varying degrees of water solubility. Some additives (e.g., methyl tertiary-butyl ether and alcohols) are highly soluble. Other components (e.g., benzene, toluene, ethylbenzene, and xylenes) are slightly soluble. Many components (e.g., ndodecane and n-heptane) have relatively low water solubility under ideal conditions. Physical and chemical properties which affect transport and fate of selected...

The entrapment of residual hydrocarbon globules by water table fluctuations can produce a long-term contamination threat to groundwater supplies that is difficult to remove. The mobilization of entrapped hydrocarbon globules depends on the balance between capillary and gravitational forces represented by the Bond number. It is important to estimate the potential for hydrocarbon entrapment at a ...

The intergovernmental panel on climate change (IPCC) predicts significant changes in precipitation patterns, an increase temperature, and groundwater level variations by 2100. These are expected to alter light non-aqueous phase liquid (LNAPL) impacts since fluctuations temperature known influence both the mobility release of LNAPL compounds air groundwater. Knowledge these potential effects is ...

varying degrees of water solubility. Some additives (e.g., methyl tertiary-butyl ether and alcohols) are highly soluble. Other components (e.g., benzene, toluene, ethylbenzene, and xylenes) are slightly soluble. Many components (e.g., ndodecane and n-heptane) have relatively low water solubility under ideal conditions. Physical and chemical properties which affect transport and fate of selected...

An analytical model is used to simulate the effects of partial source removal and plume remediation on ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) plumes at contaminated underground storage tank (UST) sites. The risk posed by EDB, 1,2-DCA, and commingled gasoline hydrocarbons varies throughout the plume over time. Dissolution from the light nonaqueous phase liquid (LNAPL) determin...

A multi-phase and multi-component numerical simulator assessed the removal efficiencies of light non-aqueous phase liquid (LNAPL) consisting benzene, toluene, ethylbenzene, xylene-p. Scenarios LNAPL-spilling, natural distribution, remediation stages were designed in full-physics modeling. For LNAPLs remediation, a extraction (MPE) steam injection technique employed. The computed by systematical...

to examine hydraulics of lnapls in soil, the retention curves of diesel fuel and water were both determined by hanging column method. the soil retention parameters were obtained based on van genuchten, brooks-corey and campbell’s models. in addition, the soil hydraulic conductivity for both fluids were predicted based on mualem- brooks-corey, burdine- brooks-corey, mualem-van genuchten and camp...

Abstract Climate and groundwater are always in a state of dynamic equilibrium. Subsurface systems contaminated by light non-aqueous phase liquid (LNAPL) present challenge to understand the overall impact water table dynamics, due various interacting mechanisms, including volatilization, LNAPL mobilization/dissolution along flow direction oscillating redox conditions. We investigated fluctuation...

Abstract In the management of light non–aqueous phase liquid (LNAPL)‐contaminated ground, numerical simulation is widely used to analyze LNAPL flow in unsaturated soil (vadose) zone. Porosity effects on hydraulic properties soils are highly simplified existing mathematical models. Some important features, such as nonlinear relation between porosity and permeability/displacement pressure, cannot...