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Patent

Method for remediation of groundwater contamination

10 Feb 1994-
TL;DR: In this paper, a method for remediating a hydrocarbon-contaminated region of a subterranean body of groundwater to destroy or reduce the initial concentration levels of hydrocarbon contaminants is presented.
Abstract: A method for remediating a hydrocarbon-contaminated region of a subterranean body of groundwater (10) to destroy or reduce the initial concentration levels of hydrocarbon contaminants. A plurality of mutually spaced wells (12, 14, 16, 18) are provided which intersect the groundwater (10) region. A treating flow of acetic acid is provided from one or more of the wells into the groundwater region, to establish acidic conditions. A turbulent flow of an aqueous solution of ferrous ion into the groundwater (10) region is generated for mixing with the acidified groundwater (10), thereby providing a catalyst for disassociation of hydrogen peroxide. A treating flow of hydrogen peroxide solution from one or more of the wells (12, 14, 16, 18) into the groundwater region is then provided, so that the hydrogen peroxide may undergo a Fenton-like reaction in the presence of the acidic conditions and ferrous ion to generate hydroxyl free radicals for oxidizing the contaminants. An apparatus system for practising the method is also disclosed.
Citations
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Patent
28 Jan 2015
TL;DR: In this paper, the authors proposed a method for repairing soil polluted by heavy metals by using chemical oxidation enhanced chemical leaching, and the method comprises the following steps of (1) leaching with an oxidizing agent: performing vibration leaching on polluted soil by using an oxidising agent solution, centrifuging and filtering to remove a leaching solution.
Abstract: The invention relates to a method for repairing soil polluted by heavy metals by using chemical oxidation enhanced chemical leaching, and aims at providing a repairing method of chemical oxidation enhanced chemical leaching adopted to increase removal rate of a leaching agent by eluting organic combined states of the heavy metals. The method comprises the following steps of (1) leaching with an oxidizing agent: performing vibration leaching on polluted soil by using an oxidizing agent solution, centrifuging and filtering to remove a leaching solution; and (2) leaching with a Na2EDTA aqueous solution: adding the Na2EDTA aqueous solution in the polluted soil leached by the oxidizing agent to carry out the vibration leaching, centrifuging and filtering to remove the leaching solution.

4 citations

References
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Patent
07 Nov 1985
TL;DR: In this paper, a process to oxidize a contaminant in a permeable underground formation by introducing an aqueous treating solution into the formation which solution contains hydrogen peroxide and a compound to control the mobility of the solution by increasing the viscosity, the density, or modifying the interfacial properties of the aqous solution within the formation.
Abstract: The present invention is a process to oxidize a contaminant in a permeable subterranean formation by introducing an aqueous treating solution into the formation which solution contains hydrogen peroxide and a compound to control the mobility of the aqueous solution by increasing the viscosity, the density, or modifying the interfacial properties of the aqueous solution within the formation The aqueous treating solution may also contain stabilizers for the hydrogen peroxide, free radical initiators, or free radical traps Optionally, the formation may be pretreated to modify the permeability of the formation, to deactivate or remove hydrogen peroxide decomposition catalyst or to uniformly distribute free radical initiators therein

74 citations

Patent
10 Jun 1977
TL;DR: In this article, an apparatus for the chemical decontamination of layers of earth and/or water contaminated with organic materials comprising the following block units: Device for withdrawal of water from a water pressure line which water is to be treated and returned into the layers of the earth, mixing device for the preparation of a mixture of water and at least one strong, chemical oxidizing agent and or bactericide, degassing device for removal of excess gas from the mixture, a distribution device for distributing the mixture to several feed lines, and several mobile sprinkling or feeding lines with drain pipes
Abstract: There is provided an apparatus for the chemical decontamination of layers of earth and/or water contaminated with organic materials comprising the following block units: Device for withdrawal of water from a water pressure line which water is to be treated and returned into the layers of earth, A mixing device for the preparation of a mixture of water and at least one strong, chemical oxidizing agent and/or bactericide, A degassing device for removal of excess gas from the mixture, A distribution device for distributing the mixture to several feed lines, and Several mobile sprinkling and/or feeding lines with drain pipes to feed the aqueous mixture to and/or the layers of earth whereby the drain pipes are at most lowered to the still water level in the water bearing layers of ground. There is also described a method of using the apparatus.

49 citations

Patent
01 Sep 1988
TL;DR: In this article, a method and apparatus for decontaminating soil which has been contaminated with hazardous hydrocarbons is presented, which includes a blending or scrubbing unit for mixing the contaminated soil with water and a suitable surfactant to form a slurry; screening apparatus operably interconnected with the blending unit for removing from the slurry particles larger than a predetermined size to form small particle slurry, a reactor unit operably connected with the screening apparatus for reacting the silt with ozone to form an ozone enriched silt, an ultraviolet radiation generator for irradiating the ozone enriched
Abstract: A method and apparatus for decontaminating soil which has been contaminated with hazardous hydrocarbons. The apparatus includes a blending or scrubbing unit for mixing the contaminated soil with water and a suitable surfactant to form a slurry; screening apparatus operably interconnected with the blending unit for removing from the slurry particles larger than a predetermined size to form a small particle slurry; a reactor unit operably interconnected with the screening apparatus for reacting the slurry with ozone to form an ozone enriched slurry; an ultraviolet radiation generator for irradiating the ozone enriched slurry with ultraviolet radiation; a static mixer operably interconnected with the reactor unit for mixing a floculating material with the slurry to form a floculated slurry; and a belt-forming press for receiving the floculated material from the static mixer and for forming the floculated slurry into contamination free blocks.

33 citations