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Leaching mechanisms of heavy metals from fly ash stabilised soils

机译：粉煤灰稳定化土壤中重金属的淋溶机理

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摘要

Fly ash is an industrial waste material that is repurposed as a soil stabiliser worldwide. In Thailand, many ground improvement projects utilise mixtures of cement and fly ash to stabilise weak soils. In this study, leaching mechanisms of arsenic, chromium, lead, and zinc from cement and fly ash stabilised soils were investigated in the laboratory. Leaching tests were performed, with different leachants and pH conditions, on cement and fly ash stabilised soils used for soil improvement in road embankment construction projects in Northern Thailand. The results suggested that chemical compounds (CaO and MgO) on fly ash surfaces can control the pH of the fly ash and soil leachant. The dissolution of chromium and zinc was found to be amphoteric and controlled by oxide minerals at a high or low pH. Arsenic leaching was found to be oxyanionic where AsO_4~(3-) prevented the adsorption of arsenic onto the negatively charged fly ash surface. Different types of leachant also leached out in different amounts of heavy metals.
机译：粉煤灰是一种工业废料，在全球范围内被重新用作土壤稳定剂。在泰国，许多地面改良项目利用水泥和粉煤灰的混合物来稳定弱土。在这项研究中，实验室研究了从水泥和粉煤灰稳定化土壤中砷，铬，铅和锌的浸出机理。在泰国北部公路路堤建设项目中，对用于水泥改良的水泥和粉煤灰稳定土进行了不同浸出剂和pH条件的浸出试验。结果表明，粉煤灰表面的化合物（CaO和MgO）可以控制粉煤灰和土壤浸出剂的pH值。发现铬和锌的溶解是两性的，并且在高或低pH值下都受氧化物矿物的控制。发现砷的浸出是氧阴离子，其中AsO_4〜（3-）阻止了砷吸附到带负电的粉煤灰表面。不同类型的浸出剂还浸出了不同数量的重金属。

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  • 来源
    《Waste management & research》 |2018年第7期|616-623|共8页
  • 作者

    Kittitat Leelarungroj; Suched Likitlersuang; Thanakorn Chompoorat; Dao Janjaroen;

  • 作者单位

    Center of Excellence on Hazardous Substance Management, Chulalongkorn University, Bangkok, Thailand;

    Geotechnical Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand;

    Department of Civil Engineering, School of Engineering, University of Phayao, Phayao, Thailand;

    Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand ,Research Program : Toxic Substance Management in the Mining Industry, Center of Excellence on Hazardous Substance Management (HSM), Bangkok, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Leaching; fly ash; cement; metals; ground improvement;

    机译：浸出粉煤灰水泥;金属;地面改善;

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