用于固化/稳定土壤中铜（II）污染的环氧树脂：浸出、力学和微观结构特性。
Epoxy resin for solidification/stabilization of soil contaminated with copper (II): Leaching, mechanical, and microstructural characterization.
机构信息
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, 430068, China.
出版信息
Environ Res. 2024 Jan 1;240(Pt 1):117512. doi: 10.1016/j.envres.2023.117512. Epub 2023 Oct 31.
Among different types of heavy metal-contaminated soil, copper (Cu)-contaminated soil is very serious, and the Cu concentration in it is usually very high. It is common to solidify/stabilize Cu-contaminated soil using alkaline cementitious material. However, the remediated Cu-contaminated soil fails to meet the requirements of environmental safety and load-bearing capacity. This dilemma in the remediation of Cu-contaminated soil hinders the effective utilization of land resources. In this study, epoxy resin (EP) was utilized to solidify/stabilize Cu-contaminated soil due to its stable and rapid curing performance and excellent resistance to acid, alkali, and salt erosion. The mechanical properties, environmental effects, and curing mechanism of EP-cured Cu-contaminated soil were investigated. The results showed that the application of EP significantly enhanced the unconfined compressive strength (UCS), cohesion and internal friction angle of Cu-contaminated soil. All specimens met the UCS criterion specified by the United States Environmental Protection Agency (USPEA), namely no less than 0.35 MPa, which indicated that those EP-cured Cu-contaminated soil were qualified for practical engineering applications. According to the toxicity characteristic leaching procedure (TCLP), the application of EP enhanced the stability of Cu in Cu-contaminated soil. The leaching index of Cu ranged from 11 to 14. A high leaching index showed that the S/S treatment was safe and effective and the remediated Cu-contaminated soil satisfied the environmental requirement for heavy metals. This study confirmed the feasibility of utilizing EP in the solidification/stabilization (S/S) technology to convert high-concentration Cu-contaminated soil into secure and stable engineering materials. The remediation of Cu-contaminated soil by EP lays a solid foundation for the safe treatment and reuse of heavy metal-contaminated land resources.
在不同类型的重金属污染土壤中，铜（Cu）污染土壤问题十分严重，其土壤中铜浓度通常很高。常用碱性胶凝材料固化/稳定化 Cu 污染土壤。然而，修复后的 Cu 污染土壤无法满足环境安全和承载能力的要求。这一困境阻碍了 Cu 污染土壤修复技术的有效应用，从而限制了土地资源的有效利用。本研究利用环氧树脂（EP）固化/稳定化 Cu 污染土壤，这是因为 EP 具有稳定快速的固化性能，以及优异的耐酸、碱、盐侵蚀能力。研究了 EP 固化/稳定化 Cu 污染土的力学性能、环境效应和固化机理。结果表明，EP 的应用显著提高了 Cu 污染土的无侧限抗压强度（UCS）、凝聚力和内摩擦角。所有试样均满足美国环保署（USPEA）规定的 UCS 标准，即不小于 0.35 MPa，这表明 EP 固化的 Cu 污染土可用于实际工程应用。根据毒性特征浸出程序（TCLP），EP 的应用增强了 Cu 在 Cu 污染土中的稳定性。Cu 的浸出指数在 11-14 之间。高浸出指数表明 S/S 处理安全有效，修复后的 Cu 污染土满足重金属环境要求。本研究证实了 EP 在固化/稳定化（S/S）技术中用于将高浓度 Cu 污染土壤转化为安全稳定的工程材料的可行性。EP 修复 Cu 污染土为重金属污染土地资源的安全处理和再利用奠定了基础。
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