Naturally occurring radon in groundwater can be used as an in situ partitioning tracer for locating and quantifying non-aqueous phase liquid (NAPL) contamination in the subsurface. When combined with the single-well, push-pull test, this methodology has the potential to provide a low-cost alternative to inter-well partitioning tracer tests. During a push-pull test, a known volume of test soluti...

BACKGROUND, AIM, AND SCOPE Polycyclic aromatic hydrocarbons (PAHs) are often found in oily wastewaters. Their presence is usually the result of human activities and has a negative effect on the environment. One important step in addressing this problem is to evaluate the effectiveness of PAH removal by biological processes since these are the most cost-effective treatments known today. Many tec...

Modifications to a stochastic differential equation (SDE) approach for modeling single and two phase NAPL flow are proposed which are intended to allow SDE modeling of the motion of air bubbles in porous media. Bubble flow and channeling are discussed along with bubble sticking, bubble coalescing, bubble breakup and air sparging.

A numerical model is presented for areal analyses of the three-dimensional (3-D) flow behavior of non-aqueous-phase liquids (NAPL's) in groundwater systems. The model is designed for specific application to chemical or petroleum spills and leaks, and remedial design and evaluation of a NAPL-contaminated site. The mathematical formulation is based on vertical integration of the 3-D two-phase flo...

Accurate estimation of the non-aqueous phase liquids (NAPLs) saturation such as chlorinated organic compounds (COCs) in aquifers is crucial for proper remediation contaminated groundwater. A combination conservative and partitioning tracers (PTs) are commonly used to assess NAPL saturations subsurface at COC release sites, using interwell tracer test (PITT). In this study, five fluorescent dyes...

Understanding the dissolution behavior of residual nonaqueous phase liquids (NAPLs) in soil and aquifer is essential for remediation activities related prediction models. In this study, impact wettability pore surfaces on NAPL was investigated natural porous media using X-ray microtomography. Three-dimensional pore-scale characteristics blobs were determined water-wet neutral-wet media. Time-re...

Many non-aqueous phase liquids (NAPLs) are expected to spread at the air-water interface, particularly under non-equilibrium conditions. In the vadose zone, this spreading should increase the surface area for mass transfer and the efficiency of volatile NAPL recovery by soil vapor extraction (SVE). Observations of spreading on water wet surfaces led to a conceptual model of oil spreading vertic...