Including Organic Agent Patents (Class 210/727)
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Patent number: 6123856Abstract: A sludge, preferably derived at least in part from a paper mill, pulp mill or deinking plant, and which contains at least secondary sludge or primary sludge comprising deinking waste, recycled paper waste or mechanical pulping waste, is flocculated by being mixed with a phenolic material and a polyalkylene oxide and is then subjected to dewatering.Type: GrantFiled: December 29, 1998Date of Patent: September 26, 2000Assignee: Ciba Specialty Chemicals Water Treatments LimitedInventors: Victor Kumpera, Stephen Robert Tremont
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Patent number: 6117333Abstract: A process is disclosed which involves removing hydrocarbons, arsenic and mercury from wastewater produced in oil and gas fields. An oxidant, ferric ions, and flocculent are sequentially added to the wastewater to form a removable sludge containing the arsenic, hydrocarbon, and mercury contaminants. The Oxidation-Reduction Potential of the wastewater is controlled by oxidant addition to allow the required arsenic oxidation to occur while maintaining the mercury in elemental form. The process requires relatively short residence times between chemical additions and provides for large wastewater throughputs. The cleaned wastewater is suitable for discharge to the environment.Type: GrantFiled: April 22, 1997Date of Patent: September 12, 2000Assignee: Union Oil Company of CaliforniaInventors: Theodore C. Frankiewicz, John Gerlach
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Patent number: 6110382Abstract: Automated process, conditioning and treatment apparatus and methods are disclosed that are particularly well adapted for closed loop systems using or producing aqueous effluence with varying amounts of suspended solids therein, the apparatus and methods directed to separation of the solids from the effluence and thus cleaning of the centrate. The apparatus includes a mass flow rate meter, liquid polymer injector and control means for receiving the monitored rate from the meter and performing analysis to optimize the rate of injection of liquid polymer. The injector is monitored to further optimize the injection rate.Type: GrantFiled: July 25, 1997Date of Patent: August 29, 2000Assignee: Ultra Fine, Inc.Inventors: Reginald A. Wiemers, Michael J. R. Costello, Alfred R. Simmons, Gerald L. Sealey
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Patent number: 6090293Abstract: In this process for reducing the quantity of water contained in pulps of nickel-bearing ores, the pulp is diluted with water, a dilute aqueous solution of a flocculant based on an acrylic acid copolymer is injected, the mixture is left to decant, then the underflow and overflow are separated.Type: GrantFiled: August 3, 1998Date of Patent: July 18, 2000Inventors: Jean-Louis Cardini, Jean Roger Paul Regnoult
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Patent number: 6083404Abstract: The present invention provides a new method for dewatering difficult sludges, such as autothermal thermophilic aerobic digestion sludges. The method incorporates a three-component treatment system. Initially, the difficult sludge is dosed with an inorganic coagulant and then the resulting sludge-inorganic mixture is dosed with a microparticle component. Lastly, the resulting mixture is dosed with a high molecular weight flocculant.Type: GrantFiled: September 18, 1998Date of Patent: July 4, 2000Assignee: Nalco Chemical CompanyInventors: Anthony G. Sommese, Jitendra Shah
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Patent number: 6071417Abstract: A method for removing water-soluble macromolecular compounds is characterized by addition of alkali polyphosphates to an aqueous solution containing residual amounts of cationic, anionic, or amphoteric water-soluble macromolecular compounds, formation of insoluble complexes of the alkali polyphosphate and the water-soluble macromolecular complexes, and separation of the resulting complexes from the aqueous solution. This method does not affect the quality or yield of other important components in the aqueous solution.Type: GrantFiled: November 14, 1997Date of Patent: June 6, 2000Assignee: Kurita Water Industries, Ltd.Inventor: Tsuneyasu Adachi
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Patent number: 6063291Abstract: Belt pressing or other pressure dewatering of a high solids mineral suspension is facilitated by flocculating the suspension by mixing into the suspension anionic flocculant having IV at least 5 dl/g and a minor amount of a cationic flocculant which generally has IV at least 4 dl/g. The flocculants are normally such that counterionic precipitation occurs.Type: GrantFiled: February 5, 1998Date of Patent: May 16, 2000Assignee: Ciba Specialty Chemicals Water Treatments LimitedInventors: Anthony Peter Allen, Philip McColl, George Thomas Staines
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Patent number: 6059978Abstract: Cationic polymers are added to wastewater containing colorants to form a cationic polymer/colorant complex. Anionic polymers are then added to the wastewater to produce a flocculent precipitate that is separated from the wastewater.Type: GrantFiled: May 6, 1998Date of Patent: May 9, 2000Assignee: Simco Holding CorporationInventors: Joseph A. Pacifici, Daniel G. Sims
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Patent number: 6048463Abstract: The present invention is directed to the clarification of red mud-containing liquors generated in the Bayer process for the recovery of alumina from bauxite ore with a combination of high molecular weight emulsion polymer and lower molecular weight emulsion polymers. The invention is also a method for the same purpose utilizing a methyl acrylate emulsion homopolymer.Type: GrantFiled: May 8, 1998Date of Patent: April 11, 2000Assignee: Nalco Chemical CompanyInventors: Radhakrishnan Selvarajan, Everett C. Phillips
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Patent number: 6042732Abstract: A method for dewatering coal tailings, clean coal products and mineral slurries with an effective coagulating amount of a combination of a cationic polymer and a starch. A preferred cationic polymer is poly(dimethylaminoethylacrylate methyl chloride quaternary salt) and preferred starches are unmodified.Type: GrantFiled: April 15, 1999Date of Patent: March 28, 2000Assignee: Nalco Chemical CompanyInventors: Jeffrey A. Jankowski, Calvin T. Tobison
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Patent number: 6039880Abstract: A method for dehydrating a waste hydrocarbon sludge, includes the steps of: (a) providing a waste hydrocarbon sludge in the form of an emulsion of water and oil having a water content greater than or equal to about 10% vol; (b) providing a solution of a clarifying agent in formation water; (c) mixing the waste hydrocarbon sludge with the solution so as to provide a sludge-water mixture having a ratio of water to hydrocarbon of at least about 1:1; (d) adding a demulsifier to the sludge-water mixture to provide a sludge-water-demulsifier mixture; (e) heating the sludge-water-demulsifier mixture to a sufficient temperature and holding for a time sufficient to provide a hydrocarbon phase having a water content of less than or equal to about 1% vol.Type: GrantFiled: February 24, 1998Date of Patent: March 21, 2000Assignee: Intevep, S.A.Inventor: Carmen Morataya
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Patent number: 6004434Abstract: A method of treating cleaning solvent used to clean mechanical parts. The method includes adding to the cleaning solvent a treating composition selected from the group of C.sub.5 -C.sub.14 alcohols, C.sub.2 -C.sub.8 dials, C.sub.10 -C.sub.14 polyols, and C.sub.4 -C.sub.14 glycol ethers, and mixtures thereof. A further embodiment includes the foregoing plus adding a clarifying agent from the group of aromatic, aliphatic and alkaryl sulfonic acids and sulfonic acid salts, esterified polyols, and alkyl phenol formaldehyde resins capped with alkoxy groups. The solvent is vaporized and condensed to effect recycling thereof without adding substituted quantities of treating composition to the solvent.Type: GrantFiled: July 7, 1994Date of Patent: December 21, 1999Assignee: Safety-Kleen Corp.Inventor: Esfandiar Kiany
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Patent number: 5993668Abstract: Metal ions and/or complexes of metal ions are removed from a solution by formation of an insoluble chelated complex of the metal ions and a polymeric precipitating agent. A two-step process of mixing the influent with the precipitating agent is used to induce rapid precipitation and obtain large, self-agglomerated precipitate without addition of flocculating agent and/or pH adjustment. In addition, parallel loops are employed to simultaneously discharge treated metal-free solution and effectively collect/remove the precipitate-containing sludge without interfering with each other. The metal capturing capacity of the polymeric precipitant is maximized by forcing the influent solution through layers of the collected precipitate and by recycling unsaturated metal-precipitant complexes in the processing loop.Type: GrantFiled: August 28, 1997Date of Patent: November 30, 1999Assignee: Fuji Hunt Photographic Chemicals, Inc.Inventor: Hailing Duan
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Patent number: 5979012Abstract: A mobile surface contaminant extracting and water recycling apparatus comprises a standard truck, pickup, trailer or other wheeled container that is modified by the addition of a clay-based flocculent powder wastewater treatment unit. Mounted in combination with the wheeled container and the wastewater treatment unit is a vacuum steam cleaning unit. Steam is sent from the cleaning unit and sprayed by pressure guns onto the contaminated surface of a parking lot or other surface to be cleaned. The surface contaminants become emulsified in water condensed from the steam, which contaminated water then is vacuumed up by cleaning wands and returned by hose to the steam cleaning unit on the truck bed. From the steam unit, the contaminated water is piped to the adjacent truck-mounted wastewater treatment unit. The water is churned in the latter unit in the presence clay-based powder. The resultant floc sludge is deposited on top of porous cloth on a draining tray or trays.Type: GrantFiled: December 16, 1997Date of Patent: November 9, 1999Assignee: Parker West International, L.L.C.Inventor: Gary Fritz
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Patent number: 5958248Abstract: A method and a system which enable simple and inexpensive removal of heavy metals from a heavy-metal-containing substance. In this method, a substance containing heavy metals and water are introduced into a mixing bath in proportions by weight of 1:3 to 1:6. A strong acid is added to the mixture, and the mixture is stirred while its pH is maintained at a pH lower than 4. As a result of stirring of the substance at a pH 4, heavy metals are extracted into the liquid as metal ions. The metal-ion-containing liquid is input to a heavy metal precipitation bath, and the pH of the liquid is increased to a pH higher than 10 by addition of alkali to the liquid. Gas bubbles of carbonic acid gas are input to the liquid from a lower portion of the heavy metal precipitation bath, and they are broken into a large quantity of small gas bubbles of carbonic acid gas by turbine blades. The large quantity of gas bubbles of carbonic acid are brought into contact with the metal-ion-containing liquid having a pH higher than 10.Type: GrantFiled: August 1, 1997Date of Patent: September 28, 1999Inventor: Yukimasa Satoh
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Patent number: 5954964Abstract: The present invention comprises a wastewater treatment process wherein the waste activated sludge is digested to produce treated biosolids which are then directed to a dewatering facility that removes water from the treated biosolids. Before or during the dewatering process, both a low molecular weight polymer and a high molecular weight polymer are added to the treated biosolids. The addition of the two polymers of different molecular weights results in the treated biosolids coagulating and then forming flocs of biosolids that effectively drives water from the flocs and renders the flocs more susceptible to an efficient and effective dewatering process.Type: GrantFiled: July 29, 1997Date of Patent: September 21, 1999Assignee: Kruger, Inc.Inventors: Bente Elise Nielsen, R. David Holbrook
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Patent number: 5948270Abstract: A method for reducing turbidity in laundry waste water comprising the steps of treating said water with effective amounts of a first polymer comprised of a dialkyl diallyl ammonium halide containing (meth)acrylic acid moieties and a second anionic, nonionic or cationic acrylamide polymer is disclosed.Type: GrantFiled: March 1, 1996Date of Patent: September 7, 1999Assignee: Calgon CorporationInventor: Denis E. Hassick
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Patent number: 5925256Abstract: The present invention concerns the treatment of an aqueous effluent and consists of ridding it of the iron which it contains, notably in the form of a complex. The method according to the invention consists of treating this effluent by successively a silicate, and a magnesium and aluminium hydroxycarbonate, then decanting and filtering. The method according to the invention is particularly useful in the treatment of photographic effluents.Type: GrantFiled: September 24, 1997Date of Patent: July 20, 1999Assignee: Eastman Kodak CompanyInventor: Philippe Strauel
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Patent number: 5922207Abstract: A process for filtering kaolin clay slurries in the presence of a filter aid which increases the percent solids in the filter cake, decreases the product solids in the waste filtrate, increases the rate of filtration, and yet does not interfere with redispersal of the filter cake after filtration. The process utilizes high molecular weight, highly anionic polyacrylic acid homopolymers or copolymers, or water soluble salts thereof, as filter aids for thickening and dewatering kaolin clay slurries. The flocculated clay may be redispersed after the separation process by normal means, such as the addition of low molecular weight anionic polymers with mixing.Type: GrantFiled: April 30, 1998Date of Patent: July 13, 1999Assignee: Engelhard CorporationInventors: Mitchell J. Willis, Sanjay Behl, Raymond H. Young
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Patent number: 5914040Abstract: The present invention relates to a process for the purification of a medium containing organic waste. The process according to the present invention is characterized in that the starting medium (or effluent) containing the organic waste is subjected to the following stages: (i) treatment with at least one oxidizing agent; (ii) treatment with at least one flocculating agent; (iii) treatment with at least one polyelectrolyte, and in that the effluent obtained on conclusion of all of these stages is subjected to a filtration stage (iv), whereby a filtration cake and a filtrate are obtained. The process according to the present invention is more particularly useful for the treatment of pig manure.Type: GrantFiled: October 14, 1997Date of Patent: June 22, 1999Assignee: Rhone-Poulenc ChimieInventors: Yvette Pescher, Jean-Paul Raes, Sylvain Danda, Bernard Castelas, Fran.cedilla.ois Rabatel, Jose Morales, Jean Bonfill
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Patent number: 5906750Abstract: A chemical method is provided for the dewatering of biological sludge that has been digested by a thermophilic digestion process. Five versions of the chemical sludge dewatering method are presented. The primary component in the five versions is a polyquaternary amine, preferably of the di-allyl di-methyl ammonium chloride (DADMAC) variety and from the epichlorohydrin di-methyl amine (epi-DMA) variety. By the first sludge dewatering method, the polyquaternary amine is added directly, along with a polyacrylamide, to the biological sludge. By the second sludge dewatering method, the polyquaternary amine and an anionic polyacrylamide are added separately. By the third sludge dewatering method, a quaternized polyacrylamide, having the polyquaternary amine as part of its polymer chain, is produced by copolymerization of acrylamide with monomers of polyquaternary amine quaternization and is added individually to the sludge.Type: GrantFiled: April 6, 1998Date of Patent: May 25, 1999Inventor: Richard Alan Haase
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Patent number: 5876608Abstract: The invention relates to a method of purifying contaminated degreasing liquids including (a) adding a collection polymer or polymer mixture forming two phases to the degreasing liquid; (b) mixing the collection polymer with the degreasing liquid; (c) separating the collection polymer and the degreasing liquid gravimetrically, whereby the collection polymer and the major part of the contaminants form a hydrophobic bottom phase and the degreasing agent forms a hydrophilic top phase; (d) removing the bottom phase; and (e) reusing the top phase directly or for further processing.Type: GrantFiled: June 27, 1996Date of Patent: March 2, 1999Assignee: Alfa Laval Separation ABInventor: Gunnar Strom
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Patent number: 5876609Abstract: The instant invention relates to a novel process for the hydrolysis of the by-products produced during the manufacture of methyldichlorosilanes comprising combining the by-products with an aqueous medium, optionally comprising a surfactant, at a pH range of at least about 7 and at a temperature of above about 0.degree. C. to produce a solid material in which copper and other metals are retained in a solid phase thereby resulting in a product with a high copper content.Type: GrantFiled: March 28, 1997Date of Patent: March 2, 1999Assignee: General Electric CompanyInventors: Michael Lee White, Sunita Singh Baghel, Luisito Alvarez Tolentino, Mark Kromer Barr, David Cheney DeMoulpied, William Lee Gately, Jan-Willem Goedmakers, Jeffrey David Hallen, Edward Francis Kennedy, Bang Mo Kim, Ray Walton Shade, Matthew David Butts
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Patent number: 5861100Abstract: The method of the invention is characterized by adding comprises adding an inorganic flocculant to waste water treated with activated sludge process, adjusting the waste water between pH 4.0 and 5.0, waste water in this state for at least 1 minute, adjusting the waste water between pH 5.5 and 9.0 and adding an anionic polymer flocculant to generate flocs and separating the flocs to obtain supernatant. According to the invention, flocs become large, especially since flocs grow by adsorbing fine particles during maturation. The clarity of the treated water is sharply improved, and the qualities of the treated water, such as COD and chromaticity are also improved. Moreover, the scale of sedimentation tank can be made compact due to the improvement in precipitatability of flocs by growing into large size.Type: GrantFiled: August 14, 1997Date of Patent: January 19, 1999Assignee: Ajinomoto Co., Inc.Inventor: Yoshimi Nagasaki
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Patent number: 5855793Abstract: The invention relates to the treatment of waste water containing a harmful ion such as a heavy metal ion or fluorine ion by the coagulating sedimentation method using an inorganic coagulant such as an iron compound or an aluminum compound. After separating treated water from the sediment (sludge) in which the harmful ion is incorporated in insoluble form, the pH of a mixture of the sediment and water is suitably adjusted to cause elution of the harmful ion from the sediment. Then the sediment is separated from the eluate and reused as an inorganic coagulant. By reusing the sediment in this manner, the waste water treatment is accomplished without producing a large quantity of sludge and the consumption of inorganic coagulant and auxiliary chemicals can be greatly reduced, while the concentration of the harmful ion in the treated water becomes sufficiently low.Type: GrantFiled: November 18, 1997Date of Patent: January 5, 1999Assignee: NEC CorporationInventors: Kenichi Ikeda, Yuichi Asai, Yuji Arai
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Patent number: 5846435Abstract: A chemical method is provided for the dewatering of biological sludge that has been digested by a thermophilic digestion process. Four versions of the chemical method are presented. The primary component in the four versions is a polyquaternary amine, preferably of the di-allyl di-methyl ammonium chloride (DADMAC) variety and from the epichlorohydrin di-methyl amine (epi-DMA) variety. By the first method, the polyquaternary amine is added directly, along with a cationic polyacrylamide, to the biological sludge. By the second method, the polyquaternary amine and an anionic polyacrylamide are added separately. By the third method, a quaternized polyacrylamide, having the polyquaternary amine as part of its polymer chain, is produced by copolymerization of acrylamide with monomers of polyquaternary amine quaternization and is added individually to the sludge. By the fourth method, the quaternized polyacrylamide from method three is added in concert with a cationic polyacrylamide to the sludge.Type: GrantFiled: September 26, 1996Date of Patent: December 8, 1998Inventor: Richard Alan Haase
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Patent number: 5846434Abstract: An in-situ groundwater remediation pump and treat technique effective for reclamation of aquifers that have been contaminated with a mixed, metal-containing waste, which promotes selective mobilization of metal oxide colloids with a cationic surfactant, preferably a quaternary alkylammonium surfactant, without significantly reducing formation permeability that often accompanies large-scale colloid dispersion, thus increasing the efficiency of the remediation effort by enhancing the capture of strongly sorbing contaminants associated with the oxide phases. The resulting suspension can be separated from the bulk solution with controlled pH adjustments to destabilize the oxide colloids, and a clear supernatant which results that can be recycled through the injection well without further waste treatment.Type: GrantFiled: February 28, 1997Date of Patent: December 8, 1998Assignee: University of Georgia Research FoundationInventors: John C. Seaman, Paul M. Bertch
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Patent number: 5846433Abstract: A suspension is dosed with a coagulant and then with a flocculant and is dewatered to form a thickened sludge or cake and separated liquor, and control of the dewatering performance is improved by adding the flocculant at a predetermined dosage, monitoring the charge in the separated liquor (or monitoring other dewatering parameter of the separated liquor or suspension) and adding coagulant at a dosage selected in response to the monitored charge or other parameter value in order to maintain the value substantially at a preselected optimum value.Type: GrantFiled: April 16, 1997Date of Patent: December 8, 1998Assignees: Allied Colloids Limited, AB CDMInventors: Jens Sorensen, John Rodney Field
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Patent number: 5846436Abstract: Tannin containing polymers, their method of production and methods of using as water treatment agents are disclosed. The polymers are aldehyde-free and comprise copolymers of tannin and a cationic monomer. Another embodiment comprises aldehyde-free polymers of tannin, cationic monomer and at least one monomer selected from the group consisting of an anionic monomer and a nonionic monomer.Type: GrantFiled: February 20, 1997Date of Patent: December 8, 1998Assignee: BetzDearborn Inc.Inventors: Jen-Chi Chen, Fu Chen, Gerald C. Walterick, Jr., Stephen R. Vasconcellos
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Patent number: 5811013Abstract: Disclosed is an oil separating method in which oil-contaminated water in a separation tank is mixed with air bubbles in a bubble-generating apparatus provided at the bottom of the separation tank to jet out said air-water mixture into the separation tank,wherein a surfactant and/or an antifoamer are(is) previously added to the oil-contaminated water.Type: GrantFiled: December 26, 1995Date of Patent: September 22, 1998Assignee: FSK Inc.Inventor: Hirotsugu Ito
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Patent number: 5807486Abstract: There is disclosed a portable assembly for treating hazardous waste water having a plurality of paired filter units having filter mediums and operated at high filter rates to minimize solids build up wherein solids are caused to be smashed and broken by shear forces and wherein chemicals are sequentially added to facilitate solids reduction, to oxidize organic compounds and to precipitate dissolved solids and wherein the process stream is subjected to ultraviolet light to reduce organic loading and downstream ultra filtration units to further reduce solids followed by reverse osmosis and/or ionization treatment.Type: GrantFiled: September 18, 1996Date of Patent: September 15, 1998Assignee: Joseph B. Busch, Sr. et al.Inventor: Joseph B. Busch, Jr.
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Patent number: 5800717Abstract: A sedimentation device for treating water and wastewater utilizing differential sedimentation and recirculation in an internal recirculation reactor with an upflow zone and a downflow zone within a settling tank. Inert particles are added to the internal recirculation reactor to increase the growth rate of forming flocs and increase the differential sedimentation of the flocs in the downflow zone.Type: GrantFiled: October 2, 1996Date of Patent: September 1, 1998Assignee: Microsep International CorporationInventors: Stephen R. Ramsay, Donald G. Nyberg
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Patent number: 5800718Abstract: A method of treating a spent dry film stripping and/or developing solution comprising the steps of adding about 0.01 to 15 grams of an aluminum source per liter of solution; adding about 0.05 to 25 grams of a metal precipitating agent per liter of solution; mixing the aluminum source, the metal precipitating agent and the solution with one another to form a mixture; adding an acid source to the mixture to lower the pH to less than about 6.5; and filtering the mixture to separate the metals and the photoresist from the remainder of the solution. The composition may also include 0 to 10 percent by weight of a dust-suppression agent, per liter of the solution, 0.1 to 10 grams of siliceous particulates per liter of spent stripper solution and/or an agent to enhance flocculation of the polymer precipitate.Type: GrantFiled: March 28, 1997Date of Patent: September 1, 1998Assignee: Robert M. GaudetteInventor: Robert M. Gaudette
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Patent number: 5783084Abstract: A process wastewater treatment plant, and a process relating thereto, which converts process wastewater generated in battery manufacturing and the like into clean process water and sodium sulfate salt by treating the process wastewater to remove impurities and contaminants, including debris, oil/grease, heavy metal oxides, lead and other heavy metals, suspended solids, bacteria, organic compounds, and/or gases, from the wastewater to produce a clean neutral sodium sulfate brine, subjecting the brine to heat to obtain distilled water and sodium sulfate salt, and purifying the distilled water by reverse osmosis for reuse as clear process water.Type: GrantFiled: May 1, 1997Date of Patent: July 21, 1998Inventor: Charles M. Suenkonis
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Patent number: 5776881Abstract: A treated solvent composition for washing mechanical parts or the like. The solvent contains not more than about 25% aromatic solvents with the balance being aliphatic and other non-aromatic solvents having a flashpoint of at least 100.degree. F. The solvent is treated with up to 10 parts of an additive composition selected from the group consisting of C.sub.14 and lower alcohols, diols, polyols, lower glycols, and lower glycol ethers and mixtures thereof. In use, finely dispersed contaminant particles settle from the body of the solvent more rapidly than in untreated solvent and the resulting clarified appearance enables the solvent to be used longer and more effectively in a cleaning operation.Type: GrantFiled: July 3, 1996Date of Patent: July 7, 1998Assignee: Safety-Kleen Corp.Inventor: Esfandiar Kiany
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Patent number: 5770091Abstract: An untreated flow of waste water is normally introduced into a plain sedimentation unit during plain sedimentation periods to separate it into sand and a flow treated by plain sedimentation. During other periods, for example periods of heavy rain, a coagulating agent, ballast sand and a flocculating agent are introduced. The coagulated flow is passed into a maturation intermediate area and then, with substantially all the sand and colloids of particles attached to it, into the plain sedimentation unit. Here effluent is separated by plain sedimentation and evacuated and sludge made up of the sand and the adhering colloids and particles is extracted and evacuated via an extraction system and the sand outlet channel of the plain sedimentation unit. The sludge is collected, the ballast sand is separated from it to be recycled into the sand injection area and the sludge and excess sand are extracted.Type: GrantFiled: August 27, 1996Date of Patent: June 23, 1998Assignee: Omnium de Traitement et de ValorisationInventors: Patrick Binot, Valery Ursel, Michel Badard
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Patent number: 5766485Abstract: Alum process residues (APR) are used to remove colored contaminants from waste waters. In addition, in accordance with the invention, up to 0.1% by weight of alum and up to 5 ppm of a polyelectrolyte polymer is added to improve color removal, turbidity removal and the settling rate. The resultant APR-alum-polymer mixture together with contaminants in the waste water settles rapidly, reducing the costs of the color removal process.Type: GrantFiled: June 6, 1995Date of Patent: June 16, 1998Assignee: General Chemical CorporationInventors: Christopher Bruce Lind, David Kisling Kennedy
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Patent number: 5759411Abstract: A horizontally-mounted, rotatable drum for mixing chemical additives with an aqueous suspension in order to promote agglomeration of suspended solids and for simultaneously separating water from them. With the drum, slurries of mining silt, clay, sludge and the like already partially dewatered to between about 50% and 60% moisture content can be further dewatered; reductions to 40% moisture content have been obtained. Supplied as a wet slurry to the drum through a hollow tube which also serves as an axle, the slurry is diverted, through a tubular branch fluidly connected to the tube, towards a vertical wall forming one end of the drum. Fed at a rate of between 200 and 300 gallons per minute, the slurry forcefully impinges against the vertical wall, simultaneously subjecting agglomerated particles in the slurry to high shear forces and freeing water. Downstream, before each of two spaced apart, annular retaining rings affixed to the drum, the slurry tends to pool.Type: GrantFiled: July 5, 1996Date of Patent: June 2, 1998Inventor: Dennis D. Gold
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Patent number: 5759401Abstract: An improved process for removing phosphate from waste water comprising simultaneously injecting a coagulating agent upstream and downstream of a stage of biological oxidation in aerobic medium.Type: GrantFiled: January 22, 1996Date of Patent: June 2, 1998Assignee: Elf Atochem S.A.Inventors: Jean-Fran.cedilla.ois Boussely, Marin Dernat, Pierre Elmerich
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Patent number: 5753125Abstract: A method for recovering and separating precious and non-precious metals from waste streams, which removes, separates, and recovers such metals in a cost effective manner with more than 95% removal from waste streams and with minimal amounts of umprocessed solids and sludge remaining in the enviroment. Metals such as chromium, manganese, cobalt, nickel, copper, zinc, silver, gold, platinum, vanadium, sodium, potassium, beryllium, magnesium, calcium, barium, lead, aluminum, tin; and the like are removed and recovered from the waste streams with at least 95% removal and other metals and compounds, such as antimony, sulfur, and selenium are removed and recovered from waste streams with at least 50% removal. The method employs a unique complexing agent comprising a carbamate compound and an alkali metal hydroxide which facilitates the formation of the metals into ionic metal particles enabling them to be readily separated, removed and recovered.Type: GrantFiled: August 13, 1996Date of Patent: May 19, 1998Inventor: Lawrence Kreisler
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Patent number: 5750034Abstract: The invention comprises a method for clarifying ink-laden water obtained from the recycling of paper stocks by treating said water with a conventional coagulant followed by treatment with a hydrophilic dispersion polymer. The hydrophilic dispersion flocculant of the invention is a copolymer of dimethylaminoethyl (meth)acrylate methyl chloride quat (DMAEA.multidot.MCQ) cationic monomer and (meth)acrylamide (AcAm). Following dosing with the flocculant, a floc is formed. The floc contains ink and impurities which are removed from the water process stream by means of solid liquid separation; the solid liquid separation comprising a dissolved air flotation method.Type: GrantFiled: November 1, 1996Date of Patent: May 12, 1998Assignee: Nalco Chemical CompanyInventors: Jane B. Wong Shing, Karen R. Tubergen
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Patent number: 5750033Abstract: The invention relates to the treatment of waste water containing a harmful ion such as a heavy metal ion or fluorine ion by the coagulating sedimentation method using an inorganic coagulant such as an iron compound or an aluminum compound. After separating treated water from the sediment (sludge) in which the harmful ion is incorporated in insoluble form, the pH of a mixture of the sediment and water is suitably adjusted to cause elution of the harmful ion from the sediment. Then the sediment is separated from the eluate and reused as an inorganic coagulant. By reusing the sediment in this manner, the waste water treatment is accomplished without producing a large quantity of sludge and the consumption of inorganic coagulant and auxiliary chemicals can be greatly reduced, while the concentration of the harmful ion in the treated water becomes sufficiently low.Type: GrantFiled: July 31, 1996Date of Patent: May 12, 1998Assignee: NEC CorporationInventors: Kenichi Ikeda, Yuichi Asai, Yuji Arai
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Patent number: 5750035Abstract: A process for dye removal from effluent is disclosed which includes treating the effluent with a reducing agent, adjusting the pH to a selected value in the range of 2-7, treating the effluent with a particular charge neutralization mixture, adjusting the pH a second time and subjecting the mixture to a flocculating process with selected chemicals.Type: GrantFiled: September 20, 1996Date of Patent: May 12, 1998Assignee: Hoechst Celanese CorporationInventors: Paul W. Shepperd, III, Larry W. Becker, Robert J. Cundiff
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Patent number: 5744043Abstract: Stickies derived from pulping or deinking of cellulosic material are controlled by adding to the cellulosic liquor containing the stickies an emulsion in water of cross-linked, insoluble, ionisable and swellable polymer particles.Type: GrantFiled: July 22, 1996Date of Patent: April 28, 1998Assignee: Allied Colloids LimitedInventors: Paul Kenneth Cutts, Anthony John Burke
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Patent number: 5730881Abstract: An improved method for treating over-sprayed, solvent-based paints which comprises adding an effective amount of a chelating agent to the circulating water of a paint spray booth, thereby improving the dispersibillty of solvent-based paints, particularly in high-hardness waters.Type: GrantFiled: September 30, 1992Date of Patent: March 24, 1998Assignee: Calgon CorporationInventor: Joseph P. Miknevich
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Patent number: 5720887Abstract: The present invention provides a method for dewatering sludge that utilizes the step-wise and sequential addition to the sludge of a cationic polyamine and a cationic polyacrylamide.Type: GrantFiled: November 21, 1996Date of Patent: February 24, 1998Assignee: BetzDearborn Inc.Inventors: Stephen R. Vasconcellos, Michael R. Wood, Kimberly A. Bell
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Patent number: 5720886Abstract: Mine waste water is treated to remove both dissolved and particulate metal values by an improved process, the process comprising:A. Mixing with the mine waste water a sufficient amount of anionic polymer to combine with the dissolved and particulate metal values to form a polymer/metal particle complex,B. Mixing the polymer/metal particle complex of Step A with a source of ferric ions, e.g. ferric chloride, to form a ferric/polymer/metal particle complex,C. Mixing the ferric/polymer/metal particle complex of Step B with a source of hydroxyl ions, e.g. a solution of calcium oxide, to form a hydroxylated ferric/polymer/metal particle complex,D. Mixing sufficient flocculent, e.g. a polyacrylamide, with the complex of Step C to precipitate the complex, andE. Separating the slurry of Step D into a clean water effluent and a high density (e.g. >50% solids), low toxic sludge.Type: GrantFiled: October 11, 1996Date of Patent: February 24, 1998Assignee: Kennecott Greens Creek Mining CompanyInventor: Steven R. Iwinski
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Patent number: 5716530Abstract: In the Bayer process for producing alumina from bauxite of the type wherein the bauxite is added to a caustic solution to produce a soluble aluminate solution and an insoluble red mud fraction which is then subjected to one or more separation steps to produce a thickener overflow which is then subjected to a Sand Filter to polish the thickener overflow the improvement which comprises treating the thickener overflow with a solids removal efficiency improving amount of a biopolymer.Type: GrantFiled: December 13, 1996Date of Patent: February 10, 1998Assignee: Nalco Chemical CompanyInventors: Michael G. Strominger, Keith D. Gibbs
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Patent number: 5707532Abstract: Compositions comprising polyamine and melamine polymers in certain ratios are provided for coagulating suspended solids in wastewaters such as deinking process waters and raw waters.Type: GrantFiled: September 17, 1996Date of Patent: January 13, 1998Assignee: Cytec Technology Corp.Inventors: Gerald Guerro, Wendy L. DiNicola, Nicole Richards
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Patent number: 5698109Abstract: An aqueous suspension of coagulatable material is coagulated by adding polymeric coagulant to the suspension and then separating the resultant coagulated material from the liquor. The coagulatable material may be present in the aqueous suspension as a suspension of suspended solids or as colloidally dispersed solids. The suspension may be coal tailings or other aqueous (generally mineral) suspension. The polymeric material must be a low molecular weight, highly ionic, polymeric material formed from a diallyl dialkyl ammonium salt. It is added to the aqueous suspension while in the form of polymeric particles having a size mainly above 30 .mu.m and that will dissolve into the suspension and coagulate the coagulatable material. An anionic high molecular weight, flocculant is generally added subsequently in order to flocculate the coagulated material.Type: GrantFiled: February 23, 1996Date of Patent: December 16, 1997Assignee: Allied Colloids LimitedInventors: Geoffrey L. Payne, Hubert Fairchild, Jr.