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首页> 外文期刊>Chemosphere >Quicklime-induced changes of soil properties: Implications for enhanced remediation of volatile chlorinated hydrocarbon contaminated soils via mechanical soil aeration
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Quicklime-induced changes of soil properties: Implications for enhanced remediation of volatile chlorinated hydrocarbon contaminated soils via mechanical soil aeration

机译：生石灰引起的土壤性质变化：对通过机械土壤通气增强对挥发性氯代烃污染土壤的治理的意义

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摘要

Mechanical soil aeration is used for soil remediation at sites contaminated by volatile organic compounds. However, the effectiveness of the method is limited by low soil temperature, high soil moisture, and high soil viscosity. Combined with mechanical soil aeration, quicklime has a practical application value related to reinforcement remediation and to its action in the remediation of soil contaminated with volatile organic compounds. In this study, the target pollutant was trichloroethylene, which is a volatile chlorinated hydrocarbon pollutant commonly found in contaminated soils. A restoration experiment was carried out, using a set of mechanical soil-aeration simulation tests, by adding quicklime (mass ratios of 3,10, and 20%) to the contaminated soil. The results clearly indicate that quicklime changed the physical properties of the soil, which affected the environmental behaviour of trichloroethylene in the soil. The addition of CaO increased soil temperature and reduced soil moisture to improve the mass transfer of trichloroethylene. In addition, it improved the macroporous cumulative pore volume and average pore size, which increased soil permeability. As soil pH increased, the clay mineral content in the soils decreased, the cation exchange capacity and the redox potential decreased, and the removal of trichloroethylene from the soil was enhanced to a certain extent. After the addition of quicklime, the functional group COO of soil organic matter could interact with calcium ions, which increased soil polarity and promoted the removal of trichloroethylene.
机译：机械土壤通气用于在被挥发性有机化合物污染的地点进行土壤修复。但是，该方法的有效性受到土壤温度低，土壤湿度高和土壤粘度高的限制。结合机械土壤通气，生石灰具有与补强修复及其在修复被挥发性有机化合物污染的土壤中的作用有关的实际应用价值。在这项研究中，目标污染物是三氯乙烯，这是一种常见于受污染土壤中的挥发性氯代烃污染物。通过使用一组机械的土壤通气模拟测试，通过向受污染的土壤中添加生石灰（质量比为3,10和20％）来进行恢复实验。结果清楚地表明，生石灰改变了土壤的物理性质，从而影响了三氯乙烯在土壤中的环境行为。 CaO的添加提高了土壤温度，减少了土壤水分，从而改善了三氯乙烯的传质。另外，它改善了大孔的累积孔体积和平均孔径，从而增加了土壤的渗透性。随着土壤pH值的升高，土壤中粘土矿物的含量降低，阳离子交换能力和氧化还原电位下降，土壤中三氯乙烯的去除率得到一定程度的提高。加入生石灰后，土壤有机质的官能团COO可与钙离子相互作用，从而增加土壤极性并促进三氯乙烯的去除。

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  • 来源
    《Chemosphere》 |2017年第4期|435-443|共9页
  • 作者

    Ma Yan; Dong Binbin; He Xiaosong; Shi Yi; Xu Mingyue; He Xuwen; Du Xiaoming; Li Fasheng;

  • 作者单位

    China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China|Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Dept Soil Pollut Control, Beijing 100012, Peoples R China;

    China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China;

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

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

    China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China;

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

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

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

    Quicklime; Mechanical soil aeration; Soil; Volatile chlorinated hydrocarbons; Physical/chemical properties;

    机译：生石灰;机械土壤通气;土壤;挥发性氯代烃;理化特性;

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