Sherwood correlation for dissolution of pooled NAPL in porous media

Sarikurt, Derya Aydin; Gokdemir, Cagri; Copty, Nadım K.

doi:10.1016/j.jconhyd.2017.10.001

Cited by 18 publications

(27 citation statements)

References 26 publications

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“…These results are in line with the findings of study conducted by Oostrom et al (2006) Figure 5 with the coefficient of determination (R 2 ) value of 0.998. This kind of high correlation between Sh and e P was also reported in a recent study by Sarikurt et al (2017).…”

Section: Vapor Phase Concentrationssupporting

confidence: 87%

“…Thus, a dynamic groundwater table accelerates the dissolution of pure phase LNAPL resulting in high concentration of LNAPL plume (Legout et al 2009). The dissolved LNAPL plume then moves along with groundwater and forms a polluted zone which features with varying concentration levels (Neale et al 2000;Rolle et al 2009;Zhang et al 2014;Zhou et al 2015;Sarikurt et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments

Gupta

Yadav

2019

J. Environ. Eng.

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The focus of this study was to investigate fate and transport of toluene, a light non-aqueous phase liquids (LNAPL), in subsurface under dynamic groundwater table conditions. A series of experiments were conducted using two-dimensional (2-D) sand tank setup having the dimension of 125cm L×90cm H×10cm W and integrated with an auxiliary column of inner diameter 14 cm and height 120 cm. In the beginning a steady state flow and LNAPL transport experiment was conducted under stable groundwater table condition. Thereafter, three groundwater table fluctuation experiments were conducted by rising and falling groundwater table in 2, 4 and 8 hours to maintain a rapid, general, and slow fluctuation conditions respectively. Pure phase of toluene was injected at the rate of 1mL/minute for a total duration of 5 minutes. The soil-water and soil vapor samples were periodically collected and analyzed for toluene concentrations. Later, the representation of 2-D sand tank setup was numerically simulated to get the response of flow and the LNAPL transport under varying groundwater table conditions. The analysis of the results show that a large LNAPL pool area (250 cm 2) gets developed under rapid fluctuating groundwater condition which significantly enhances the dissolution rate and contributes for a high concentration of

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Section: Vapor Phase Concentrationssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments

Gupta

Yadav

2019

J. Environ. Eng.

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“…Similar to the original paper, a two‐dimensional lattice pore network with cubical pore bodies and properties summarized in Aydin‐Sarikurt et al (; Table ) is set up. The authors (Aydin‐Sarikurt et al, ) conducted glass bead experiments, which can be represented sufficiently accurately by the formulation presented above.…”

Section: Methodsologymentioning

confidence: 99%

“…Others may be rate limiting due to chemical reactions or physical impedances (Powers, ). Significant work has been conducted in recent years especially in the field of nonaqueous phase liquid (NAPL) remediation to elucidate the factors that affect this process (e.g., Aydin‐Sarikurt et al, ; Babaei & Copty, ; Brusseau et al, ; Carroll et al, ; Carroll & Brusseau, ; Held & Celia, ; Imhoff et al, ; Keller & Sirivithiyapakorn, ; Kokkinaki et al, ; Nambi & Powers, ; Pan et al, ; Saba & Illangasekare, ), and the review papers of Agaoglu et al () and Essaid et al () have been dedicated to this topic. The characteristic lengths of the conducted studies range from the pore scale to the mesoscale and further on to the field scale.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pore‐Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two‐Scale Numerical Simulation Study

Aminnaji

Rabbani

Niasar

et al. 2019

Water Resources Research

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Interphase mass transfer or dissolution coefficient of nonaqueous phase liquids (NAPL) is an important parameter in predicting the transport of contaminant species in porous media. While the literature offers valuable insights into the dependence of this coefficient on different parameters at the continuum scale (e.g., contaminant saturation and Darcy velocity), effects of pore‐scale heterogeneity on macroscopic dissolution coefficient have received little attention. In this work a three‐dimensional pore‐scale model is developed to simulate interphase mass transfer over different synthetic pore network structures with various pore radii correlation lengths. The pore network modeling simulates dissolution of immobile NAPL into water (single phase) through diffusive throats for the water‐NAPL interface. The impacts of pore network spatially correlated heterogeneities, NAPL saturation/distribution, and aqueous phase velocity on NAPL mass transfer coefficient and water‐NAPL interfacial surface area are studied. These macroscopic properties are then employed in two‐dimensional continuum‐scale domains formed by concatenating 20 by 20 pore networks in x and y directions. The results highlight the impact of pore‐scale heterogeneity on the distribution of NAPL and subsequently on the dissolution rate (i.e., dissolution coefficient). An uncorrelated distribution of pore radii consistently leads to higher NAPL dissolution coefficient than spatially correlated heterogeneity. The results of continuum modeling show that NAPL dissolution rates are only different between domains formed by correlated and uncorrelated pore networks at very high flow rates and Darcy velocities. However, for typical values of Darcy velocity in groundwater systems, variation in mass transfer coefficient due to pore‐scale heterogeneity is minimal for efficient mass removal.

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“…Teramoto and Chang [15], Mackay et al [23], Huntley and Beckett [24], and Thornton et al [25], among others, demonstrated that the continuous loss of water-soluble compounds leads to continuous depletion of LNAPL in the source zone. Actually, there are a large number of analytical and numerical approaches, varying in scale and complexity, to simulate NAPL dissolution into the aqueous phase [18,[26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Most of these approaches are based on empirical Sherwood-Gilland models that do not consider explicitly the NAPL/water interface area and were exclusively validated by lab-scale experiments.…”

Section: Introductionmentioning

confidence: 99%

A Screening Model to Predict Entrapped LNAPL Depletion

Teramoto

Chang

2020

Water

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Accidental leakage of hydrocarbons is a common subsurface contamination scenario. Once released, the hydrocarbons migrate until they reach the vicinity of the uppermost portion of the saturated zone, where it accumulates. Whenever the amplitude of the water table fluctuation is high, the light non-aqueous phase liquid (LNAPL) may be completely entrapped in the saturated zone. The entrapped LNAPL, comprised of multicomponent products (e.g., gasoline, jet fuel, diesel), is responsible for the release of benzene, toluene, ethylbenzene, and xylenes (BTEX) into the water, thus generating the dissolved phase plumes of these compounds. In order to estimate the time required for source-zone depletion, we developed an algorithm that calculates the mass loss of BTEX compounds in LNAPL over time. The simulations performed with our algorithm provided results akin to those observed in the field and demonstrated that the depletion rate will be more pronounced in regions with high LNAPL saturation. Further, the LNAPL depletion rate is mostly controlled by flow rate and is less sensible to the biodegradation rate in the aqueous phase.

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Sherwood correlation for dissolution of pooled NAPL in porous media

Cited by 18 publications

References 26 publications

Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments

Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments

Effects of Pore‐Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two‐Scale Numerical Simulation Study

A Screening Model to Predict Entrapped LNAPL Depletion

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