Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils

Soil contamination is a growing concern for sustainable development worldwide. Conventional remediation approaches, such as using ordinary Portland cement (OPC) or lime are limited due to high CO2 emissions, energy consumption, and natural resource consumption. This paper proposes a sustainable meth...

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Main Authors: Xu, Bo, Sun, Xinlei, George, Vivian, Yi, Yaolin
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/177909
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1779092024-06-07T15:33:40Z Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils Xu, Bo Sun, Xinlei George, Vivian Yi, Yaolin School of Civil and Environmental Engineering Engineering Heavy metal Immobilization Soil contamination is a growing concern for sustainable development worldwide. Conventional remediation approaches, such as using ordinary Portland cement (OPC) or lime are limited due to high CO2 emissions, energy consumption, and natural resource consumption. This paper proposes a sustainable method using CO2 and a waste from steel production (ladle slag, LS) for rapid remediation of Cr and Zn-contaminated soils. Contaminated soils spiked by Cr and Zn with various initial concentrations were treated with 10% LS and subjected to conventional and CO2 curing for different periods. The results demonstrated that LS with conventional curing could reduce leaching concentrations of Cr and Zn in contaminated soils. However, it necessitated 28 days to meet the criteria of inert waste and drinking water standards. In contrast, LS with CO2 curing required significantly less time (32 h for Cr and 8 h for Zn) to achieve lower leaching concentrations of Cr and Zn than those with 28-day conventional curing. After CO2 curing for 152 h for Cr- and 80–120 h for Zn-contaminated soils, leaching concentrations of Cr and Zn were 1.5–4 times and 6–72 times lower than those with 28-day conventional curing, respectively. Simultaneously, carbon capture was increased from 10.6% to 17.5% and 19.9%, respectively, with the initial Cr and Zn concentrations increased from 0 to 8000 mg/kg. The strength of Cr- and Zn-contaminated soils with CO2 curing also effectively enhanced up to around 3.3–3.6 times and 1.3–3.3 times higher than those with 28-day conventional curing, respectively. Published version 2024-06-03T02:52:54Z 2024-06-03T02:52:54Z 2024 Journal Article Xu, B., Sun, X., George, V. & Yi, Y. (2024). Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils. Journal of CO2 Utilization, 81, 102738-. https://dx.doi.org/10.1016/j.jcou.2024.102738 2212-9820 https://hdl.handle.net/10356/177909 10.1016/j.jcou.2024.102738 2-s2.0-85188467393 81 102738 en Journal of CO2 Utilization © 2024 The Author(s). 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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Heavy metal
Immobilization
spellingShingle Engineering
Heavy metal
Immobilization
Xu, Bo
Sun, Xinlei
George, Vivian
Yi, Yaolin
Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils
description Soil contamination is a growing concern for sustainable development worldwide. Conventional remediation approaches, such as using ordinary Portland cement (OPC) or lime are limited due to high CO2 emissions, energy consumption, and natural resource consumption. This paper proposes a sustainable method using CO2 and a waste from steel production (ladle slag, LS) for rapid remediation of Cr and Zn-contaminated soils. Contaminated soils spiked by Cr and Zn with various initial concentrations were treated with 10% LS and subjected to conventional and CO2 curing for different periods. The results demonstrated that LS with conventional curing could reduce leaching concentrations of Cr and Zn in contaminated soils. However, it necessitated 28 days to meet the criteria of inert waste and drinking water standards. In contrast, LS with CO2 curing required significantly less time (32 h for Cr and 8 h for Zn) to achieve lower leaching concentrations of Cr and Zn than those with 28-day conventional curing. After CO2 curing for 152 h for Cr- and 80–120 h for Zn-contaminated soils, leaching concentrations of Cr and Zn were 1.5–4 times and 6–72 times lower than those with 28-day conventional curing, respectively. Simultaneously, carbon capture was increased from 10.6% to 17.5% and 19.9%, respectively, with the initial Cr and Zn concentrations increased from 0 to 8000 mg/kg. The strength of Cr- and Zn-contaminated soils with CO2 curing also effectively enhanced up to around 3.3–3.6 times and 1.3–3.3 times higher than those with 28-day conventional curing, respectively.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Xu, Bo
Sun, Xinlei
George, Vivian
Yi, Yaolin
format Article
author Xu, Bo
Sun, Xinlei
George, Vivian
Yi, Yaolin
author_sort Xu, Bo
title Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils
title_short Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils
title_full Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils
title_fullStr Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils
title_full_unstemmed Sustainable and integrated approaches for carbon capture and rapid remediation of Cr- and Zn-contaminated soils
title_sort sustainable and integrated approaches for carbon capture and rapid remediation of cr- and zn-contaminated soils
publishDate 2024
url https://hdl.handle.net/10356/177909
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