نتایج جستجو برای: napl
تعداد نتایج: 201 فیلتر نتایج به سال:
A study was conducted on the effect of two different biological factors, microbial surfactants and biodegradation, on the kinetics of partitioning of polycyclic aromatic hydrocarbons (PAHs) from nonaqueous-phase liquids (NAPLs). The effect of rhamnolipid biosurfactants on partitioning into the aqueous phase of naphthalene, fluorene, phenanthrene, and pyrene, initially dissolved in di-2-ethylhex...
Organic liquids are common polluters of the subsurface environment. Once released, these nonaqueous phase liquids (NAPLs) tend to become entrapped within soils and geologic formations where they may serve as long-term contaminant reservoirs. The interphase mass transfer from such entrapped residuals will ultimately control environmental exposure levels as well as the persistence and/or remedial...
There is limited data on the clinical, cellular and molecular changes in relapsed acute promyeloytic leukemia (RAPL) in comparison with newly diagnosed cases (NAPL). We undertook a prospective study to compare NAPL and RAPL patients treated with arsenic trioxide (ATO) based regimens. 98 NAPL and 28 RAPL were enrolled in this study. RAPL patients had a significantly lower WBC count and higher pl...
Multicomponent nonaqueous phase liquid (NAPL) contaminants that are mixtures of polycyclic aromatic hydrocarbons (PAHs) are examined using UNIFAC. The NAPL phase activity coefficients for constituent compounds of four different coal tar materials are estimated. The group contribution approach is adapted to describe representative molecular structures of the uncharacterized fractions of the tar ...
Subsurface contaminants such as coal tar, creosote, diesel fuel, and other petroleum-derived materials typically exist as very complex chemical mixtures. Risk assessment is useful for site management if a single metric can represent the composition-dependent risk profile of the mixture. This paper examines the factors governing human health risk assessment for multicomponent nonaqueous phase li...
Abstract Interphase mass transfer is an important solute transport process in two-phase flow porous media. During flow, hydrodynamically stagnant and flowing zones are formed, with the ones being adjacent to interfaces through which interphase happens. Due existence of these vicinity interface, coefficient decreases a certain extent. There seems be phenomenological correlation between extent zo...
The release of nonaqueous phase liquids (NAPLs) to the subsurface environment can create long-term sources of ground water contamination as the NAPL slowly dissolves into ground water (Mercer and Cohen 1990; Cohen and Mercer 1993). Effective remediation of subsurface NAPL contamination requires that NAPL be accurately located and saturations quantified. This is particularly important for dense ...
The effects of groundwater table fluctuation (GTF) on the remediation a petrochemically polluted riverside using soil vapor extraction (SVE) were investigated. migration and transformation benzene, toluene, ethylbenzene, o-xylene (BTEX) in cases natural attenuation, SVE without GTF, with GTF simulated TMVOC model. results showed that optimized well pressure influencing radius target site 0.90 a...
Impact of Wettability Alteration on the Front Instability of Immiscible Displacement in Porous Media
Wettability alteration that occurs as a result of changing the brine composition or using chemicals lower interfacial tension can significantly alter mobility nonaqueous liquid (NAPL)/water phases. Here, we show including dynamic wettability alternation (moving from non-water-wet to water-wet) interpolating between two sets relative permeability curves may create an unstable displacement reside...
Ground contamination by mineral oil and hydrocarbons is a serious problem worldwide. These non-aqueous phase liquid (NAPL) represents long-term sources to the soil, groundwater, ecological environment. In existing numerical simulation models utilized in most programs, relation between porosity hydraulic properties of unsaturated soils highly simplified as nonlinear. However, nonlinear effect on...
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