Chromium Patents (Class 210/913)
  • Patent number: 8679350
    Abstract: A process for treating acidic mine drainage water to remove heavy metal ions is described in which acidic mine drainage water is contacted with direct process residue gel.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: March 25, 2014
    Assignee: Dow Corning Corporation
    Inventor: David Crosby
  • Patent number: 8673152
    Abstract: Wastewater treatment systems, methods and apparatus for polishing a wastewater stream comprising a plurality of contaminants are provided. One system includes a vessel containing a plurality of natural media filtration agents selected to remove selected ones of the plurality of contaminants from the wastewater stream. In one embodiment, the vessel includes a bed of bauxite residue and at least one other natural media filtration agent. In another embodiment, the vessel includes a bed of compost and at least one other natural media filtration agent. The vessel includes a wastewater inlet that is in fluid communication with one or more of the natural media filtration agents. The vessel includes a wastewater outlet that is in fluid communication with one or more of the natural media filtration agents.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: March 18, 2014
    Assignees: Alcoa Inc., Corporate Environmental Solutions LLC
    Inventors: John R. Smith, Jaw K. Fu, Rajat Ghosh, Kevin Kitzman, Jonell Kerkhoff, Robert C. Horger, Dennis L. Fulmer, Aniruddha Bhattacharyya, Andrew C. Middleton, Robin L. Weightman
  • Patent number: 8404210
    Abstract: An iron composition having a plurality of elemental components is disclosed. The major component is an iron component of at least about 68% to about 92% iron by weight. Other components by weight include manganese; cerium; carbon; phosphorous; sulfur; aluminum; silicon; chromium; copper; and zinc. Combined with layers of sand, brick chips and/or charcoal, the iron composition can be used to create a water filter for filtering inorganic arsenic species and soluble metal ions out of water. To enhance hydrous ferric oxide complexation and precipitation, the iron composition may be treated with food grade acids or a water mixture.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: March 26, 2013
    Assignee: George Mason Research Foundation, Inc.
    Inventor: Abul Hussam
  • Patent number: 8372283
    Abstract: A sulfurous acid/alkalinization pre-treatment method for wastewaters to condition and remove a number of chemicals/pharmaceuticals and heavy metals before the recovered treated influent undergoes further biological reduction via anaerobic and aerobic digestion.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: February 12, 2013
    Assignee: Earth Renaissance Technologies, LLC
    Inventor: Marcus G. Theodore
  • Patent number: 8357303
    Abstract: A method for removing a metal from a metal-containing solution comprising contacting the metal-containing solution with a metal-removing composition comprising a substrate, an organic ion, and a metal binding agent, and recovering a solution having a lowered metal concentration when compared to the metal-containing solution.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: January 22, 2013
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Alfredo M. Angeles-Boza, Charles R. Landis, William W. Shumway
  • Patent number: 8241505
    Abstract: The invention includes ion exchange resins, methods of making ion exchange resins and their use in the removal of perchlorate from water. In one embodiment, the invention comprises a method for removing perchlorate from a water source by contacting the water with an ion exchange resin, wherein the ion exchange resin comprises particles of a crosslinked copolymer comprising: an interpenetrating polymer network (IPN) of at least two polymer components each having a styrenic content greater than 50 molar percent, and a quaternary ammonium functionality.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: August 14, 2012
    Assignee: Dow Global Technologies LLC
    Inventor: Daryl J. Gisch
  • Patent number: 8192705
    Abstract: Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite processing wastes with sulfide ion; and, contacting the chromite processing wastes with ferrous sulfide.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: June 5, 2012
    Assignee: Redox Solutions, LLC
    Inventors: Steven A. Chisick, Timothy Clark Heffernan, Thomas P. McCullough, Gary Joel Meyer
  • Patent number: 8168070
    Abstract: The invention includes ion exchange resins and their use in the removal of chromium from water. In one embodiment, the invention comprises a method for removing chromium from a water source by contacting the water with an ion exchange resin, wherein the ion exchange resin comprises particles of a crosslinked copolymer comprising: an interpenetrating polymer network (IPN) of at least two polymer components each having a styrenic content greater than 50 molar percent, and a quaternary ammonium functionality.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: May 1, 2012
    Assignee: Dow Global Technologies LLC
    Inventors: Daryl J. Gisch, Jing Jin
  • Patent number: 7897049
    Abstract: Systems and associated methods for treating contaminant-containing wastewater are provided. The systems generally include a reducing zone for reducing the oxidation-reduction potential of the water and a clean-up zone comprising zero valent iron for removing at least a portion of the contaminant from the contaminant-containing water. The systems are operable to remove one or more contaminants from the contaminant-containing water and are operable for extended durations without clogging due to the formation of iron hydroxides.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: March 1, 2011
    Assignee: Alcoa Inc.
    Inventors: Rajat S. Ghosh, Dennis Fulmer, Kevin Kitzman, John Smith
  • Patent number: 7892436
    Abstract: Compositions and methods and for contaminants from water are provided. The compositions comprise ferric hydroxide and ferric oxyhydride coated substrates for use in removing the contaminant from the water. Contacting water bearing the contaminant with the substrates can substantially reduce contaminant levels therein. Methods of oxidizing the contaminants in water to facilitate their removal by the ferric hydroxide and ferric oxyhydride coated substrates are also provided. The contaminants include, but are not limited to, arsenic, selenium, uranium, lead, cadmium, nickel, copper, zinc, chromium and vanadium, their oxides and soluble salts thereof.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: February 22, 2011
    Assignee: The Regents of the University of California
    Inventor: Ashok Jagannth Gadgil
  • Patent number: 7807058
    Abstract: Toxic substances such as heavy metals are extracted from a medium using a sorbent composition. The sorbent composition is derived by sulfidation of red mud, which contains hydrated ferric oxides derived from the Bayer processing of bauxite ores. Exemplary sulfidizing compounds are H2S, Na2S, K2S, (NH4)2S, and CaSx. The sulfur content typically is from about 0.2 to about 10% above the residual sulfur in the red mud. Sulfidized red mud is an improved sorbent compared to red mud for most of the heavy metals tested (Hg, Cr, Pb, Cu, Zn, Cd, Se, Th, and U). Unlike red mud, sulfidized red mud does not leach naturally contained metals. Sulfidized red mud also prevents leaching of metals when mixed with red mud. Mixtures of sulfidized red mud and red mud are more effective for sorbing other ions, such as As, Co, Mn, and Sr, than sulfidized red mud alone.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: October 5, 2010
    Assignee: J.I. Enterprises, Inc.
    Inventor: Joseph Iannicelli
  • Patent number: 7799232
    Abstract: A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: September 21, 2010
    Assignee: Mitsubishi Materials Corporation
    Inventors: Hiroshi Hayashi, Hitoshi Takeuchi, Hajime Negishi, Shigeyuki Tsuzaki, Yoshio Aikawa, Ayako Mimoto, Shintaro Nakaya
  • Patent number: 7754071
    Abstract: The disclosed invention is a fixed bed ion exchange water purification system. It employs a combination of electronically controlled process steps and specific systems configurations to duplicate the effects of moving resin beds from one operating position to another as is required in moving bed ion exchange water purification systems. The invention combines features of single fixed bed ion exchange systems with those of a moving bed system. The invention applies to the treatment of water having typical industrial and drinking water concentrations of various ions.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: July 13, 2010
    Assignee: Envirogen Technologies, Inc.
    Inventors: Peter L. Jensen, Gerald A. Guter, Dan Ziol
  • Patent number: 7736519
    Abstract: The invention relates to a method for processing an aqueous effluent (E) containing in solution at least one type of metal (M) nitrite or nitrate whose oxide is stable in an aqueous medium consisting (I) in introducing cations NH4+ in aqueous solution, generally in the form of an aqueous ammonia solution, into the aqueous effluent and, subsequently (II) in processing the obtainable medium at a temperature ranging from 100 to 700° C. and a pressure of 1-50 MPa (i.e. from 10 to 500 bar), thereby converting the metal (M) nitrite or nitrate into metal (M) oxide, nitrogen and water.
    Type: Grant
    Filed: June 17, 2005
    Date of Patent: June 15, 2010
    Assignee: Centre National de la Recherge Scientifique (C.N.R.S.)
    Inventors: François Cansell, Marie Gaudre, Jean-Michel Tauzia
  • Patent number: 7670576
    Abstract: Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer; permitting the chromite processing wastes to react with the oxygen scavenger or chemical reducer; contacting the chromite processing wastes with ferrous ion; contacting the chromite processing wastes with sulfide ion; and, contacting the chromite processing wastes with ferrous sulfide.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: March 2, 2010
    Assignee: Redox Solutions, LLC
    Inventors: Steven A. Chisick, Timothy Clark Heffernan, Thomas P. McCullough, Gary Joel Meyer
  • Patent number: 7635434
    Abstract: Solid and liquid concrete waste is collected from a construction site and safely off-loaded at a treatment site. Solid waste is separated and sent to a crusher to be made into road bed aggregate. Liquid waste is put in a first tank to settle the solids, then moved to a second tank to settle remaining fine solids, and moved to a third tank coupled to a circulation pump with CO2 gas injection to lower the pH. The liquid in the third tank is then filtered before discharging for recycle, irrigation or dust control. A precipitate agent is preferable added to the liquid in the third tank to remove heavy metals and the precipitate is periodically backwashed from the filter into the first tank. The sludge created in the settling and filtering process is periodically dewatered in the first tank and mixed with the solid concrete waste sent to the crusher.
    Type: Grant
    Filed: May 13, 2008
    Date of Patent: December 22, 2009
    Assignee: Concrete Washout Systems, Inc.
    Inventors: Kevin Mickelson, Roger Engelsgaard
  • Patent number: 7419605
    Abstract: A method for removing metal contaminants from water uses lignin derivatives, such as lignosulfonates and kraft lignin, a coagulant, such as a metal salt, and a pH-increasing composition. The lignin derivative is dispersed in the contaminated water, the coagulant is added and the pH is adjusted as required to cause flocculation. A sludge is formed that contains the metals and that is separated from the treated water by filtration. Related methods are used to reduce the leachable metal content of contaminated soils. The invention also provides a composition for stabilizing the metal contaminants in soil, comprising lignin derivatives, a coagulant and a composition for increasing the pH. The mixture is blended with the contaminated soil, reducing its leachable metal content.
    Type: Grant
    Filed: January 19, 2006
    Date of Patent: September 2, 2008
    Assignee: Noram Engineering and Constructors Ltd.
    Inventor: J. Ming Zhuang
  • Patent number: 7404939
    Abstract: A sorbent composition comprising a vanadium compound and a TiO2 support material is disclosed. Methods of making and using the composition to remove heavy metals or heavy metal containing compounds from a fluid stream are also provided. Such methods are particularly useful in the removal of mercury and mercury compounds from flue gas streams produced from the combustion of hydrocarbon-containing materials such as coal and petroleum fuels.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: July 29, 2008
    Assignee: ConocoPhillips Company
    Inventors: Joseph B. Cross, Glenn W. Dodwell, Marvin M. Johnson, Edward L. Sughrue, II, Jianhua Yao
  • Patent number: 7390416
    Abstract: An improved method to remove metals, including molybdenum, from industrial wastewater, by chemical precipitation of the metals, followed by settling and dewatering of the precipitate.
    Type: Grant
    Filed: January 25, 2005
    Date of Patent: June 24, 2008
    Assignee: American Airlines, Inc.
    Inventors: Kenneth F. Ede, Kerry C. Thorson
  • Patent number: 7361281
    Abstract: The disclosed invention is a fixed bed ion exchange water purification system. It employs a combination of electronically controlled process steps and specific systems configurations to duplicate the effects of moving resin beds from one operating position to another as is required in moving bed ion exchange water purification systems. The invention combines features of single fixed bed ion exchange systems with those of a moving bed system. The invention applies to the treatment of water having typical industrial and drinking water concentrations of various ions.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: April 22, 2008
    Assignee: Basin Water, Inc.
    Inventors: Peter L. Jensen, Gerald A. Guter, Dan Ziol
  • Patent number: 7329357
    Abstract: A method for removing fluorine from wastewater includes the steps of: adding a fluorine-reactive agent, that comprises a water-soluble sodium compound and a water-soluble aluminum compound, into the wastewater so as to form sodium ions and aluminum ions in the wastewater and so as to precipitate sodium aluminum fluoride by reaction of the sodium ions and the aluminum ions with fluorine ions in the wastewater; and removing the precipitate of sodium aluminum fluoride from the wastewater.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: February 12, 2008
    Inventor: Ming-Hui Liao
  • Patent number: 7309437
    Abstract: The present invention relates to compositions and methods for the removal of toxic metals or radionuclides from source materials. Toxic metals may be removed from source materials using a clay, such as attapulgite or highly cationic bentonite, and chitin or chitosan. Toxic metals may also be removed using volcanic ash alone or in combination with chitin or chitosan. Radionuclides may be removed using volcanic ash alone or in combination with chitin or chitosan.
    Type: Grant
    Filed: January 6, 2005
    Date of Patent: December 18, 2007
    Assignee: The Texas A&M University System
    Inventors: Raul G. Cuero, David S. McKay
  • Patent number: 7288170
    Abstract: A process is intended to allow simple and particularly reliable electrolyte generation and conditioning from metal-containing used electrolytes and/or used process solutions and/or pulverulent metal wastes. For this purpose, waste products containing metal ions from metal surface treatment processes are to be treated by producing and/or using a metal ion mixed solution, replacing anions contained in the metal ion mixed solution with anions selected for an intended use selected and selectively removing metal ions which are categorized as unsuitable for the intended use selected from the metal ion mixed solution prepared in this way.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: October 30, 2007
    Assignee: Siemens Aktiengesellschaft
    Inventors: Jens Birkner, Ursus Krüger, Daniel Körtvelyessy, Ralph Reiche, Jan Steinbach, Marc de Vogelaere
  • Patent number: 7285222
    Abstract: A method for recycling sludge during waste-water treatment firstly utilizes a process of chemical coagulation to produce sludge rich in copper ions. The sludge is then leached in a sulfuric acid storage tank with sulfuric acid of concentration 1-2N, whereby a extractive solution with copper enrichment 18-39 g/L and residues can be obtained. The extractive solution is then processed in a refrigeration crystallization tank to form copper sulfate crystals. Further, the residues produced are added into the coagulation tank as a coagulant in the process of chemical coagulation for wastewater treatment, thereby achieving a goal of zero sludge production.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: October 23, 2007
    Assignee: National Cheng Kung University
    Inventors: Hung-Yuan Hsiao, Min-Shing Tsai, Li-Hsing Shih, Hung-Ta Chen, Yeu-Juin Tuan
  • Patent number: 7273557
    Abstract: The present invention relates to the development of an improved methodology for adsorption and subsequent reduction of hexavalent chromium aimed at the total removal of hexavalent chromium in water, which comprises, reacting dichromate solutions with natural ferrous-saponite clays at temperature 50 to 200° C. for the period of 1 to 3.0 hours.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: September 25, 2007
    Assignee: Council of Scientific and Industrial Research
    Inventors: Gopalakrishnarao Parthasarathy, Bojja Sreedhar, Boyapati Manoranjan Choudhary
  • Patent number: 7267777
    Abstract: Method for removal of heavy metal ions from aqueous wastes, which are produced during electroplating and other industrial processes. The method comprises a precipitation process that is conducted in a magnetic field.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: September 11, 2007
    Assignee: Veracon Metal Ltd.
    Inventors: Pavel Koren, Igal Raz, Robert Asimov, Rami Noach, Irena Trounkovsky
  • Patent number: 7255793
    Abstract: A two-step chemical precipitation process involving hydroxide precipitation and sulfide precipitation combined with “field separation ” technology such as magnetic separation, dissolved air flotation, vortex separation, or expanded plastics flotation, effectively removes chelated and non-chelated heavy metal precipitates and other fine particles from water. In the first-step, the non-chelated heavy metals are precipitated as hydroxides and removed from the water by a conventional liquid/solids separator such as an inclined plate clarifier to remove a large percentage of the dissolved heavy metals. The cleaned water is then treated in a second precipitation step to remove the residual heavy metals to meet discharge limits. In the second precipitation step, any metal precipitant more effective than hydroxide for metal precipitation can be used.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: August 14, 2007
    Inventor: Steven L. Cort
  • Patent number: 7250067
    Abstract: The present invention relates to a product for, and a method of, treating gases, fumes and vapors with fragments of crustacean shell so as to extract one or more components/pollutants from the gases.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: July 31, 2007
    Assignee: Carafiltration Limited
    Inventor: Ashley John Wilson
  • Patent number: 7244359
    Abstract: A process and medium for decontamination of water containing anionic species including arsenic and chromium, wherein compounds comprising divalent and trivalent metal oxides and sulfides are used to form surface complexes with contaminants under pH conditions within the range of potable water. In one embodiment natural and synthetic spinels and spinel-like materials are used as the sorbent substance.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: July 17, 2007
    Assignee: Sandia Corporation
    Inventors: David M. Teter, Patrick V. Brady, James L. Krumhansl
  • Patent number: 7169309
    Abstract: The invention relates to a particular polymer which is derived from a copolymer polysaccharide formed by a main chain comprising similar or different anhydrohexose units and branches including at least one neutral or anionic anhydropentose and/or anhydrohexose unit. Moreover, the invention relates to the use of said polymer in the treatment of aqueous media, in particular the treatment of aqueous effluents containing heavy metals, the treatment of waste water, drinking water and for sludge conditioning. Said derivative polymer comprises one or more units bearing an oxime function at least at position C2.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: January 30, 2007
    Assignee: Rhodia Chimie
    Inventors: Etienne Fleury, Cécile Bonnet-Gonnet, Yvette Pescher
  • Patent number: 7166228
    Abstract: A method for treating a subsurface formation with a ferrous compound, to reduce a contaminant therein, involves introducing into the subsurface formation a ferrous compound in combination with sodium hydrosulfite in an amount sufficient to substantially prevent precipitation, during the introducing, of a major portion of the ferrous compound. The method was found to be useful in the reduction of hexavalent chromium to trivalent chromium at a Superfund site.
    Type: Grant
    Filed: October 14, 2004
    Date of Patent: January 23, 2007
    Assignee: U.S. Environmental Protection Agency
    Inventors: Ralph D. Ludwig, Chunming Su
  • Patent number: 7160526
    Abstract: A chemical process for detoxifying spent CCA (copper, chrome, arsenic)—treated wood, from which CCA and detoxified wood are recovered for recycling comprising the steps of (a) treating CCA-treated wood in the presence of a liquefying reagent such as an organic solvent at 100–250° C. with or without ferrous ions to form liquefied CCA-treated wood (b) adding water or an aqueous solution of an organic solvent to the liquefied CCA-treated wood with stirring to obtain an aqueous solution of liquefied CCA-treated wood (c) adding complexing or precipitating agents, such as phosphoric acid or calcium hydroxide to the aqueous solution of step (b) thereby precipitating insoluble heavy metal complexes or precipitates and forming a solution of detoxified CCA-treated wood (d) separating said heavy metal complexes or precipitates from the solution of detoxified liquefied CCA-treated wood and (e) isolating chromated copper arsenate from said heavy metal complex or precipitate.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: January 9, 2007
    Inventors: Lin Lianzhen, Chung-Yun Hse, Todd Finley Shupe
  • Patent number: 7138063
    Abstract: An improved water decontamination process comprising contacting water containing anionic contaminants with an enhanced coagulant to form an enhanced floc, which more efficiently binds anionic species (e.g., arsenate, arsenite, chromate, fluoride, selenate, and borate, and combinations thereof) predominantly through the formation of surface complexes. The enhanced coagulant comprises a trivalent metal cation coagulant (e.g., ferric chloride or aluminum sulfate) mixed with a divalent metal cation modifier (e.g., copper sulfate or zinc sulfate).
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: November 21, 2006
    Assignee: Sandia Corporation
    Inventors: David M. Teter, Patrick V. Brady, James L. Krumhansl, Nadim R. Khandaker
  • Patent number: 7138059
    Abstract: A method for in situ bioremediation of contaminants in the environment is described. The method includes adding an electron donor to ground water in an amount sufficient for a microbe in the ground water to use the electron donor for reducing the contaminant into an innocuous derivative thereof. Illustratively, the electron donor contains about 0.1 to 75% by weight of chitin, such as crustacean shell, partially deproteinized crustacean shell, ground mushrooms, or a fungal fermentation broth. The chitinous electron donor can be added to the ground water as a particulate solid or aqueous slurry.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: November 21, 2006
    Inventors: Kent S. Sorenson, Jr., Donovan N. Smith, III, Wayne H. Wilke
  • Patent number: 7105087
    Abstract: Systems and methods are provided for the removal and disposal of chromium form an aqueous medium. The systems and methods include the removal of chromium from a source by contact with either natural or synthetic zeolite that has been modified with a ferrous ion or other like substance. The spent zeolite is disposed of and replaced with freshly modified zeolite. In some cases the systems and methods are performed under de-oxidizing conditions.
    Type: Grant
    Filed: September 17, 2003
    Date of Patent: September 12, 2006
    Assignee: WRT International LLC
    Inventor: John E. Litz
  • Patent number: 7083732
    Abstract: The invention is related to a method and an installation for removal of metal cations contained in a liquid, in which said liquid is brought into contact at a temperature greater than or equal to 60° C. with a chelating ion exchange resin formed from a polyazacycloalkane grafted on a solid support, said resin having been conditioned, previously to said contacting, at a pH of 4 to 6.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: August 1, 2006
    Assignees: Commissariat a l'Energie Atomique, Centre National de la Recherche Scientifique
    Inventors: Hervé Chollet, Jean-Louis Babou, Frédéric Barbette, Roger Guilard
  • Patent number: 7074336
    Abstract: A process and medium for decontamination of water containing anionic species including arsenic and chromium, wherein compounds comprising divalent and trivalent metal oxides and sulfides are used to form surface complexes with contaminants under pH conditions within the range of potable water. In one embodiment natural and synthetic spinels and spinel-like materials are used as the sorbent substance.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: July 11, 2006
    Assignee: Sandia Corporation
    Inventors: David M. Teter, Patrick V. Brady, James L. Krumhansl
  • Patent number: 7041222
    Abstract: A process for the selective removal of toxic heavy metals from a flowing stream of water involves causing the stream to flow through a stationary bed of particulate polymer having amine functional groups, and injecting into the stream, adjacent the upstream extremity of the bed, a substantially continuous flow of carbon disulfide.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: May 9, 2006
    Inventor: Norman B. Rainer
  • Patent number: 7029202
    Abstract: A method for removing metal contaminants from water uses lignin derivatives, such as lignosulfonates and kraft lignin, a coagulant, such as a metal salt, and a pH-increasing composition. The lignin derivative is dispersed in the contaminated water, the coagulant is added and the pH is adjusted as required to cause flocculation. A sludge is formed that contains the metals and that is separated from the treated water by filtration. Related methods are used to reduce the leachable metal content of contaminated soils. The invention also provides a composition for stabilizing the metal contaminants in soil, comprising lignin derivatives, a coagulant and a composition for increasing the pH. The mixture is blended with the contaminated soil, reducing its leachable metal content.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: April 18, 2006
    Inventor: J. Ming Zhuang
  • Patent number: 7011756
    Abstract: A method for treating (in situ) large bodies of water contaminated with heavy metals and having varying density stratas to immobilize the contaminant metals is disclosed. The method, or process for (in situ) immobilization of metals is focused on treating large bodies of water having metals therein that are also adjacent a border of soil or earthen materials in an attempt to immobilize the metals from penetrating through the soil. The method is also able to treat the soil water boundary within the pit lake to provide additional immobilization. The pit lakes can include open pit lakes, subterranean mine lakes, flowing streams and the like. The method is also able to treat an abandoned mine prior to the filling of the mine with water. Initially, the density mean of the body of water is determined, which is densest typical at regions at or approaching 4 degrees C.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: March 14, 2006
    Inventor: Joseph G. Harrington
  • Patent number: 6942807
    Abstract: A water filtration device (3) and method which removes heavy metals and organic compounds from raw water is provided.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: September 13, 2005
    Assignee: Trustees of Stevens Institute of Technology
    Inventors: Xiaoguang Meng, George P. Korfiatis
  • Patent number: 6923914
    Abstract: Methods and apparatus are disclosed for remediating metal contaminants using hydrocarbons which stimulate the growth of hydrocarbon-utilizing bacteria. The metal contaminants may include heavy metals such as arsenic, antimony, beryllium, cadmium, chromium, copper, lead, mercury, iron, manganese, magnesium, radium, nickel, selenium, silver, thallium and zinc. The hydrocarbon may include alkanes, alkenes, Aalkynes, poly(alkene)s, poly(alkyne)s, aromatic hydrocarbons, aromatic hydrocarbon polymers and aliphatic hydrocarbons. Butane is a particularly suitable hydrocarbon which stimulates the growth of butane-utilizing bacteria. Remediation may occur in-situ or ex-situ, and may occur under aerobic, anaerobic or dual aerobic/anaerobic conditions. Examples of applications include the remediation of heavy metals, the remediation of arsenic impacted surface water, groundwater and/or soil, the remediation of acid mine drainage, and the treatment of spent metal plating solutions.
    Type: Grant
    Filed: July 26, 2002
    Date of Patent: August 2, 2005
    Assignee: Global Biosciences, Inc.
    Inventor: Felix Anthony Perriello
  • Patent number: 6896817
    Abstract: A product and method for the removal of pollutant heavy metals from aqueous solutions which precludes the end user from storing, handling, feeding and controlling hazardous soluble sulfide materials. The product is a slurry which includes a mixture of a liquid medium and an essentially insoluble salt wherein the salt is the reaction product of heavy metal ions, preferably selected from Mn++ ions, Fe++ ions, and Fe+++ ions, and sulfide ions derived from soluble sulfide sources such as sodium sulfide, hydrogen sulfide, and sodium hydrosulfide. Addition of the subject slurry to a wastewater stream will effect the precipitation of heavy metals with lesser equilibrium sulfide ion concentrations than that of the essentially insoluble salt. Solids collected by this method may be returned to subsequent wastewater streams for additional removal of heavy metals by any excess heavy metal sulfide salt.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: May 24, 2005
    Inventor: Gregory S. Bowers
  • Patent number: 6896815
    Abstract: A two-step chemical precipitation process involving hydroxide precipitation and sulfide precipitation combined with “field separation” technology such as magnetic separation, dissolved air flotation, vortex separation or expanded plastics flotation, effectively removes chelated and non-chelated heavy metal precipitates and other fine particles from water. In the first-step, the non-chelated heavy metals are precipitated as hydroxides and removed from the water by a conventional liquid/solids separator such as an inclined plate clarifier to remove a large percentage of the dissolved heavy metals. The cleaned water is then treated in a second precipitation step to remove the residual heavy metals to meet discharge limits. In the second precipitation step, any metal precipitant more effective than hydroxide for metal precipitation can be used.
    Type: Grant
    Filed: May 22, 2002
    Date of Patent: May 24, 2005
    Inventor: Steven L. Cort
  • Patent number: 6869537
    Abstract: A fiber capable of forming a metal chelate and a process for producing the same are disclosed, wherein the fiber is characterized in that at least one metal chelate-forming compound selected from the group consisting of aminocarboxylic acid, aminocarboxylic acid, thiocarboxylic acid and phosphoric acid, which are reactive with a glycidyl group, is bonded to a molecule of a synthetic fiber through a crosslinkable compound having a reactive double bond and a glycidyl group in its molecule. The chelate-forming fiber is excellent in capturing harmful heavy metal ions and can be easily produced in a simple and safe way at a low cost.
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: March 22, 2005
    Assignees: Chubu Chelest Co., Ltd., Chelest Corporation
    Inventors: Nobuyoshi Nambu, Osamu Ito, Takao Doi
  • Patent number: 6855254
    Abstract: A metal waste recovery process for recovering useful material from a quantity of waste material. The waste material is a composition including oil, metals and organic materials. The first step of the process is to deposit the waste material into a slurry tank and to add water to the waste material to produce a mixable slurry. The slurry is then high energy mixed to evenly distribute the waste material throughout the slurry. The useful metal is then recovered from the slurry using a magnetic separator. The remaining waste material is transferred into an anaerobic reactor where the remaining waste material reacts with anaerobic organisms provided by bacteria in a sludge seed. The anaerobic reaction between the anaerobic organism and the organic materials of the waste material produces recoverable inorganic gases that are removed from the waste material slurry. The recovered inorganic gases are transferred to a storage vessel and compressed.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: February 15, 2005
    Assignee: Shalom Recycling Inc.
    Inventor: Riley N. Kinman
  • Patent number: 6846416
    Abstract: The invention relates to a process for treating a chromate waste liquid containing an organic acid component. This process includes (a) adding a chromium precipitation accelerating agent containing at least one of a calcium component and a magnesium component, to the chromate waste liquid; and (b) adjusting the chromate waste liquid to having a first pH of 9 or higher, thereby precipitating a chromium component from the chromate waste liquid and thereby reducing a concentration of a dissolved chromium component of the chromate waste liquid.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: January 25, 2005
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroaki Nasu, Wataru Matsutani
  • Patent number: 6843922
    Abstract: A bead is provided which comprises or consists essentially of activated carbon immobilized by crosslinked poly(carboxylic acid) binder, sodium silicate binder, or polyamine binder. The bead is effective to remove metal and other ionic contaminants from dilute aqueous solutions. A method of making metal-ion sorbing beads is provided, comprising combining activated carbon, and binder solution (preferably in a pin mixer where it is whipped), forming wet beads, and heating and drying the beads. The binder solution is preferably poly(acrylic acid) and glycerol dissolved in water and the wet beads formed from such binder solution are preferably heated and crosslinked in a convection oven.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: January 18, 2005
    Assignee: Ricura Technologies, LLC
    Inventors: Bobby L. Summers, Jr., Karen L. Bennett, Scott A. Foster
  • Patent number: 6833124
    Abstract: A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-chromate precipitate, and recovering the insoluble precipitating reagent-chromate precipitate. It may optionally include reacting the insoluble precipitating reagent-chromate precipitate with an acidic solution to form an insoluble precipitating reagent precipitate and a soluble hexavalent chromium compound, and recovering the soluble hexavalent chromium compound. The process may also include reacting the insoluble precipitating reagent precipitate with a solubilizing reagent to form the soluble non-toxic precipitating reagent.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: December 21, 2004
    Assignee: University of Dayton
    Inventors: Andrew Wells Phelps, Jeffrey Allen Sturgill, Joseph Thomas Swartzbaugh
  • Patent number: 6833123
    Abstract: A method for removing at least one of chromate and other oxy-metal ions from liquid solutions includes contacting the liquid solution with solid barium compounds as adsorbents so that the at least one of chromate and other oxy-metal ions in liquid solution are subject to an exchange reaction with the anion of solid barium compounds to produce products including at least one of solid barium chromate and oxy-metal barium compounds and are removed from the liquid solution by a liquid-solid separation operation. A method for stabilizing at least one of chromate and other oxy-metal ions that are present in liquid or sludge wastes includes mixing the liquid or sludge wastes with barium compounds in solid form, so that the at least one of chromate and oxy-metal ions are immobilized in a solidified body after curing of the mixture.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: December 21, 2004
    Assignee: Institute of Nuclear Energy Research
    Inventors: Ching-Tsuen Huang, Tzeng-Ming Liu, Tsye-Shing Lee, Wen-Chao Lai