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US 6,742,961 B2Granted
Process for the removal of pollutants from the soil
AssigneeDsm IP Assets B.V.
InventorMartin W. J. Plum
Life of this patent
Estimating the term…
Abstract
A process for removing pollutants from soil with the aid of a stripping gas which involves (a) injecting the stripping gas into the soil at the level of and/or under the pollutant, (b) volatilizing the pollutant with the stripping gas, so that it rises to the ground level above the pollutant, (c) collecting and further treatment of the volatilized pollutant, a pneumatic screen being provided in the soil along the circumference of the polluted area.
Claims20
A process for removing pollutant from a contaminated area in a soil, said process comprising:
- (a) injecting, through one or more first pipes, stripping gas into said soil, wherein the outlets of said one or more first pipes are positioned within the circumference of said contaminated area and at the level of and/or under said pollutant in said contaminated area and;
- (b) injecting, through one or more second pipes, screening gas into said soil, wherein the outlets of said one or more second pipes are positioned outside the circumference of said contaminated area;
- and
- (c) volatilizing said pollutant with said stripping gas.
1 more element
Dependencies are inferred from the claim text.