Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation
Cadmium (Cd)-contaminated soils may pose a significant threat on human health. They are often treated with quick lime (CaO) and reactive magnesia (MgO), but these treatments often result in low strength. Hence, in this study, partial and full carbonation are used to enhance the stabilization/solidif...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2025
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| Online Access: | https://hdl.handle.net/10356/182451 |
| _version_ | 1826109719828234240 |
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| author | Li, Wentao Qin, Junde Yi, Yaolin |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Li, Wentao Qin, Junde Yi, Yaolin |
| author_sort | Li, Wentao |
| collection | NTU |
| description | Cadmium (Cd)-contaminated soils may pose a significant threat on human health. They are often treated with quick lime (CaO) and reactive magnesia (MgO), but these treatments often result in low strength. Hence, in this study, partial and full carbonation are used to enhance the stabilization/solidification of CaO- and MgO-treated Cd-contaminated soils, aiming to achieve CO2 sequestration, strength improvement, and Cd immobilization. Performance of treated contaminated soils is evaluated through unconfined compressive strength (UCS), leaching, X-ray diffraction (XRD), and thermogravimetric analysis (TGA) tests. The results indicate that carbonation significantly enhances the UCS of both CaO- and MgO-treated Cd-contaminated soils. After carbonation, MgO-treated soils exhibit higher UCS than CaO-treated soils. Partial and full carbonation yield similar UCS in CaO-treated soils, while full carbonation results in higher UCS in MgO-treated soils. For CaO-treated soils, partial carbonation keeps Cd leachability below the 1 mg/kg limit, but full carbonation increases it beyond this limit. In contrast, fully carbonated MgO-treated soils maintain Cd leachability below the limit, though partial carbonation leads to higher leachability. Formation of Ca and Mg carbonates contributes to the strength improvement of soils. Cd(OH)2 and its complex, as well as CdCO3 exist in partially and fully carbonated soils, lowering leached Cd concentration. Overall, partial carbonation is better for CaO-treated soils, while full carbonation is preferable for MgO-treated soils. |
| first_indexed | 2025-03-09T09:52:18Z |
| format | Journal Article |
| id | ntu-10356/182451 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-03-09T09:52:18Z |
| publishDate | 2025 |
| record_format | dspace |
| spelling | ntu-10356/1824512025-02-07T15:34:17Z Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation Li, Wentao Qin, Junde Yi, Yaolin School of Civil and Environmental Engineering Engineering Contaminated soil Cadmium Cadmium (Cd)-contaminated soils may pose a significant threat on human health. They are often treated with quick lime (CaO) and reactive magnesia (MgO), but these treatments often result in low strength. Hence, in this study, partial and full carbonation are used to enhance the stabilization/solidification of CaO- and MgO-treated Cd-contaminated soils, aiming to achieve CO2 sequestration, strength improvement, and Cd immobilization. Performance of treated contaminated soils is evaluated through unconfined compressive strength (UCS), leaching, X-ray diffraction (XRD), and thermogravimetric analysis (TGA) tests. The results indicate that carbonation significantly enhances the UCS of both CaO- and MgO-treated Cd-contaminated soils. After carbonation, MgO-treated soils exhibit higher UCS than CaO-treated soils. Partial and full carbonation yield similar UCS in CaO-treated soils, while full carbonation results in higher UCS in MgO-treated soils. For CaO-treated soils, partial carbonation keeps Cd leachability below the 1 mg/kg limit, but full carbonation increases it beyond this limit. In contrast, fully carbonated MgO-treated soils maintain Cd leachability below the limit, though partial carbonation leads to higher leachability. Formation of Ca and Mg carbonates contributes to the strength improvement of soils. Cd(OH)2 and its complex, as well as CdCO3 exist in partially and fully carbonated soils, lowering leached Cd concentration. Overall, partial carbonation is better for CaO-treated soils, while full carbonation is preferable for MgO-treated soils. Published version The authors appreciate support from The Key Research and Development Program of Hubei Province, China (No. 2023BAB024), and Joint Funds of the Natural Science Foundation of Hubei Province, China (No. 2022CFD130), and China-Singapore International Joint Research Institute (No. N2052401–A204). 2025-02-03T05:55:28Z 2025-02-03T05:55:28Z 2024 Journal Article Li, W., Qin, J. & Yi, Y. (2024). Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation. Journal of CO2 Utilization, 88, 102953-. https://dx.doi.org/10.1016/j.jcou.2024.102953 2212-9820 https://hdl.handle.net/10356/182451 10.1016/j.jcou.2024.102953 2-s2.0-85205471787 88 102953 en N2052401–A204 Journal of CO2 Utilization © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). application/pdf |
| spellingShingle | Engineering Contaminated soil Cadmium Li, Wentao Qin, Junde Yi, Yaolin Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation |
| title | Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation |
| title_full | Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation |
| title_fullStr | Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation |
| title_full_unstemmed | Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation |
| title_short | Strength and leaching behavior of CaO- and MgO-treated Cd-contaminated soils subjected to partial and full carbonation |
| title_sort | strength and leaching behavior of cao and mgo treated cd contaminated soils subjected to partial and full carbonation |
| topic | Engineering Contaminated soil Cadmium |
| url | https://hdl.handle.net/10356/182451 |
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