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3D NUMERICAL MODELLING OF A PULSED PUMPING PROCESS OF A LARGE DNAPL POOL: IN SITU PILOT-SCALE CASE STUDY OF HEXACHLOROBUTADIENE IN A KEYED ENCLOSURE
Giraud, Q., J. Goncalves, B. Paris, A. Joubert, S. Colombano, and D. Cazaux.
Journal of Contaminant Hydrology 214:24-38(2018)

A low-permeability keyed enclosure was built at the location of hexachlorobutadiene DNAPL source zone to isolate a finite volume of soil. A 3-month pulsed-pumping process was applied inside the enclosure to extract the DNAPL. No water was extracted during the process, and a total volume of ~20 m3 of pure DNAPL was recovered. By using the 3D and multiphase flow simulator TMVOC, a conceptual model was elaborated and generated with the pre/post-processing tool mView. Numerical simulations reproduced the pulsed pumping process and showed an excellent match between simulated and field data of DNAPL cumulated pumped volume, and reasonable agreement between modeled and observed data for the evolution of the water/DNAPL interface elevations at the two wells. These results may be relevant to DNAPL pumping system optimization.



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