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The field-scale stabilization remediation and assessment of potential toxic elements based on the multi-source information from a Chinese Pb/Zn smelter contaminated site

某铅锌冶炼污染场地基于多源信息的重金属稳定化修复及其评价

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Abstract

Potential toxic elements (PTEs) generally co-existing in soils make a great challenge to the sustainable development and utilization of smelter contaminated sites. This study delved into the pollution characteristics of PTEs and conducted the field-scale remediation of PTEs stabilization. The results indicated that Cd, Pb, Zn, and As were identified as the main PTEs pollutants in soils with exceedance rates of 75.80% for Cd, 76.43% for Pb and 88.54% for As, respectively. The distribution patterns of PTEs were closely associated with soil physicochemical properties, pollutant transport routes, hydrogeological conditions, formation lithology, smelting process and smelting workshop distribution. Soil PTEs mainly originated from smelting activities, such as the emissions of smelting wastewater, flue gas and slags. In addition, a combination of mixture agents and chelating agent (TJ400) showed excellent performance for the synchronous stabilization of Cd, Pb and As within 7 d, and the mixing degree between stabilization agents and contaminated soils was over 90%. The present results would offer practical guidance in developing a suitable remediation scheme based on a comprehensive investigation of the pollution characteristics of PTEs in soils.

摘要

冶炼污染场地土壤中多重金属复合污染的特征增大了对土壤的修复和最终利用的难度。本研究深入调查了某铅锌冶炼场地土壤重金属污染特征, 针对性地制定多种联合稳定化修复方案, 采用高精度混合装备添加药剂, 实施稳定化修复工程。结果表明, Cd、Pb、Zn 和As 是场地土壤中最主要的重金属污染物, 其中Cd、Pb、As 的超标率分别为75.80%、76.43%、88.54%。重金属的分布模式与土壤理化性质、污染物迁移路径、水文地质条件、地层岩性、冶炼工艺、厂区功能布局等密切相关。土壤重金属污染主要来源于冶炼粉尘、废渣和废水排放等冶炼活动。稳定化工程效果显示, 在药剂与土壤混匀程度不低于90%时, 采用无机混合药剂与TJ400 螯合剂的组合方案, 对土壤稳定化处理7 d 后, 土壤中Cd、Pb 和As 同步稳定化效果最好。本研究结果可对多金属重污染场地土壤的稳定化修复提供实践指导。

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China

    Xiao-pin Guo  (郭小品), Jia-bin Yao  (姚佳斌), Ze-lin Xu  (徐则林) & Rong-bing Fu  (付融冰)

  2. CCCC Third Harbor Engineering Co., Ltd., Shanghai, 200030, China

    Ye-xun Li  (李业勋)

  3. No.8 Engineering Co., Ltd. of CCCC Third Harbor Engineering Co., Ltd., Zhuzhou, 412000, China

    Xiao-yong Zuo  (左小永), Ye-qin Xu  (徐业勤), Jin-hui Miao  (苗进辉) & Heng-yong Zhang  (张恒勇)

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  1. Xiao-pin Guo  (郭小品)
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Contributions

GUO Xiao-pin and XU Ze-lin conducted experiments and data analysis, interpreted and wrote the draft manuscript under the guidance of FU Rong-bing, who was responsible for the experiment and the design of the stabilization engineering scheme, and edited the manuscript. LI Ye-xun, ZUO Xiao-yong, XU Ye-qin, MIAO Jin-hui and ZHANG Heng-yong carried out the soil pollution investigation at the site, and jointly carried out the site stabilization engineering with XU Ze-lin and YAO Jia-bin.

Corresponding authors

Correspondence to Ye-xun Li  (李业勋) or Rong-bing Fu  (付融冰).

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GUO Xiao-pin, LI Ye-xun, ZUO Xiao-yong, XU Ye-qin, MIAO Jin-hui, ZHANG Heng-yong, YAO Jia-bin, XU Ze-lin and FU Rong-bing declare that they have no conflict of interest.

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Foundation item: Projects(2023YFC3707704, 2019YFC1805205) supported by the National Key Research and Development Program, China

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Guo, Xp., Li, Yx., Zuo, Xy. et al. The field-scale stabilization remediation and assessment of potential toxic elements based on the multi-source information from a Chinese Pb/Zn smelter contaminated site. J. Cent. South Univ. (2024). https://doi.org/10.1007/s11771-024-5631-6

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