Natural source zone depletion of LNAPL: A critical review supporting modelling approaches

Lari, Kaveh Sookhak; Davis, Gordon B.; Rayner, J. C. W.; Bastow, Trevor P.; Puzon, Geoffrey J.

doi:10.1016/j.watres.2019.04.001

Cited by 82 publications

(44 citation statements)

References 163 publications

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“…In the following sections, Eqs (9), (10) and 13are solved for strip-shaped aquifers with different boundary configurations and flow conditions, after which we plot the capture envelopes of the well(s). First, the effects of various boundary configurations (Fig 1) on the shape and properties of the capture zones are investigated, then the effect of extraction rates and regional flow direction and rate are explored.…”

Section: Resultsmentioning

confidence: 99%

“…After pumping is initiated, the capture zone grows with time and reaches its maximum size at steady state, which defines the capture envelope [6]. Capture zones are important for aquifer management, groundwater remediation projects [7][8][9][10], surface-groundwater interactions, well head protection [11], water rights, and in delineating impacts on transboundary aquifers. For over-exploited aquifers (where annual extraction exceeds recharge), identification of capture zones underpins optimal pumping plans to recover and sustain the depleted storage [12].…”

Section: Introductionmentioning

confidence: 99%

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Multi-well capture zones in strip-shaped aquifers

2020

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-well capture zones in strip-shaped aquifers

2020

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“…STOMP generates numerical predictions regarding flow and transport phenomena in the subsurface, including non-isothermal conditions, fractured medias, multiphase systems, fluid trapping, and saturated and non-saturated contaminated environments [31]. Furthermore, the model includes the main processes and parameters that result in LNAPL constituents mass losses from the subsurface and, among the existing multiphase models of natural source zone depletion, STOMP is one of the feasible simulators to model the bioslurping technique [32].…”

Section: Numerical Analysismentioning

confidence: 99%

Numerical Modeling of Multiphase Extraction (MPE) Aiming at LNAPL Recovery in Tropical Soils

Bortoni

Schlosser

Barbosa

2019

Water

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Subsurface contamination by light non-aqueous phase liquids (LNAPL) is a widespread global problem that requires appropriate techniques to remediate soil and groundwater. In this paper, the subsurface transport over multiple phases (STOMP) model was used to simulate LNAPL multiphase flow and transport during multiphase extraction (MPE) application in two Brazilian tropical soils (silty sand and oxisol) contaminated by diesel. The model was applied to a hypothetical contamination site, with the initial LNAPL thickness observed in well extraction. The first part consisted of the MPE system sensitivity analysis, varying the applied vacuum and tip tube position. The Van Genuchten α parameter and hydraulic conductivity were the properties that most affected LNAPL saturation and fluid extraction volumes. Suitable applied vacuum and tip tube position parametrization was imperative for the efficiency of LNAPL extraction. After the definition of an appropriate MPE system configuration, simulations demonstrated that the immobile LNAPL saturation affected fluid extraction and diesel oil concentrations in aqueous and gas saturation. The model applied is able to predict LNAPL contaminant behavior in porous media during MPE technique application.

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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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Natural source zone depletion of LNAPL: A critical review supporting modelling approaches

Cited by 82 publications

References 163 publications

Multi-well capture zones in strip-shaped aquifers

Multi-well capture zones in strip-shaped aquifers

Numerical Modeling of Multiphase Extraction (MPE) Aiming at LNAPL Recovery in Tropical Soils

A Screening Model to Predict Entrapped LNAPL Depletion

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