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Showing 1 to 13 of 13 for “"NAPLs"”.
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Applicability of multiphase/multicomponent numerical models to simulate mass transfer of entrapped NAPLS: verification of code
Includes bibliographical references (pages 168-181).
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Development of hydrogel tracer beads and comparative tracer tests to better understand contaminant fate and transport in karst systems
… in the form of non-aqueous phase liquids (NAPLs). The fate and transport of NAPLs in karst aquifers is poorly understood. Tracer tests allow for qualitative characterization of hydraulic flow in the surface and subsurface, but their results may not be applicable to the movement of NAPL for …
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Solubilization of volatile organic compounds in edible nonionic surfactants
… and exist as Non-Aqueous Phase Liquids (NAPLs) in the subsurface. Pump-and-treat remediation is the most common technology used to remediate contaminated groundwater. However, experience has revealed that the traditional pump-and-treat remediation is impractical for treating NAPLs in the …
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A Self-Potential for Monitoring Self-Sustaining Treatment for Active Remediation (STAR)
… approach for Non-Aqueous Phase liquids (NAPLs) embedded in a porous medium. STAR is based on liquid smoldering combustion which destroys NAPLs while simultaneously generating heat due to the exothermic oxidation reaction. The technique is currently in use in several field pilot tests and …
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Innovative Methods for Solving Multicomponent Biogeochemical Groundwater Transport on Supercomputers
… in situ reductive dechlorination of halogenated NAPLs. For the test problems presented, it is shown that Jacobian-Free Newton-Krylov saved up to 33% in memory compared to conventional methods where the entire Jacobian matrix is stored. The Jacobian-Split preconditioner performed superior to …
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Assessing Various Technologies to Remediate a Hydrocarbon Contaminated Aquifer
Releases of nonaqueous phase liquids (NAPLs) to groundwater systems are a serious and widespread problem throughout the United States. Research was conducted to determine if numerical groundwater flow and transport models could evaluate the effectiveness of alternative remedial strategies to reduce …
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Numerical Modeling of Steam Flushing for Removal of Dense Nonaqueous Phase Liquids
… of each of these methods for removal of NAPLs from the subsurface and advantages and limitations of each method for ISTR technologies are reviewed. In the second part of this study, a series of previously performed two-dimensional laboratory experiments of steam flushing for removal of …
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Surfactant enhanced mobilisation of non-aqueous phase liquids
… technologies is limited by the low solubility of NAPLs. Surfactants can promote the enhanced removal of NAPL through mobilisation, a mechanism that relies on the reduction of interfacial tension (IFT) at the flushing solution/NAPL interface. The conditions governing mobilisation can be represented …
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Mass transfer from non-aqueous phase liquids to the aqueous phase in groundwater systems
… phase liquid (NAPL) in porous media. The NAPLs used in the experiments were composed of soluble and insoluble (inert) compounds. These experiments were designed to investigate the aqueous mass transfer of benzene, toluene, ethylbenzene, and xylene from and inert compound (soltrol or …
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NAPL remediation by vacuum-enhanced recovery: Laboratory and model evaluations
… (VER) to remediate non aqueous phase liquids (NAPLs) in the vadose zone. The first paper demonstrates the use of a pilot-scale two-dimensional laboratory soil cell and an automated dual-energy gamma ray attenuation system for the feasibility assessment of VER to remediate free-product NAPL …
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NAPL (Non Aqueous Phase Liquid) source characterization based on dissolved contaminant concentrations
… sources of Non-Aqueous Phase Liquids (NAPLs). Such chemicals are typically persistent sources of groundwater contamination that are difficult to characterize. This work addresses the feasibility of using dissolved concentration measurements to estimate the spatial distribution of an …
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Quantification of Parameters in Models for Contaminant Dissolution and Desorption in Groundwater
… rate-limited mass transfer from multicomponent NAPLs to the aqueous phase. Previous work has been limited to bench and intermediate scale findings which have been shown to inadequately translate to field conditions. Two studies were conducted in which numerical modeling was used to reproduce …