Patent ID: 7704014
Filing Date: 2010-04-27
Classification: B01D,B09C,Y02A

Abstract:
1. Process for removing contaminants from contaminated soil with the aid of a stripping gas and with a biologically active layer being present in or on the soil, wherein the soil is provided with an impermeable layer at a surface of the soil which extends to the biologically active layer, and wherein the process comprises: (a) creating an air guiding layer in the surface of the soil subjacent to the impermeable layer, wherein the air guiding layer extends to the biologically active layer and includes a medium whose resistance is lower than the resistance of surrounding soil which lacks the medium, (b) injecting the stripping gas in the soil below the air guiding and impermeable layers and at least at a depth of the contaminants or below, (c) volatilising the contaminants with the stripping gas, and (d) allowing the stripping gas with the contaminants substantially to flow to the biologically active layer at the surface of the soil via the air guiding layer having the medium whose resistance is lower than that of the surrounding soil.