Analytical evaluation of heavy metal desorption process from contaminated soil under chelator leaching

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-04-12 DOI:10.1016/j.sandf.2025.101619

Yan Wang , Peng Zhu , Jian Zheng , Guan-Nian Chen , Xin-Xin Li , Wan-Lu Zhang

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引用次数: 0

Abstract

Analytical solutions elucidating the desorption process of soil flushing aided with chelating agent were established based on advection-domination assumption. The proposed analytical models are feasible for the simulation of eluent leaching tests, which is validated by the numerical analyses as well as column leaching tests of heavy metal contaminated silty soil using ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) chelating agents. Based on the fittings using the proposed model, the desorption mode of heavy metals aided by EDTA-2Na in the column flushing tests more accords with the pseudo-first-order model comparing to the pseudo-second-order model. The desorption rates calibrated from the column tests are 3∼10 times slower than those from batch tests while the equilibrium desorption ratios are consistent. Limited reaction space and insufficient contacting of chelating agents are supposed to be the major cause of this phenomenon. The proposed analytical model aids deeper understanding for the soil flushing assisted with chelating agents, and can help to provide theoretical basis for soil flushing remediations.

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螯合剂浸出污染土壤重金属解吸过程的分析评价

基于平流占优假设，建立了螯合剂辅助土壤冲洗解吸过程的解析解。通过数值分析和乙二胺四乙酸二钠（EDTA-2Na）螯合剂对重金属污染粉质土壤的柱浸试验，验证了所提分析模型在淋洗液浸出试验模拟中的可行性。基于该模型的管件，在柱冲试验中，EDTA-2Na对重金属的解吸模式比拟二阶模型更符合拟一阶模型。在平衡解吸比一致的情况下，从柱式试验校准的解吸速率比从批式试验校准的解吸速率慢3 ~ 10倍。反应空间有限和螯合剂接触不足是造成这一现象的主要原因。该分析模型有助于加深对螯合剂辅助土壤冲洗的认识，为土壤冲洗修复提供理论依据。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.