Study of factors affecting the remediation of contaminated soil through pneumatic fracturing and soil vapor extraction

Liu, Yanchao; Huang, Feng; Zhou, Dan; Wang, Taizhe; Wang, Guihe

doi:10.1016/j.jhazmat.2024.133776

Journal of Hazardous Materials

2024

DOI: 10.1016/j.jhazmat.2024.133776

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Study of factors affecting the remediation of contaminated soil through pneumatic fracturing and soil vapor extraction

Yanchao Liu,

Feng Huang,

Dan Zhou

et al.

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Cited by 2 publications

References 33 publications

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The Mechanism for Remediation of Low-Permeable Soil Contaminated with Petroleum Hydrocarbons by Thermally-Enhanced Soil Vapor Extraction Combined with Sand Mixing

Yu,

Kang,

Song

et al. 2024

Int J Environ Res

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Thermally-enhanced soil vapor extraction (T-SVE) combined with sand mixing is an alternative technology for remediating low-permeable soil polluted by organic contaminants. In this study, a T-SVE apparatus with a large heating cylinder was constructed for exploring removal mechanisms of typical petroleum hydrocarbons of n-C 11 and C 13 − 16 alkanes, and dynamics of heat propagation within soils during T-SVE operation was simulated by CMG-STARS software. After 6 days of T-SVE, most of the soil concentration-gradient curves of n-alkanes almost coincided with their isothermal contours, suggested the crucial role of thermal conductivity on T-SVE remediation e ciency. The mass transfer of n-alkanes from thermally-treated soil to extraction well represented an irregular pulsed mode. Released gas-phase of n-alkanes sometimes increased rapidly by 1-2 orders of magnitudes and then quickly decreased. Trivial impact of soil organic matter on heat transfer was observed. n-alkanes were more easily eliminated from soil with lower organic matter due to the less retention of them. By contrast, the higher soil moisture retarded heat transfer in the initial 2 days attributed to the heat consumption induced by water evaporation and n-alkane volatilization. In the next 4 days, soil pores occupied by water were gradually displaced by air, leading to accelerated heat transfer and evaporation of n-alkane and therefore promoted eventual remediation e ciency of T-SVE. Suitable original soil moisture is important for T-SVE remediating low-permeable soil combined with sand mixing.

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The Mechanism for Remediation of Low-Permeable Soil Contaminated with Petroleum Hydrocarbons by Thermally-Enhanced Soil Vapor Extraction Combined with Sand Mixing

Yu,

Kang,

Song

et al. 2024

Int J Environ Res

View full text Add to dashboard Cite

show abstract

Remediation effectiveness and mechanism on surfactant-enhanced remediation of low-permeability petroleum hydrocarbon contaminated soil under fracturing conditions

Feng,

Niu,

Shi

et al. 2025

Journal of Hydrology

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Study of factors affecting the remediation of contaminated soil through pneumatic fracturing and soil vapor extraction

Cited by 2 publications

References 33 publications

The Mechanism for Remediation of Low-Permeable Soil Contaminated with Petroleum Hydrocarbons by Thermally-Enhanced Soil Vapor Extraction Combined with Sand Mixing

The Mechanism for Remediation of Low-Permeable Soil Contaminated with Petroleum Hydrocarbons by Thermally-Enhanced Soil Vapor Extraction Combined with Sand Mixing

Remediation effectiveness and mechanism on surfactant-enhanced remediation of low-permeability petroleum hydrocarbon contaminated soil under fracturing conditions

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