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| Number | Title | Issue Date |
| 7360966 | Methods and systems for remediating contaminated soil A system and method for remediation of contaminated soil are provided. The system comprises a soil remediation cell of contaminated soil and a plurality of multi-functional conduits located within the contaminated soil. Each multi-functional conduit defines a reacti... | 04/22/2008 |
| 7360595 | Method and system for underground treatment of materials A method for underground treatment of subsurface materials comprises providing an injection pattern and a recovery pattern, the injection pattern and the recovery pattern located proximate to a subsurface treatment zone and at least one of the injection pattern and ... | 04/22/2008 |
| 7058519 | Photometrically modulated delivery of reagents A process system adapted for processing of or with a material therein. The process system includes: a sampling region for the material; an infrared photometric monitor constructed and arranged to transmit infrared radiation through the sampling region and to respons... | 06/06/2006 |
| 7004678 | Soil remediation with heated soil 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. The method m... | 02/28/2006 |
| 6971820 | Microblower assisted barometric valve A gas exchange apparatus is provided which provides for both passive fluid flow and blower associated fluid flow through a barometric valve. A battery powered blower is provided which allows for operation of the barometric valve during times when the barometric valv... | 12/06/2005 |
| 6962466 | Soil remediation of mercury contamination 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 ... | 11/08/2005 |
| 6951436 | Thermally enhanced soil decontamination method 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a vapor extraction well, estimating the amount of water vapor removed from the contaminated soil in the vapors being withdrawn from the vapor extractio... | 10/04/2005 |
| 6945734 | In-situ thermochemical solidification of dense non-aqueous phase liquids A method for in-situ dense non-aqueous phase liquids treatment in which a subsurface source area comprising at least one rapid release contaminant is located and free water removed therefrom. The subsurface source area is then heated to a temperature suitable for ex... | 09/20/2005 |
| 6881009 | Remediation of soil piles using central equipment 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. Contaminated... | 04/19/2005 |
| 6854929 | Isolation of soil with a low temperature barrier prior to conductive thermal treatment of the soil Freeze wells may be used to isolate an area for soil remediation. Freeze wells may form a frozen barrier around a treatment area. The frozen barrier may inhibit fluid from entering into the treatment area. The frozen barrier may also inhibit migration of contaminati... | 02/15/2005 |
| 6824328 | Vapor collection and treatment of off-gas from an in-situ thermal desorption soil remediation An in situ thermal desorption system may be used to remove contamination from soil. Off-gas removed from the soil may be transported from the soil to a treatment facility by high temperature hoses and plastic piping. The use of high temperature hose and plastic pipe... | 11/30/2004 |
| 6632047 | Heater element for use in an in situ thermal desorption soil remediation system 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 wit... | 10/14/2003 |
| 6485232 | Low cost, self regulating heater for use in an in situ thermal desorption soil remediation system An in situ thermal desorption soil remediation system may be used to remove contamination from soil. Heat may be applied to the soil by metallic strip heaters that have large cross sectional areas as compared to conventional heater elements. The strip hea... | 11/26/2002 |
| 6419423 | Method for remediating near-surface contaminated soil A method is provided to remove contaminants from near-surface contaminated soil, the method including the steps of: placing a plurality of metal sheets on the surface above the contaminated soil to form a contiguous cover over at least a portion of the co... | 07/16/2002 |
| 6413016 | Methods of extracting liquid hydrocardon contaminants from underground zones Methods of extracting liquid hydrocarbon contaminants from underground zones are provided. The methods are basically comprised of the steps of introducing a hot purge gas into an underground zone containing a pool of liquid hydrocarbon contaminants whereb... | 07/02/2002 |
| 6183162 | Method for treating vapors and liquids recovered from a subsurface remediation process A continuous process for removing organic contaminants from a subsurface formation. Including the steps of (a) injecting steam into the subsurface formation via an injection conduit, (b) removing a liquid stream from the subsurface formation via a liquid ... | 02/06/2001 |
| 5975799 | Electro-osmotic infusion for joule heating soil remediation techniques Electro-osmotic infusion of ground water or chemically tailored electrolyte is used to enhance, maintain, or recondition electrical conductivity for the joule heating remediation technique. Induced flows can be used to infuse electrolyte with enhanced ion... | 11/02/1999 |
| 5813799 | Combustion process and apparatus for removing volatile contaminants from groundwater or subsurface soil Combustion is used as a source of heat to remove polluting volatiles from contaminated groundwater and subsurface soil. A burner assembly is placed in a well, either in or out of an aquifer, to produce steam and/or hot air and/or hot water which drives of... | 09/29/1998 |
| 5788412 | Method for in situ contaminant extraction from soil The present invention involves heating of sub-surface soil by use of conduction heating intermediate the injection and extraction wells of a vacuum extraction system. This conduction heating is accomplished by implanting heat exchange units, such as a cir... | 08/04/1998 |
| 5769569 | In-situ thermal desorption of heavy hydrocarbons in vadose zone An in-situ thermal desorption system and process is utilized for mobilization and removal of nonvolatile and semi-volatile hydrocarbons from contaminated soil in the vadose zone. Persistent hydrocarbons are thermally desorbed by direct heating of the cont... | 06/23/1998 |
| 5664911 | Method and apparatus for in situ decontamination of a site contaminated with a volatile material A method for removing a contaminant from a treatment region of a contaminated region of a site in the earth having water therein and being contaminated with the contaminant includes heating the earth by establishing an electric field through the treatment... | 09/09/1997 |
| 5660500 | Enhanced deep soil vapor extraction process and apparatus utilizing sheet metal pilings A system for in situ decontamination of contaminated soil in a contaminated zone comprising: a. a metal section placed in the contaminated soil, b. a heating means attached to said metal section for heating said metal section, and c. an extraction system adjac... | 08/26/1997 |
| 5641245 | Apparatus for passive removal of subsurface contaminants An apparatus is provided which passively removes contaminated gases from a subsurface. The apparatus includes a riser pipe extending into a subsurface which has an exterior end in fluid communication with a valve. When well pressure is greater than atmosp... | 06/24/1997 |
| 5441365 | Apparatus and process for treating contaminated soil gases and liquids Apparatus for extracting contaminants from a stream comprising a contaminant-containing mixture of liquids and gases which comprises: (a) a contaminant-containing mixture input; (b) a vapor-liquid separator receiving the contaminant-containing mixture fro... | 08/15/1995 |
| 5375539 | Efficient removal of volatile compounds from soil or water The invention is a highly efficient soil and/or water treatment system including its own power source, such as an internal combustion engine, in which heat from all heat sources and heat sinks is exchanged through a mutual heat exchanger circuit. The inve... | 12/27/1994 |
| 5348422 | Methods for the formation and operation of an in situ process reactor A hazardous waste site remediation process for decontamination of petrochemical and other toxic waste containing sites comprises in situ conversion of the site to a self contained process reactor which is then selectively operated by feeding a variety of ... | 09/20/1994 |
| 5340236 | Burn chamber for use in a system for heated air extraction of contaminants from a soil stack A burn chamber for a recirculating system for remediation of contaminated soil, the burn chamber including a burn chamber housing, the housing having an inlet (152) and an opposing outlet (164). Contaminate-containing vapors moving into the interior of th... | 08/23/1994 |
| 5318698 | Arrangement for cleaning contaminated ground water An arrangement for cleaning contaminated ground water and a ground region through which it flows comprises a shaft extending to a region of ground water to be cleaned, the shaft having a shaft wall with two water permeable wall regions located above and b... | 06/07/1994 |
| 5318116 | Vacuum method for removing soil contaminants utilizing thermal conduction heating An in situ method for removal of contaminants from soil imposes a vacuum on the soil through perforated heater wells that are positioned in the soil. The heater wells heat the soil to elevated temperatures by thermal conduction. The heater wells are perme... | 06/07/1994 |
| 5271693 | Enhanced deep soil vapor extraction process and apparatus for removing contaminants trapped in or below the water table An Enhanced Deep Soil Vapor Extraction Process and Apparatus utilizes heaters placed into the soil at least to the depth of contamination and a vapor/condensate extraction system that withdraws volatilized contaminant vapors from the subsurface and any co... | 12/21/1993 |
| 5244310 | In-situ soil heating press/vapor extraction system An in-situ soil heating/treatment system consists of a frame to which are attached a plurality of heater spikes and a plurality of tubular, perforated vapor extraction spikes. An insulated shield covers the frame and internal components. The spikes, which... | 09/14/1993 |
| 5213445 | System for heated air extraction of contaminants from soil stack The recirculating system includes a soil stack (10), which is formed by sequential layers of contaminated soil from a site and hot air pipes (22, 26, 32, 34). A plurality of vapor collection pipes (40, 46) is laid over the top of the stack, with a sealing... | 05/25/1993 |
| 5209604 | Soil decontamination The top layers of soil contaminated with halogenated organic chemicals are remediated by initial heating at moderate temperature and reduced pressure to remove soil moisture and volatile contaminants and subsequently heating the soil of minimum clay conte... | 05/11/1993 |
| 5190405 | Vacuum method for removing soil contaminants utilizing thermal conduction heating An in situ method for removal of contaminants from soil imposes a vacuum on the soil through perforated heater wells that are positioned in the soil. The heater wells heat the soil to elevated temperatures by thermal conduction. The heater wells are perme... | 03/02/1993 |
| 5169263 | In-situ soil decontamination process with sub-surface vapor recovery An improved in-situ soil decontamination heating process utilizes a submerged vapor recovery system comprising perforated or slotted pipes buried in the contaminated soil or below the depth of contamination. The pipes may be buried in a manifold arrangeme... | 12/08/1992 |
| 5065819 | Electromagnetic apparatus and method for in situ heating and recovery of organic and inorganic materials The disclosure describes an electromagnetic apparatus, and a method of use thereof, for simultaneously generating near-uniform heating in a subsurface formation and simultaneously recovering organic and inorganic materials through the apparatus itself. Th... | 11/19/1991 |
| 4984594 | Vacuum method for removing soil contamination utilizing surface electrical heating An in-situ method is disclosed for removing contaminants from surface and near-surface soil by imposing a vacuum on the soil beneath a impermeable flexible sheet and then heating the soil with an electric surface heater that is positioned on the soil surf... | 01/15/1991 |
| 4846134 | Apparatus and method for removing and burning hydrocarbon vapors using an internal combustion engine An apparatus and method are disclosed for accumulating hydrocarbon vapor and rendering the vapor environmentally safe by combustion. An internal combustion engine is attached to an interface which accumulates hydrocarbon vapor present in the soil after a ... | 07/11/1989 |
| 4844807 | Insitu hazardous waste treating apparatus and method of using same The insitu method of detoxifying a hazardous waste impoundment to a desired degree at a first station thereon without contaminating the ambient atmosphere is carried out by an apparatus (U) that includes a power operated vehicle (V) that movably supports ... | 07/04/1989 |
| 4842448 | Method of removing contaminants from contaminated soil in situ A method of removing contaminants from a contaminated soil area in situ comprises the steps of placing a barrier in engagement with the exposed surface of the contaminated soil area, sealing the barrier around the periphery of the contaminated soil area a... | 06/27/1989 |
