Removal and Elution of Arsenic (III) ion from Artificial Waste Water by Adsorbent containing Fe (III)

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  • LIU Kejun
    Former, The 21st century COE program, Mechanical Systems Innovation, The University of Tokyo(Present at Dowa Environmental Management Co., Ltd.)
  • FUJITA Toyohisa
    Dept. of Geosystem Engineering, The University of Tokyo
  • MATSUO Seiji
    Dept. of Geosystem Engineering, The University of Tokyo
  • SADAKI Jun
    Dept. of Geosystem Engineering, The University of Tokyo
  • SHIBAYAMA Atsushi
    Faculty of Engineering and Resource Science, Akita University
  • NAKANISHI Koji
    Nittetsu Mining Co., Ltd., Japan

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Other Title
  • Ｆｅ（ＩＩＩ）吸着剤による人工廃水からのヒ素（ＩＩＩ）の除去および溶出
  • Fe 3 キュウチャクザイ ニ ヨル ジンコウ ハイスイ カラ ノ ヒソ 3 ノ ジョキョ オヨビ ヨウシュツ

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Abstract

In this study an arsenic plate adsorbent was prepared in two stages. Initially a Fe(III) bearing high molecular solid particle adsorbent was made from a ferric salt. Finally the solid particle was evenly spread on a plastic plate by using a special treating process to become an arsenic plate adsorbent. The mechanism of arsenic adsorption on this adsorbent is a kind of ion exchange process. It can adsorb both arsenic(III) and arsenic(V) from the wasted water. The arsenic removal was about 99%. In a solution contains 20mg/L arsenic at pH6. 99% of arsenic was removed in 2 hours by a l0g/L solid particle adsorbent and the final arsenic concentration was reduced to below 0.05mg/L arsenic. Furthermore, it was found that the re-adjustment of solution pH and temperature might cause the elution of arsenic and let it return back to the solution. The activity of the adsorbent was not reduced after elution. Thus, it can be re-used several times without producing the contaminated mud. The cost of the contaminated mud treatment can be reduced or completely avoided. The recovery and recycling of arsenic metal for re-use are feasible. Under the condition of high alkali solution (pH13), 363K and 2 hours, a plate adsorbent was re-used for five cycles with the arsenic elution was 80-99%.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 121 (6), 240-245, 2005

    The Mining and Materials Processing Institute of Japan

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