test and sequential extraction test were performed. B and As were leached from the raw deposit and the concentrations exceeded the Environmental Quality Standards for soil. By adding MgO of 6% into the raw deposit, leaching concentrations of As, B, Cd, F and Pb satisfied the Environmental Quality Standards for soil. The results of pH dependence test indicated that MgO treatment could be highly effective at a pH of 2 for Cd and F; however, it was much less effective less than a pH of 7 for B, As, T-Cr and Pb. It was suggested that As and B could be adsorbed on MgO, Mg(OH)2 and Fe(OH)3 to be insolubilized.</p>

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