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首页> 外文期刊>Journal of Cleaner Production >Green remediation of high-lead contaminated soil by stabilization/ solidification with insoluble humin: Long-term leaching and mechanical characteristics
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Green remediation of high-lead contaminated soil by stabilization/ solidification with insoluble humin: Long-term leaching and mechanical characteristics

机译：通过稳定/凝固与不溶性休素稳定的绿色整理：长期浸出和机械特性

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摘要

High concentrations of lead in soil will greatly weaken the stabilization/solidification effect. Humin (HM) is expected to improve this process because it is a neutral, insoluble, porous and green material as well as an eco-friendly adsorbent extracted from natural peat soil. However, HM has not been studied with respect to the stabilization/solidification (S/S) characteristics of potentially toxic element (PTE)-contaminated soil due to its different extraction sources and methods, as well as complex properties. To study these effects, insoluble HM was extracted for treatment of high-lead contaminated soil by cement-based S/S. The experimental results show that HM has a strong adsorption capacity for lead with a maximum adsorption capacity of 200.2 mg kg(-1). The negative influence of a high content of lead on the compressive strength over a 0-90-day period is weakened after adding HM to the soil, wherein a competitive mechanism between HM and a high concentration of lead is proposed. The lead leaching concentration of stabilized soil is significantly decreased under different leaching methods from 0 to 60 days and then decreases slowly. The lead speciation results for the stabilized soil determined through the Tessier sequential extraction method show that HM promotes the gradual chemical transformation of lead from exchangeable and carbonate-bound fractions to a more stable state, with respective decreases of 27.5% and 15.1%. In addition, SEM-EDS images show that HM with a high porosity and specific surface area coexists well with cement, which promotes the stabilization of lead. In conclusion, HM contributes to decreasing the mobility and bioavailability of lead and achieving environmental remediation.
机译：土壤中的高浓度铅将大大削弱稳定/凝固效果。预计湿润（HM）将改善这一过程，因为它是一种中性，不溶性，多孔和绿色材料，以及从天然泥炭土中提取的环保吸附剂。然而，由于其不同的提取来源和方法以及复杂性能，尚未研究潜在有毒元素（PTE）含有毒性元素（PTE）的稳定性/凝固（S / S）特性的HM。为了研究这些效果，提取不溶性的HM以通过基于水泥的S / S治疗高铅污染土壤。实验结果表明，HM具有强大的吸附能力，具有200.2mg kg（-1）的最大吸附能力。在向土壤中加入HM后，在0-90天期间，在0-90天期间对抗压强度的高含量对压缩强度的负面影响减弱，其中提出了HM和高浓度的铅之间的竞争机制。在不同浸出方法下，稳定的土壤的铅浸出浓度从0〜60天的不同浸出方法显着降低，然后缓慢降低。通过Tessier顺序提取方法确定的稳定土壤的铅形状结果表明，HM促进了从可更换和碳酸盐结合的级分至更稳定的状态的铅的逐渐化学转化，其相应的降低27.5％和15.1％。此外，SEM-EDS图像显示HM，具有高孔隙率和比表面积与水泥共存得很好，这促进了铅的稳定性。总之，HM有助于降低铅和达到环境修复的流动性和生物利用度。

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  • 来源
    《Journal of Cleaner Production》 |2021年第15期|129184.1-129184.12|共12页
  • 作者

    Ge Shangqi; Jiang Wenhao; Zheng Lingwei; Xie Xinyu; Pan Yize;

  • 作者单位

    Zhejiang Univ Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China;

    Chinese Acad Sci State Key Lab Geomech & Geotech Engn Inst Rock & Soil Mech Wuhan 430071 Peoples R China;

    Ningbo Res Inst Zhejiang Univ Ningbo 315100 Peoples R China|NingboTech Univ Ningbo 315100 Peoples R China;

    Zhejiang Univ Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China|Wenzhou Res Inst Zhejiang Univ Wenzhou 325000 Peoples R China;

    Zhejiang Univ Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China|Northwestern Univ Dept Civil & Environm Engn Mech & Energy Lab Evanston IL 60208 USA;

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  • 正文语种 eng
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  • 关键词

    Green material; Cement-based S/S; Compressive strength; Leaching; Lead speciation;

    机译：绿色材料;基于水泥的S / S;抗压强度;浸出;铅形态;

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