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首页> 外文期刊>Construction and Building Materials >Field evaluation of a new hydroxyapatite based binder for ex-situ solidification/stabilization of a heavy metal contaminated site soil around a Pb-Zn smelter
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Field evaluation of a new hydroxyapatite based binder for ex-situ solidification/stabilization of a heavy metal contaminated site soil around a Pb-Zn smelter

机译：一种新的基于羟基磷灰石的粘结剂的现场评估，用于异质固化/稳定Pb-Zn冶炼厂周围的重金属污染场地土壤

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摘要

This study presents a field trial of ex-situ solidification/stabilization of heavy metal contaminated soils using a new hydroxyapatite based binder SPC (superphosphate and calcium oxide). The field performance including electrical conductivity (EC), heavy metal and chemical oxygen demand (COD) leachability, and penetration resistance of stabilized soils up to 256 days after treatment is investigated. Moreover, acid neutralization capacity (ANC), metal speciation, and soil mineralogy analyses are performed to elucidate the heavy metal immobilization mechanisms. The results indicate that the stabilized soils have lower EC values than untreated soils, indicating the lower soluble salt contents in stabilized soils. Ex-situ treatment can significantly reduce acid soluble fraction contents and leachability of lead, zinc and cadmium in soils as a consequence. Decrease in COD leachability is observed during the curing period up to 256 days. Additionally, SPC stabilized soils give superior mechanical properties as indicated by their higher penetration resistance values as compared to the untreated soils. The improvement in ANC and reduction in acid soluble fraction resulting from the formation of phosphate-based precipitates are mainly responsible for the reduced heavy metal leachability of stabilized soils. Additionally, ex-situ SPC treatment is found to be effective in improving soil spatial homogeneity. (C) 2019 Elsevier Ltd. All rights reserved.
机译：这项研究提出了使用新型基于羟基磷灰石的粘结剂SPC（过磷酸钙和氧化钙）对重金属污染土壤进行异地固化/稳定化的现场试验。研究了包括处理后长达256天的稳定土壤的电导率（EC），重金属和化学需氧量（COD）的浸出性以及抗穿透性的田间性能。此外，进行了酸中和能力（ANC），金属形态分析和土壤矿物学分析，以阐明重金属固定化机理。结果表明，稳定化土壤的EC值低于未处理土壤，表明稳定化土壤中的可溶性盐含量较低。因此，异地处理可显着降低土壤中的酸溶物含量以及铅，锌和镉的浸出能力。在长达256天的固化期间，观察到了COD浸出能力的降低。此外，与未经处理的土壤相比，经SPC稳定的土壤具有更高的机械性能，这是由于其较高的抗渗透性值所表明。由磷酸盐基沉淀物的形成引起的ANC的改善和酸溶分数的减少，主要是由于稳定土壤中重金属的浸出能力降低。另外，发现异位SPC处理可有效改善土壤空间均匀性。 （C）2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Construction and Building Materials》 |2019年第20期|278-288|共11页
  • 作者

    Xia Wei-Yi; Du Yan-Jun; Li Fa-Sheng; Guo Guan-Lin; Yan Xiu-Lan; Li Chun-Ping; Arulrajah Arul; Wang Fei; Wang Shui;

  • 作者单位

    Jiangsu Prov Acad Environm Sci, Jiangsu Prov Key Lab Environm Engn, Nanjing 210036, Jiangsu, Peoples R China|Southeast Univ, Inst Geotech Engn, Jiangsu Key Lab Urban Underground Engn & Environm, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Inst Geotech Engn, Jiangsu Key Lab Urban Underground Engn & Environm, Nanjing 210096, Jiangsu, Peoples R China;

    Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China;

    Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China;

    Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China;

    Beijing Bldg Mat Acad Sci Res, State Key Lab Solid Waste Resources Utilizat & En, Beijing 100041, Peoples R China;

    Swinburne Univ Technol, Dept Civil & Construct Engn, Hawthorn, Vic 3122, Australia;

    Southeast Univ, Inst Geotech Engn, Jiangsu Key Lab Urban Underground Engn & Environm, Nanjing 210096, Jiangsu, Peoples R China;

    Jiangsu Prov Acad Environm Sci, Jiangsu Prov Key Lab Environm Engn, Nanjing 210036, Jiangsu, Peoples R China;

  • 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

    Contaminated soil; Ex-situ solidification and stabilization; Leachability; Penetration resistance; X-ray diffraction;

    机译：污染土壤;异位固化和稳定;浸出性;抗渗透性;X射线衍射;

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