NAPL water Articles
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Measurement of NAPL–water interfacial areas and mass transfer rates in two-dimensional flow cell
The nonaqueous-phase liquid (NAPL)–water interfacial area and the mass transfer rate across the NAPL and water interface are often key factors in in situ groundwater pollution treatment. In this study, the NAPL–water interfacial area and residual NAPL saturation were measured using interfacial and partitioning tracer tests in a two-dimensional flow cell. The results were compared with ...
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Comparative study of different formulations and solution methods for two phase flow in saturated porous media
Six models (Simulators) are formulated and developed with all possible combinations of pressure and saturation of the phases as primary variables. A comparative study between six simulators with two numerical methods, conventional simultaneous and modified sequential methods are carried out. The results of the numerical models are compared with the laboratory experimental results to study the ...
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Modelling dissolution of multi-component non-aqueous phase liquids using Pareto distributions
A distributed-site non-aqueous phase liquid (NAPL) dissolution model that can capture the physical process of dissolution is presented. The model uses a Pareto distribution of effective interfacial area and a correlation for the mass transfer. Model parameters are obtained using a formal constrained non-linear optimisation technique. The model is applied on effluent data from two soil column ...
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Grade `A` remediation - selective phase transfer technology cleans up college in Moncton, New Brunswick
Remedialing sensitive areas or population dense areas can be tricky at the best of times. So it's important to utilize a remediation technology with a proven record of reducing environmental and health and safely risks in order to avoid associated legal liability for project stakeholders, among other reasons. Ivey International Inc. is a Canadian company with offices in Campbell River, B.C., ...
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Successful Biostimulation Treatment of TCE DNAPL
The challenges posed by the presence of DNAPL are rooted in the unpredictable manner in which it spreads and moves through the subsurface, and the fraction of total contaminant mass it represents in an associated groundwater plume via sorbed, residual and drainable phases (typically greater than 99 percent). Under natural conditions, the dissolution of DNAPL is very slow, allowing groundwater ...
By Arcadis
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Organoclay permeable reactive barrier utilized to control napl contamination case study
Project : Bay Project - Union Pacifi c Railroad Location : Escanaba, MI Products : Bulk Organoclay, Reactive Core Mat Background: The groundwater at a former creosote wood treating site was contaminated by non-aqueous phase liquid (NAPL). The contaminated groundwater was a threat to the nearby fresh water bay when NAPL and soluble organics were showing on the surface of the bay. Challenge: As ...
By CETCO
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The Augustan aqueduct of Capua and its historical evolution
At his own expense Augustus built his own aqueduct, known as Aqua Iulia, for Capua, located in today's Campania region of southern Italy, which was in Roman times, one of the most important civitas of the empire. The course of this aqueduct and of its likely branches, destined for two small towns, Saticula and Calatia, is hypothesized, in part based on the re-use in the seventeenth century of ...
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Gabion Mattress Deployment at Former Manufactured Gas Plant Site
PROJECT: Island End River Sediment Cap LOCATION: Boston, MA RCM SQUARE FT: 35,000 ORGANOCLAY: 135,000 lbs CONTRACTOR: Sevenson Environmental Services, Inc. DESIGN CONSULTANT: Arcadis PRODUCTS: ORGANOCLAY®, REACTIVE CORE MAT®, TRITON® Marine Mattress THE CHALLENGE: The project is situated on a former manufactured gas plant (MGP) site located adjacent to the Boston Harbor. Previous ...
By CETCO
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Gabion mattress deployment at former manufacutured gas plant site case study
Project: Island End River Sediment Cap Location: Boston, MA Products: Organoclay Reactive Core Mat? Triton Marine Mattresses Background: The project is situated on a former manufactured gas plant (MGP) site located adjacent to the Boston Harbor. Previous remedial work included dredge and disposal in CAD cell and cap. Persistent sheen resulting from gas ebullition was apparent. Challenge: ...
By CETCO
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Properties and Behavior of Fuels
Fuel contaminants are generally nonhalogenated. Information presented for nonhalogenated VOCs and nonhalogenated SVOCs may also be appropriate for many of the fuel contaminants presented in this subsection. Contamination by fuel contaminants in the unsaturated zone exists in four phases: vapor in the pore spaces; sorbed to subsurface solids; dissolved in water; or as NAPL. The nature and extent ...
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Properties and Behavior of Nonhalogenated VOC`s
An important consideration when evaluating a remedy is whether the compound is nonhalogenated or halogenated. A nonhalogenated compound is one which does not have a halogen (e.g., fluorine, chlorine, bromine, or iodine) attached to it. The vendor of the technology being evaluated must be informed whether the compounds to be treated are nonhalogenated or halogenated. In most instances, the vendor ...
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Properties and Behavior of Halogenated VOCs
An important consideration when evaluating a remedy is whether the compound is halogenated or nonhalogenated. A halogenated compound is one onto which a halogen (e.g., fluorine, chlorine, bromine, or iodine) has been attached. The nature of the halogen bond and the halogen itself can significantly affect performance of a technology or require more extensive treatment than for nonhalogenated ...
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Halogenated Volatile Organic Compounds
Sites where halogenated VOCs may be found include burn pits, chemical manufacturing plants or disposal areas, contaminated marine sediments, disposal wells and leach fields, electroplating/metal finishing shops, firefighting training areas, hangars/aircraft maintenance areas, landfills and burial pits, leaking collection and system sanitary lines, leaking storage tanks, radioactive/mixed waste ...
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