An adaptive moving mesh method is presented for numerical simulation of two dimensional groundwater flow and transport problems. A selection of problems are considered, including advection dominated chemical transport and reaction, solute transport from contamination sources, transport of nonaqueous phase liquids (NAPLs) in an aquifer, and coupling of groundwater flow with NAPL transport. Numer...

Models can be powerful tools to aid interpretation of data and for prediction of the fate of contaminants, as in the case of petroleum hydrocarbons in groundwater environments. Here we describe the transport processes that can be more or less dominant at different stages in the ‘life’ of a petroleum contaminant spill in groundwater, such as advection, dispersion, dissolution from free-phase non...

Determination of the distribution and quantity of non-aqueous phase liquids (NAPL) in the subsurface requires accurate evaluation of the effective parameters governing flow in porous media. A great deal of the work done towards the development of effective parameters has focused on analysis techniques for adapting parameters determined from a small-scale to a fieldscale system. These techniques...

The use of in situ techniques in soil remediation is still rare in Finland and most other European countries due to the uncertainty of the effectiveness of the techniques especially in cold regions and also due to their potential side effects on the environment. In this study, we compared the biostimulation, chemical oxidation, and natural attenuation treatments in natural conditions and pilot ...

Biological treatments are used in gas treatment when containing Volatile Organic Compounds (VOC). Key factor to enhance efficiency is maximize mass transfer from liquid. VOCs can be removed the flow by absorption a separate gas–liquid contactor before entering Two-Phase Partitioning Bioreactor (TPPB) (Two-stage unit). The Non-Aqueous Phase Liquid (NAPL), silicone oil this study, able solubilize...

Rapid in situ degradation of chlorinated solvents present as nonaqueous phase liquids (NAPL) can be accomplished using reactive zerovalent nanoiron particles. Prior studies have shown that nanoiron transport in the subsurface is limited, and successful delivery of the nanoiron is essential for effective remediation. Here, the physical properties of bare and modified nanoiron are measured, and l...