›› 2017, Vol. 38 ›› Issue (S2): 82-88.doi: 10.16285/j.rsm.2017.S2.011

• 基础理论与实验研究 • 上一篇    下一篇

粒径和pH值对铬污染土稳定性能的影响规律及机制分析

张亭亭1,2,何星星1,2,王 平1,2,薛 强1,3 ,李江山1,3   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071; 2. 中国科学院大学,北京 100049;3. 污染泥土科学与工程湖北省重点实验室,湖北 武汉 430071
  • 收稿日期:2017-05-18 出版日期:2017-11-23 发布日期:2018-06-05
  • 作者简介:张亭亭,男,1990年生,博士研究生,主要从事污染土多相体作用效应与修复技术方面的研究工作。
  • 基金资助:

    国家自然科学基金(No. 41602315, No. 51479194);湖北省自然科学基金(No. 2016CFA082);湖北省科技支撑计划项目(No. 2015BCA252)。

Influence of particle size and pH on stability of chromium contaminated soil and its mechanism analysis

ZHANG Ting-ting1,2, HE Xing-xing1,2, WANG Ping1,2, XUE Qiang1,3, LI Jiang-shan1,3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Hubei Key Laboratory of Contaminated Clay Science & Engineering, Wuhan, Hubei 430071, China
  • Received:2017-05-18 Online:2017-11-23 Published:2018-06-05
  • Supported by:

    This work was supported by the National Science Foundation of China(41602315, 51479194), Hubei National Natural Science Foundation(2016CFA082), and Hubei Science and Technology Support Program(2015BCA252).

摘要: 采用硫酸亚铁(FeSO4)对铬污染土进行稳定化处理。基于浸出试验、碱性消解和改进BCR形态提取试验,研究了pH和粒径对铬污染土稳定性能的影响规律。试验结果表明,粒径和pH对铬污染土稳定性能有较大影响,随着粒径的降低,Cr(Ⅵ)、总Cr的浸出浓度和Cr(Ⅵ)含量均降低,粒径的降低可促使铬从弱酸态(F1态, 活性态)向可还原态(F2态, 较稳定态)转化。Cr(Ⅵ)浸出浓度和Cr(Ⅵ)含量均随着pH降低而降低,而总Cr的浸出浓度呈相反的变化规律。pH对铬形态分布存在临界值,当pH高于临界值时,随着pH的降低,稳定土中F1、F3态铬含量显著降低,F2态铬含量明显增加;当pH低于临界值时,pH的降低稳定土中F1态铬含量明显增加,F2、F3态铬含量显著降低。铬赋存形态的变化是铬污染稳定性能变化的本质原因。

关键词: 铬污染土, 稳定化, 浸出特性, 形态演化

Abstract: Ferrous sulfate(FeSO4) is used to stabilize chromium-contaminated soils. Leaching test, alkaline digestion test and sequential extractions test are conducted to investigate the variation of stabilize properties of FeSO4 treated chromium-contaminated soils along with particle size and pH. The results show that the leaching concentration(hexavalent chromium and total chromium), hexavalent chromium content of the soil are decreased significantly with particle size decreased. Sequential extractions test show that: with the decreased of particle size, the weak acid soluble fraction(F1) of chromium content decreased, while the reducible(F2) and oxidisable(F3) changed oppositely. The hexavalent chromium leaching concentration and hexavalent chromium content were decreased significantly with pH decreased; while the total chromium leaching concentration changed oppositely. There is a threshold value for pH in terms of its influence on chromium speciation. The weak acid soluble and oxidisable fraction of chromium content decreased with the pH decreased before its reached the threshold value; while the reducible changed oppositely. The weak acid soluble of chromium content increased with the pH decreased after its reached the threshold value; while the reducible and oxidisable fraction changed oppositely. The changing in stabilized properties and risk assessment of stabilized soil can be attributed to the change of chromium speciation.

Key words: chromium contaminated soil, stabilization, leaching properties, speciation evolution

中图分类号: 

  • TU 443

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