On quantifying global carbon emission from oil contaminated lands over centuries

Sookhak Lari, Kaveh; Davis, Greg B.; Bastow, Trevor; Rayner, John L.

doi:10.1016/j.scitotenv.2023.168039

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…Such facilities are where PFAS liquids have been used in fire-fighting foams, for training, and with LNAPL releases. The global scale and spread of such incidents (and hence usage of a PFAS-contaminating subsurface) are significant . Despite its occurrence, the dynamics of PFAS is an unknown function of the multiphase multicomponent dynamics of LNAPLs in the subsurface, which by itself has been shown to be challenging to characterize.…”

Section: Discussionmentioning

confidence: 99%

“…The global scale and spread of such incidents (and hence usage of a PFAS-contaminating subsurface) are significant. 88 Despite its occurrence, the dynamics of PFAS is an unknown function of the multiphase multicomponent dynamics of LNAPLs in the subsurface, which by itself has been shown to be challenging to characterize. Migration, disturbance, and changes of LNAPL plumes due to active remediation and natural source zone depletion increase the complexities even more.…”

Section: Discussionmentioning

confidence: 99%

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The Dynamics of Per- and Polyfluoroalkyl Substances (PFAS) at Interfaces in Porous Media: A Computational Roadmap from Nanoscale Molecular Dynamics Simulation to Macroscale Modeling

Sookhak Lari,

Davis,

Kumar

et al. 2024

ACS Omega

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Managing and remediating perfluoroalkyl and polyfluoroalkyl substance (PFAS) contaminated sites remains challenging. The major reasons are the complexity of geological media, partly unknown dynamics of the PFAS in different phases and at fluid− fluid and fluid−solid interfaces, and the presence of cocontaminants such as nonaqueous phase liquids (NAPLs). Critical knowledge gaps exist in understanding the behavior and fate of PFAS in vadose and saturated zones and in other porous media such as concrete and asphalt. The complexity of PFAS−surface interactions warrants the use of advanced characterization and computational tools to understand and quantify nanoscale behavior of the molecules. This can then be upscaled to the microscale to develop a constitutive relationship, in particular to distinguish between surface and bulk diffusion. The dominance of surface diffusion compared to bulk diffusion results in the solutocapillary Marangoni effect, which has not been considered while investigating the fate of PFAS. Without a deep understanding of these phenomena, derivation of constitutive relationships is challenging. The current Darcy scale mass-transfer models use constitutive relationships derived from either experiments or field measurements, which makes their applicability potentially limited. Here we review current efforts and propose a roadmap for developing Darcy scale transport equations for PFAS. We find that this needs to be based on systematic upscaling of both experimental and computational studies from nano-to microscales. We highlight recent efforts to undertake molecular dynamics simulations on problems with similar levels of complexity and explore the feasibility of conducting nanoscale simulations on PFAS dynamics at the interface of fluid pairs.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Dynamics of Per- and Polyfluoroalkyl Substances (PFAS) at Interfaces in Porous Media: A Computational Roadmap from Nanoscale Molecular Dynamics Simulation to Macroscale Modeling

Sookhak Lari,

Davis,

Kumar

et al. 2024

ACS Omega

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“…This condition complicates the cleaning and soil remediation processes and also poses a risk of groundwater contamination. The contamination will not only affect groundwater and soil, but it will also produce Green House Gases that will last for several decades [1]. 1 School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, Malaysia LNAPL products can be composed of pure organic compounds or, like diesel and gasoline, a complex mixture of numerous compounds.…”

Section: Introductionmentioning

confidence: 99%

“…The contamination will not only affect groundwater and soil, but it will also produce Green House Gases that will last for several decades [1]. 1 School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, Malaysia LNAPL products can be composed of pure organic compounds or, like diesel and gasoline, a complex mixture of numerous compounds. The various LNAPL components may dissolve in the aqueous phase in small concentrations, according to their respective water solubilities.…”

Section: Introductionmentioning

confidence: 99%

Soil Capillary Fringe Depression Caused by LNAPL Contamination in a Variational Hydraulic Gradient

2023

Int’l Conference Proceedings LLTETN-23, LACBE-23, ICASCE-23 &Amp; LMEHSS-23 Dec. 11-13, 2023 Lisbon (Portugal)

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A two-dimensional experiments were carried out to assess the capillary depression in the soil and the migration radius of the contaminant plume prior to lateral migration caused by a diesel spill, while considering various hydraulic gradients ranging from 0.714 to 3.571. A Simplified Image Analysis Method (SIAM) was utilised due to the dynamic nature of the experiment. Based on the study, deeper diesel migration occurs in larger spilled volumes because the pressure is high enough to overcome capillary forces, and it eventually depresses the capillary fringe layer. When comparing hydraulic gradients with high and low values, it can be observed that the low hydraulic gradient results in more capillary depression. As a result, pollutants would be significantly closer to the groundwater layer. The radius of the vertical contamination plume prior to the lateral migration reveals that even with a high hydraulic gradient, the maximum contamination plume size prior to the lateral migration is the same as any other hydraulic gradient. However, in the high hydraulic gradient, LNAPL migration accelerates with increasing hydraulic gradient, leading to soil and groundwater contamination at discharge points and throughout the entire groundwater pathway.

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Natural Source Zone Depletion of crude oil, gasoline, diesel and aviation gasoline petroleum in the same soil/aquifer system – An intensive intercomparison field study and simulation

Rayner,

Donn,

Davis

et al. 2024

Science of The Total Environment

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On quantifying global carbon emission from oil contaminated lands over centuries

Cited by 4 publications

References 49 publications

The Dynamics of Per- and Polyfluoroalkyl Substances (PFAS) at Interfaces in Porous Media: A Computational Roadmap from Nanoscale Molecular Dynamics Simulation to Macroscale Modeling

The Dynamics of Per- and Polyfluoroalkyl Substances (PFAS) at Interfaces in Porous Media: A Computational Roadmap from Nanoscale Molecular Dynamics Simulation to Macroscale Modeling

Soil Capillary Fringe Depression Caused by LNAPL Contamination in a Variational Hydraulic Gradient

Natural Source Zone Depletion of crude oil, gasoline, diesel and aviation gasoline petroleum in the same soil/aquifer system – An intensive intercomparison field study and simulation

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