Lead Removal from Contaminated Soil by Sequential Application of Chlorination by Mixed Salt and Warm Water Extraction

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Other Title
  • 混合塩による塩化と温水浸出の連続処理による鉛汚染土壌の浄化
  • コンゴウエン ニ ヨル エンカ ト オンスイ シンシュツ ノ レンゾク ショリ ニ ヨル ナマリ オセン ドジョウ ノ ジョウカ

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Abstract

In recent years, an increasing number of urban soil contamination cases has been found during redevelopment of former factory sites. Hydroclassification technique, separating heavily contaminated fine soil particles from contaminated sites, is one of the economical remediation techniques for contaminated soil by heavy metals, but the separated fine soil particles are generally landfilled because of the difficulty in removing heavy metals strongly adsorbed on them.<BR>In the previous study, the authors have investigated the mechanism and the optimum condition of chlorination-volatilization technique to eliminate heavy metals from inorganic waste and found it was needed to heat up around 1273K. <BR>In this paper, a new remediation technique for lead contaminated fine soil particles is proposed. This technique is composed of chlorination and subsequent warm water extraction. In the chlorination step, water-insoluble lead complex is chlorinated to be water-soluble lead chloride without volatilization, by heating the soils with MgCl2-CaCl2-KCl salt mixture at relatively low temperature. By subsequent warm water extraction, lead chloride is leached out. Effects of chlorination conditions, such as time, temperature, composition of the salt and added salt ratio, on lead behavior were investigated. It was proved that lead concentration could be reduced to be below Japanese environmental standard.

Journal

  • Journal of MMIJ

    Journal of MMIJ 124 (4/5), 254-259, 2008

    The Mining and Materials Processing Institute of Japan

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