Thermally enhanced soil decontamination method

B - Operations – Transporting – 09 – C

Patent

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Details

B09C 1/06 (2006.01)

Patent

CA 2462215

A method is provided to remove contaminants from contaminated soil (102). The method may include withdrawing vapors from a vapor extraction well (202), estimating the amount of water vapor removed from the contaminated soil (102) in the vapors being withdrawn from the vapor extraction well, and applying heat to the contaminated soil from a plurality of heater wells (203) at a rate not greater than that which would vaporize the estimated amount of water vapor. The permeability of the soil may thereby increase by the application of heat. Six or more heat injection wells may be provided for each vapor extraction well, and the heat injection wells may be placed and energized in a regular pattern around the vapor extraction well (202), which may include multiple rings of heaters around each vapor extraction well.

La présente invention concerne un procédé qui permet d'éliminer les contaminants d'un sol contaminé (102). Selon le procédé précité, on peut extraire des vapeurs d'un puits d'extraction de vapeur (202), estimer la quantité de vapeur d'eau enlevée du sol contaminé (102) dans les vapeurs qui sont extraites du puits d'extraction de vapeur, et appliquer de la chaleur sur le sol contaminé à partir d'une pluralité de puits chauffants (203) à une vitesse inférieure ou égale à celle à laquelle la quantité estimée de vapeur d'eau s'évaporerait. L'application de chaleur peut augmenter la perméabilité du sol. On peut prévoir au moins six puits d'injection de chaleur pour chaque puits d'extraction de vapeur, que l'on peut disposer et alimenter en un motif régulier autour du puits d'extraction de vapeur (202), ce qui fait que chaque puits d'extraction de chaleur peut être entouré de multiples anneaux de puits chauffants.

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