Patent ID: 6321837
Filing Date: 2001-11-27
Classification: B09C,C02F,E21B

Abstract:
An in-situ method of eliminating harmful substances from polluted groundwater and/or perched water contained in soils, which comprises:A. establishing at least one well in said polluted water, said well having a head pipe, a well head and a screen tour, said head pipe extending at least 2 inches below the water table defining a natural water level;B. applying a partial vacuum to said well head to create a pressure drop of at least 200 mbar to form a whirl chamber in said head pipe extending from said natural water level in said soil to an elevated water level inside the head pipe; andC. injecting an extracting agent into said polluted water in said screen tour to lift volatile harmful substances out of said well, while excluding ambient air from said well.