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In-situ photolysis is one of the most promising ways to clean up a soil contaminated with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). This study focuses on the mathematical description and model devel...
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In-situ photolysis is one of the most promising ways to clean up a soil contaminated with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). This study focuses on the mathematical description and model development of the convective upward transport of an organic solvent driven by evaporation and photodecomposition at the surface as the major transport mechamsm in the clean up piocesed A fimte-element-based numencal model was ploposed to mcorpolate effects of multiphase flow on the distnbution of efich fiuid, gravity as a driving fnice, and the use of van Genutchen equation for mole accmate descnption of k-S-p Ielations This paper presents results of extensive numencal calculations conducted to Investigate the vanous parameters that playa role in the solvent migtation through a labmatory-scale unsaturated soli column The numel lcal results mdicate that gravity affects sigmficantly on the fiuids distnbution and evaporation for highly permeable solis The soil texture has a profound illfluence on the fluid saturation profile during evaporation process
The amount of solvent convective motion increases With increasing evaporation rates and decreasing Imtiai water saturation Simulations conducted in tills study have shown that the developed model is very useful in analyzing the effects of various parameters on the convective migration of an orgamc solvent m the soil environments
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