|Keywords||DNAPL, saturated porous medium, image analysis, mass reduction, source morphology, dissolved plume.|
|Abstract||Sources characterization is a fundamental step to identify the most appropriate strategy for remediation of sites contaminated from DNAPLs, because the size of the accumulations and their morphology strongly influence, together with the hydrogeological conditions, the processes of mass transfer. For this purpose laboratory experiments, in a 2-D apparatus, have been carried out with different values of water flow velocity. An image analysis procedure has been used to determine saturation distribution of DNAPL source (free DNAPL), to evaluate source morphology and mass reduction. This analysis coupled with the measure of dissolved concentration returns important information about the influence of initial conditions (DNAPL mass and shape) and boundary conditions (hydraulic gradient) on the mass reduction and DNAPL dissolution processes. Experimental results show that the mass transfer, in the case of high water flow speed, is flow controlled. In the case of natural water flow conditions, instead the mass transfer is meanly governed from the rate of dissolution that occurs within the source in condition of no water flow. The water circulation, being small, does not significantly influence the process of mass transfer, which is controlled by the sources morphology. These aspects should be considered in all these approach of remediation based on source treatments or which consider an increase in water circulation (es pump & treat).|
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|Name||Affiliation||Home page||Total pubs|
|Petrangeli-Papini M||Department of Chemistry - Universiy of Rome Sapienza - P.le Aldo Moro, 8 – I-00185-Rome, Italy||1|
|Uciano A||Department of Hydraulics, Transportations and Roads - University of Rome Sapienza - Via Eudossiana 18- I- 00184 – Rome, Italy||1|
|Viotti P||Department of Hydraulics, Transportations and Roads - University of Rome Sapienza - Via Eudossiana 18- I- 00184 – Rome, Italy||2|
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