Effects of organic matter components and incubation on the cement-based stabilization/solidification characteristics of lead-contaminated soil

Ge, Shangqi; Pan, Yize; Zheng, Lingwei; Xie, Xuansong

doi:10.1016/j.chemosphere.2020.127646

Cited by 11 publications

(6 citation statements)

References 49 publications

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“…By comparing the experimental results of three different extractants, it is obvious that when the extractant is glacial acetic acid, the concentration of Pb 2+ in the leaching solution of cement-cured soil is the lowest, when the extractant is deionized water the concentration of Pb 2+ in the leaching solution is the highest, and the mixture of nitric acid and sulfuric acid is in the middle. The concentration of Pb 2+ in the mixed solution of nitric acid and sulfuric acid is slightly higher than that of deionized water, which is consistent with the research results in reference (Sinegani et al, 2018;Ge et al, 2020;Zha et al, 2020b).…”

Section: Toxic Leaching Characteristicssupporting

confidence: 91%

“…The reaction process is expressed as follows: (2) In the second stage, the S/S reaction process produces silica-aluminate polymers (N-A-S-H, also known as CAH). The NaOH generated by the above reaction and the alkaline OH-of the soda residue itself act on the surface of the lime and are excited to form silicaaluminate polymers of different polymerization degrees (N-A-S-H) by a process of dissolution and polymerization (Sobiecka et al, 2014;Ge et al, 2020). The reaction rate of this process is closely related to the basicity of the system.…”

Section: Solidi Cation Mechanismmentioning

confidence: 99%

“…Ge et al, 2020). The FTIR spectra of the composite CSR after in ltration of Pb 2+ are exhibited in Fig.3(b).…”

mentioning

confidence: 99%

“…In this work, the pH=7.30 of the test soil was determined to be uncontaminated and the concentrations of other pollutants were lower than the minimum risk values speci ed in the Risk Control Standard for Soil Contamination of Agricultural Land of China (GB/T 15618, 2018) and the Risk Control Standard for Soil Contamination of Construction Land of China (GB/T 36600, 2018). It means that the test soil is safe and usable(Ge et al, 2020). , was purchased from Tianjin Cement Co.…”

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confidence: 99%

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Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Zuo

Wang

et al. 2022

Environ Earth Sci

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The cement solidi cation/stabilization method of heavy metal contaminated soils has been promoted in engineering practice and applied on a large scale for site remediation, but it still reveals some scienti c problems in the current complex and variable global extreme climate. To solve these problems and explore cement-based soil remediation technology, this study used the waste soda residue produced in large quantities in the "ammonia-soda process" as a composite additive, and established an innovative composite model of cement and soda residue by adding different ratios, which was applied to the remediation experiments of lead-contaminated soil. The innovative composite model solidi cation/stabilization of cement and soda residue for uncon ned compressive strength and toxic leaching properties under different soil environmental conditions were investigated. Moreover, curing and leaching mechanisms are discussed, and future industrial practice was evaluated. The results showed that the addition of soda residue improved the early (20 days) uncon ned compressive strength (UCS) of the composite curing agent for lead-contaminated soil by an average of 23.1% Mpa.When the percentage of soda residue composite was 40%, the UCS strength was 0.96 Mpa, which reached the maximum. The concentration of Pb 2+ in the leachate of the cement-soda residue composite curing agent was greatly reduced (average 3.28 times) compared with that of a single cement in the same situation, with an average leached Pb 2+ concentration of 1.87 mg•L -1 . This indicates that the addition of alkali residue improved the curing effect. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction between the cement-soda residue composite and soil particles. The leaching mechanism of cement-soda residue to aqueous solution is mainly the consumption of acid ions by alkaline substances. This study will provide scienti c data to support potential lead-containing soil in site remediation technologies and future large-scale engineering applications. Highlights 1. The cement and soda residue were compounded in a direct homogeneous mixture.2. The UCS, TCL, curing and leaching mechanisms were researched and discussed.3. The doping ratios of S b /S d =20% and S s /S b =40% have the best curing effect. 4. cement-soda residue composite reduces the leaching of Pb 2+ by 3.28 times, i.e. 1.87 mg•L -1 . 5. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction.

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Section: Toxic Leaching Characteristicssupporting

confidence: 91%

Section: Solidi Cation Mechanismmentioning

confidence: 99%

“…Ge et al, 2020). The FTIR spectra of the composite CSR after in ltration of Pb 2+ are exhibited in Fig.3(b).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Zuo

Wang

et al. 2022

Environ Earth Sci

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show abstract

Section: Toxic Leaching Characteristicssupporting

confidence: 91%

Investigation On Stabilization/Solidification Characteristics of Lead Contaminated Soil Using Innovative Composite Model of Cement And Soda Residue

Zuo

Wang

et al. 2021

Preprint

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The cement solidification/stabilization method of heavy metal contaminated soils has been promoted in engineering practice and applied on a large scale for site remediation, but it still reveals some scientific problems in the current complex and variable global extreme climate. To solve these problems and explore cement-based soil remediation technology, this study used the waste soda residue produced in large quantities in the "ammonia-soda process" as a composite additive, and established an innovative composite model of cement and soda residue by adding different ratios, which was applied to the remediation experiments of lead-contaminated soil. The innovative composite model solidification/stabilization of cement and soda residue for unconfined compressive strength and toxic leaching properties under different soil environmental conditions were investigated. Moreover, curing and leaching mechanisms are discussed, and future industrial practice was evaluated. The results showed that the addition of soda residue improved the early (20 days) unconfined compressive strength (UCS) of the composite curing agent for lead-contaminated soil by an average of 23.1% Mpa. When the percentage of soda residue composite was 40%, the UCS strength was 0.96 Mpa, which reached the maximum. The concentration of Pb2+ in the leachate of the cement-soda residue composite curing agent was greatly reduced (average 3.28 times) compared with that of a single cement in the same situation, with an average leached Pb2+ concentration of 1.87 mg·L-1. This indicates that the addition of alkali residue improved the curing effect. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction between the cement-soda residue composite and soil particles. The leaching mechanism of cement-soda residue to aqueous solution is mainly the consumption of acid ions by alkaline substances. This study will provide scientific data to support potential lead-containing soil in site remediation technologies and future large-scale engineering applications.

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Laboratory assessment of impact of nano-SiO2 on different soil types in onshore and offshore environment

Chen,

Xie,

Tao

et al. 2024

Acta Geotech.

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Effects of organic matter components and incubation on the cement-based stabilization/solidification characteristics of lead-contaminated soil

Cited by 11 publications

References 49 publications

Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Investigation on stabilization/solidification characteristics of lead-contaminated soil using innovative composite model of cement and soda residue

Investigation On Stabilization/Solidification Characteristics of Lead Contaminated Soil Using Innovative Composite Model of Cement And Soda Residue

Laboratory assessment of impact of nano-SiO2 on different soil types in onshore and offshore environment

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