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Væsentligste patenter for ISTD-anvendelse i Danmark

FILED AND/OR GRANTED INTERNATIONAL PATENT APPLICATIONS

(i.e., OUTSIDE THE USA)

Title: Remediation Method

Inventors: Stegemeier, G.L., Rouffignac, E. P. de, Vinegar, H. J.

Abstract: A method is provided to remove volatile contaminates from a contaminated volume of earth, the contaminated volume lying above a non-contaminated layer of earth, the method including the steps of: penetrating the contaminated volume with at least one wellbore so that a wellbore penetrates the contaminated volume and the non-contaminated layer; applying heat from the wellbore within the non-contaminated layer to the non-contaminated layer until the temperature of a substantial portion of the noncontaminated layer is about the boiling point of liquids within the non-contaminated layer; and applying heat from the wellbore within the contaminated volume to the contaminated volume wherein the temperature of the contaminated volume rises to about the boiling point of liquids in the contaminated layer after a substantial portion of the non-contaminated layer is about the boiling point of water within the non-contaminated layer at the pressure of the non-contaminated layer.

Title: Thermally Enhanced Soil Decontamination

Inventors: Rouffignac, E. P. de, Stegemeier, G.L., Vinegar, H. J.

Abstract: A method is provided to remove contaminants from contaminated soil.  The method may include withdrawing vapors from a vapor extraction well, estimating the amount of water vapor removed from the contaminated soil in the vapors being withdrawn from the vapor extraction well, and applying heat to the contaminated soil from a plurality of heater wells at a rate not greater than that which would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, which may include multiple rings of heaters around each vapor extraction well.

Title: Soil Remediation using Heated Vapors

Inventors: Stegemeier, G.L., Vinegar, H. J.

Abstract: Methods are provided for remediating contaminated soil. The methods may include collecting contaminated soil at a plurality of treatment sites. The contaminated soil at one or more of the plurality of treatment sites may be at least partially contained. Vapors produced from heating soil at one site may be used to heat contaminated soil at another site. A fluid directed to a portion of heated contaminated soil may accelerate heat transfer through the site of contaminated soil or through another site of contaminated soil. A method may include heating contaminated soil from more than one site at substantially the same time. Heating contaminated soil from more than one site at substantially the same time may include in situ and ex situ treatment at a common location.

PCT: WO 2004/103588

Title: Remediation of Mercury Contamination

Inventors: Stegemeier, G.L., Vinegar, H. J.

Abstract: An in situ soil remediation system may be used to remove or reduce levels of mercury contamination within soil.  The soil remediation system may also remove or reduce levels of other contaminants within the soil.  Mercury may be vaporized within the soil by a heating system.  The vaporized mercury may pass through heated risers that elevate the vaporized mercury.  After the vaporized mercury passes from the heated risers, the vaporized mercury may be allowed to cool, condense and flow downward to a treatment facility.  Removing mercury from the soil as a vapor may provide an economical, safe and efficient way to remediate mercury contaminated soil.

Title: Heater Element for Use in an In Situ Thermal Desorption Soil Remediation System

Inventors: Stegemeier, G.L., Vinegar, H. J.

Abstract: An in situ thermal desorption (ISTD) soil remediation system may be used to remove or reduce contamination within soil. Heat may be transferred to the soil from resistively heated, bare metal heater elements. The heater elements may be placed directly within the soil. Alternately, the heater elements may be suspended within casings. The heater elements may be conductive heaters, or the heater elements may be radiative heater elements. The ISTD soil remediation system may include temperature-resistant, chemical resistant, flexible conduits that transport off-gas removed from the ground to a treatment facility. A residence time of off-gas within the conduits may be sufficient to allow the off-gas to cool so that the off-gas may pass to a treatment facility through a manifold and piping made of polymeric material.

PCT: WO 01/78914

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Version 1.0 Oktober 2007, © Miljøstyrelsen.