Color Patents (Class 210/917)
-
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.
-
Patent number: 5670020Abstract: The invention described in the specification relates to a process and apparatus for reducing AOX, COD and color bodies from the filtrate streams generated by a kraft pulp bleaching sequence. The method involves vigorously mixing an F.sub.D filtrate with an F.sub.E filtrate to form a filtrate mixture and treating the filtrate mixture with a coagulating compound, a flocculating compound and recycled foam concentrate. After chemically treating the filtrate mixture, the mixture is foamed with air in order to capture floc which formed in the mixture. Concentration of the foam and recycle of the foam to the filtrate mixture has been found to significantly increase the concentration of and reduce the amount of solids generated in the treatment system.Type: GrantFiled: June 1, 1995Date of Patent: September 23, 1997Assignee: International Paper CompanyInventors: Caifang Yin, Christopher P. Hung
-
Patent number: 5639379Abstract: A process for removing both color and odor from wastewater effluent that is contaminated from dye complexes, such as azo dye complexes, used for dyeing textiles to be various colors. The process requires treatment of the effluent with alkali metal permanganate, followed by treatment with hydrogen peroxide, followed by treatment a primary coagulant as a flocculation initiator (together with pH control so that the pH is basic), followed by treatment with a water soluble polymer, and followed by separating precipitated flocculated material from the effluent to obtain a clear effluent free of color and odor.Type: GrantFiled: July 8, 1996Date of Patent: June 17, 1997Assignee: Environmental Wastewater Services, Inc.Inventor: Leonard E. Stogner, Jr.
-
Patent number: 5611934Abstract: 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: December 18, 1995Date of Patent: March 18, 1997Assignee: Hoechst Celanese CorporationInventors: Paul W. Shepperd, III, Larry W. Becker, Robert J. Cundiff
-
Patent number: 5589075Abstract: The invention is a process for removing color from a paper mill waste effluent containing color bodies which comprises: treating the waste effluent containing color bodies with an effective color-removing amount of a water-soluble silicon-containing copolymer coagulant prepared from diallyldimethylammonium halide and a vinyltrialkoxysilane; coagulating the color bodies present in the waste effluent; and then removing the coagulated color bodies from the waste effluent.Type: GrantFiled: November 30, 1995Date of Patent: December 31, 1996Assignee: Nalco Chemical CompanyInventors: Ananthasubramanian Sivakumar, John H. Collins, Manian Ramesh
-
Patent number: 5543056Abstract: A method for treating water using natural polymers that provide an alternate and improved means to achieve enhanced coagulation is described. A method for removing particles, color, and color from drinking water, comprising adding a primary coagulant such as a natural, cationic polymer like chitosan or a cationic starch and a coagulant aid such as bentonite to drinking water to form a mixture. A preferred concentration weight ratio of natural polymer to clay mineral is between 1:5 and 1:20.A composition for removing particles and color from drinking water is described that includes a natural, cationic polymer coagulant and clay mineral in a total amount effective to coagulate suspended material in the drinking water. The composition includes a weight ratio natural polymer coagulant/clay mineral of between about 1:5 to about 1:20.Type: GrantFiled: June 29, 1994Date of Patent: August 6, 1996Assignee: Massachusetts Institute of TechnologyInventors: Susan E. Murcott, Donald R. F. Harleman
-
Patent number: 5529697Abstract: Potassium permanganate is added to paper mill wastewater streams at an elevated temperature to remove color compounds from the effluent streams. The potassium permanganate causes the formation of flocculant particles which are precipitated out of the stream. This precipitate is then treated with acid to cause resolubilization.Type: GrantFiled: July 20, 1994Date of Patent: June 25, 1996Assignee: The University of Southern MississippiInventors: Dwaine A. Braasch, R. D. Ellender
-
Patent number: 5518627Abstract: A method for demineralizing water or an aqueous solution, which comprises contacting the water or the aqueous solution to be treated to a strongly basic anion exchanger made of a crosslinked polymer having a constituting unit of the following formula (I): ##STR1## wherein A is a C.sub.1-2 linear alkylene group, B is a C.sub.4-8 linear alkylene group, each of R1, R2 and R3 which may be the same or different, is a C.sub.1-4 alkyl group or a C.sub.2-4 alkanol group, X is a counter ion coordinated on the ammonium group, and the benzene ring D may have an alkyl group or a halogen atom as a substituent.Type: GrantFiled: March 1, 1995Date of Patent: May 21, 1996Assignees: Mitsubishi Chemical Corporation, Tohoku Electric Power Co., Inc.Inventors: Masao Tomoi, Teruo Onozuka, Manabu Shindo, Hideaki Kiniwa, Hirohisa Kubota, Shintaro Sawada
-
Patent number: 5500125Abstract: A method of treating photoprocessing wash water, comprising in sequence, the steps of:A) contacting the wash water with an acrylic anion exchange resin to remove silver thiosulfate complex in the water; andB) contacting the water from step A) with an oxidizing agent that converts thiosulfate ions to sulfate ions.C) recirculating continuously through the photoprocessing wash tank and steps A) and B).Type: GrantFiled: May 19, 1994Date of Patent: March 19, 1996Assignee: Eastman Kodak CompanyInventors: Richard R. Horn, Christine K. Gaskell, Susan R. Krauss, Michael D. Purol
-
Patent number: 5476594Abstract: The invention comprises a process for removing true and apparent color from pulp and paper waste waters. It comprises treating these waste waters with a vinylamine polymer including from about 1 to about 100 mole percent vinylamine and from about 1 to about 99 mole percent of at least one monomer selected from the group consisting of amidine vinylformamide, vinyl alcohol, vinyl acetate, vinyl pyrrolidinone and the esters, amides, nitriles and salts of acrylic acid and methacrylic acid.Type: GrantFiled: May 9, 1994Date of Patent: December 19, 1995Assignee: Nalco Chemical CompanyInventors: John H. Collins, Dodd Fong, Anthony G. Sommese, Amy M. Tseng
-
Patent number: 5454955Abstract: Hectorite is utilized in conjunction with a water soluble cationic coagulant to clarify waste water from the deinking of waste paper.Type: GrantFiled: March 25, 1994Date of Patent: October 3, 1995Assignee: Nalco Chemical CompanyInventors: William E. Albrecht, David W. Reed, James H. Smith
-
Patent number: 5437797Abstract: Method for removal of organic and inorganic mercury contaminants from a biological vaccine production facility.Type: GrantFiled: June 14, 1994Date of Patent: August 1, 1995Assignee: American Home Products CorporationInventor: Edward G. Helmig
-
Patent number: 5435922Abstract: A method for removing color from a paper mill waste effluent which comprises the step of adding a low molecular weight hydrophobic polymer dispersion to the effluent. The hydrophobic dispersion is preferably formed from the precipitation polymerization of at least one hydrophilic monomer and a hydrophobic monomer in the presence of a precipitation aid, water, a chain transfer agent, and an initiator.Type: GrantFiled: June 14, 1993Date of Patent: July 25, 1995Assignee: Nalco Chemical CompanyInventors: Manian Ramesh, Chandrashekar S. Shetty
-
Patent number: 5435921Abstract: The invention comprises a process for removing true and apparent color from pulp and paper waste waters. It comprises treating these waste waters with a coagulant and vinylamine polymer. The coagulant is selected from the group consisting of epichlorohydrin-dimethylamine, guanidine-formaldehyde condensation polymers, cyanoguanidine-formaldehyde condensation polymers, urea-formaldehyde condensation polymers, polyethyleneimines, polydiallyldimethylammonium chloride, copolymers of polydiallyldimethylammonium chloride and acrylamide, and ethylenedichloride-ammonia. The vinylamine polymer includes from about 1 to about 100 mole percent vinylamine and from about 1 to about 99 mole percent of at least one monomer selected from the group consisting of amidine vinylformamide, vinyl alcohol, vinyl acetate, vinyl pyrrolidinone and the esters, amides, nitriles and salts of acrylic acid and methacrylic acid.Type: GrantFiled: May 9, 1994Date of Patent: July 25, 1995Assignee: Nalco Chemical CompanyInventors: John H. Collins, Dodd W. Fong, Anthony G. Sommese, Amy M. Tseng
-
Patent number: 5429747Abstract: The invention is a method for the treatment and decolorization of waste water incident to the manufacturing of cosmetic products that contains dyestuffs, fatty organic chemicals and other organic chemicals. The method requires a strong base which is added to the waste water at a suitably high temperature to cause flocculation of fatty substances. Then an strong colorless oxidizer is added to reduce the hydrophilic character of the remaining organic chemicals and cause partial decolorization. The resulting waste water is in a state that can then be decolorized with powdered activated carbon. Finally, the powdered activated carbon is separated from the waste water. The decolorized waste water is discharged in compliance with acceptable water quality standards for plant effluents.Type: GrantFiled: June 7, 1994Date of Patent: July 4, 1995Assignees: University of Maryland, College Park, Goldwell Cosmetics Inc.Inventors: Charles W. Carr, Ralf Zissel
-
Patent number: 5413719Abstract: A method for optimizing the dosage of a polyelectrolyte treating agent in a water treatment process using a fluorescent material having the opposite electrical charge as a polyelectrolyte treating agent used to treat water in a water treatment process.Type: GrantFiled: January 18, 1994Date of Patent: May 9, 1995Assignee: Nalco Chemical CompanyInventors: Ananthasubra Sivakumar, Jitendra Shah, Narasimha M. Rao, Scott S. Budd
-
Patent number: 5411569Abstract: A process is provided for preparing preferred iron humate products. The preferred iron humate products provide iron and other nutrients and organic matter for vegetation and supplementation of animal feedstocks. The preferred iron humate products are produced by using an iron salt coagulant that is relatively free of heavy metal contaminants and reacting the iron salt coagulant with naturally occurring humic substances such as those found in natural surface waters used in drinking water treatment facilities. According to the invention, iron is stoichiometrically reacted at a controlled pH with the humic and fulvic acid fractions in the water to precipitate an iron humate product precipitate. A preferred concentration of iron salt coagulants is used in order to minimize the formation of iron hydroxides.Type: GrantFiled: March 14, 1994Date of Patent: May 2, 1995Assignee: Kemiron, Inc.Inventor: Lawrence N. Hjersted
-
Patent number: 5403494Abstract: An improved process is provided for the steam conversion of dilute printer ink washup fluids, and especially those of a single color, in order to permit reuse of the ink fraction of the fluids as reconstituted printing inks. Preferably, the washup fluids are acidified to create a pin floc therein, with a final pH of from about 2-7; the acidified fluid is then contacted with a stream of steam in a hydroheater (16) in order to convert the residual ink fraction and permit reconstitution thereof into printing ink. The acidifying agent is preferably an acid polymer or an inorganic acid such as HCl or H.sub.2 SO.sub.4.Type: GrantFiled: July 15, 1993Date of Patent: April 4, 1995Assignee: The Lawrence Paper CompanyInventor: Michael D. Cain
-
Patent number: 5380444Abstract: Quaternary dialkylaminomethyl polymers derived from (alk)acrylamide and about 1 to about 15 mole percent ethylenically unsaturated anionic comonomer wherein the resulting ampholytic polymer has a standard viscosity of at least about 2.1 cps are disclosed. Processes for the preparation of these polymers and their use in flocculating suspended material in paper deinking sludges and deinking process waters are also disclosed.Type: GrantFiled: February 23, 1994Date of Patent: January 10, 1995Assignee: Cytec Technology Corp.Inventors: Michael S. Ryan, David L. Dauplaise, Robert J. Proverb
-
Patent number: 5378367Abstract: A method for treating a pulp and paper manufacturing stream to remove colorants therefrom comprises: contacting the stream with a first adsorbent comprising the calcined product of a compound having the formula: A.sub.w B.sub.x (OH).sub.y C.sub.z.nH.sub.2 O, wherein A represents a divalent metal cation; B a trivalent metal cation; C a mono- to tetravalent anion; and w, x, y, z and n satisfying the following: 0<z.ltoreq.x.ltoreq.4.ltoreq.w.ltoreq.1/2y and 12.gtoreq.n.gtoreq.1/2(w-x); then contacting the stream with a second adsorbent consisting essentially of activated carbon. On a preferred basis, the first contacting adsorbent is a hydrotalcite derivative made by reacting activated magnesia with an aqueous solution of aluminate, carbonate, and hydroxyl anions before calcining at one or more temperatures between about 400.degree.-650.degree. C.Type: GrantFiled: November 25, 1992Date of Patent: January 3, 1995Assignee: Aluminum Company of AmericaInventors: Gary A. O'Neill, George M. Goyak
-
Patent number: 5360551Abstract: A highly colored dye wastewater is treated by a sequence of steps to obtain a color reduction of 90 percent or more. The method requires acidifying the wastewater and adding a cationic flocculant. A reducing agent is then, optionally, added to further reduce the color value of the wastewater and produce an oxidation-reduction potential of at least -200 and, generally, about -400 to -800. The reducing agent is, preferably, either a hydrosulfite or both a bisulfite and an alkali metal borohydride.Type: GrantFiled: April 1, 1993Date of Patent: November 1, 1994Assignee: Crompton & Knowles CorporationInventor: Oscar W. Weber
-
Patent number: 5354350Abstract: A new slow releasing particulate iron humate agricultural nutrient composition exhibiting substantially complete solubility of its iron content in soil solutions as indicated by neutral citrate solubilities, and almost no solubility in water, and a new method for preparing the composition. The method comprises admixing and coreacting iron humate with about equimolar amounts of a divalent metal oxide, an aqueous hydroxide of a monovalent Lewis acid, and a water soluble inorganic phosphate. The iron humate amounts to between 20 and 70 percent of the nutrient particles, and the reaction is carried out at temperatures between 60.degree. and 150.degree. C. for between 4 and 25 minutes.Type: GrantFiled: December 14, 1993Date of Patent: October 11, 1994Assignee: The Vigoro CorporationInventor: William P. Moore
-
Patent number: 5326479Abstract: A process for removing color from a pulp and paper wastewater which comprises the following steps: (a) treating the wastewater with a reducing agent which is capable of inactivating color producing functional groups of the wastewater; and (b) treating the wastewater subsequent to step (a) with a polymer which is capable of removing color from the wastewater.Type: GrantFiled: September 1, 1993Date of Patent: July 5, 1994Assignee: Nalco Chemical CompanyInventors: Jawed M. Sarkar, Amy M. Tseng, John H. Collins
-
Patent number: 5314627Abstract: A hydrophobic polyelectrolyte copolymer which is useful in the removal of color in paper mill waste water. The copolymer preferably comprises an acrylamide and a hydrophobic monomer selected from the group consisting of quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.Type: GrantFiled: September 13, 1993Date of Patent: May 24, 1994Assignee: Nalco Chemical CompanyInventors: Manian Ramesh, Chandrashekar S. Shetty, Martha R. Finck
-
Patent number: 5302180Abstract: A process is provided for preparing preferred iron humate products. The preferred iron humate products provide iron and other nutrients and organic matter for vegetation. The preferred iron humate products are produced by using an iron salt coagulant that is relatively free of heavy metal contaminants and reacting the iron salt coagulant with naturally occurring humic substances such as those found in natural surface waters used in drinking water treatment facilities. According to the invention, iron is stoichiometrically reacted at a controlled pH with the humic and fulvic acid fractions in the water to precipitate an iron humate product precipitate. A preferred concentration of iron salt coagulants is used in order to minimize the formation of iron hydroxides which generally provide low iron availability to the plant. A more readily soluble iron humate complex is produced by the reacting and or blending of the iron humate residue with various nitrogen containing sources.Type: GrantFiled: February 16, 1993Date of Patent: April 12, 1994Assignee: Kemiron, Inc.Inventor: Lawrence N. Hjersted
-
Patent number: 5292441Abstract: The use of quaternized polyvinylamines for use in water clarification is disclosed.Type: GrantFiled: January 12, 1993Date of Patent: March 8, 1994Assignee: Betz Laboratories, Inc.Inventors: Jen-Chi Chen, Stephen R. Vasconcellos, Gerald C. Walterick, Jr., Fu Chen
-
Patent number: 5281338Abstract: A method of decolorising water colored by humic or fulvic acid, such as moorland runoff water, which method comprises bringing the water into contact with chitin or alginic acid as adsorbent. The adsorbent may be recycled after use by treatment with aqueous alkaline solution followed by treatment with an aqueous acid solution.Type: GrantFiled: February 9, 1993Date of Patent: January 25, 1994Assignee: Archaeus Technology Group LimitedInventors: Ralph Harris, Anne M. Jacques, Melanie Brown, Alexander Buchan
-
Patent number: 5273719Abstract: A liquid evaporator includes an air-tight outer container containing liquid therein, the liquid container having support legs adjacent the bottom surface thereof; an inner container mounted on the legs for partitioning the interior space of the outer container, the inner container having a wall made of insulating material; and a heater fixed to an upper portion of the outer container and positioned inside the inner container. The liquid evaporator may be combined with a deodorizing device for forming a urine treating device, wherein the urine treating device includes a deodorizing housing having an upper portion provided with a secondary heater therein, a catalyst surrounding the secondary heater, a blower provided outside the housing, and a diffusion pipe provided at the upper portion of the housing.Type: GrantFiled: June 22, 1992Date of Patent: December 28, 1993Assignee: Japanic CorporationInventors: Mitsuhiro Kishi, Toyohiko Sunaoka
-
Patent number: 5269941Abstract: Effluent containing inks undergoes flocculation by the action of a flocculating agent, followed by the continuous centrifuging of the effluent consisting of an acceleration between 1,000 and 20,000 g, while avoiding an air-liquid interface during centrifuging.Type: GrantFiled: July 8, 1992Date of Patent: December 14, 1993Assignee: La Cellulose du Pin c/o Saint-Gobain RechercheInventors: Etienne Chavel, Pierre Langlade, Jean-Claude Pommier
-
Patent number: 5266201Abstract: The invention relates to a process for the purification of aqueous solutions polluted by nitrate ions. This process is characterised in that it consists in precipitating hydrated double or mixed calcium nitroaluminates, such as, in particular, hydrated calcium mononitroaluminate, by adding at least one agent supplying the element aluminium and at least one agent supplying the element calcium to the solutions to be treated, the overall mole ratio of the element aluminium to nitrate, Al/NO3, being superior to 1 and the overall mole ratio of calcium to nitrate, Ca/NO3, being superior to 2, and in that the precipitation reaction is performed with stirring and at a basic pH, preferably above 10.5.The process according to the invention is intende, in particular, to the treatment of polluted waters such as municipal waste water and factory effluents and to the treatment of liquid manure.Type: GrantFiled: April 26, 1993Date of Patent: November 30, 1993Assignee: Lafarge Fondu InternationalInventors: Jean-Pierre Letourneux, Alain Bourdeau
-
Patent number: 5228995Abstract: A biochemically enhanced hybrid anaerobic reactor (BEHAR) system has been developed for treatment of high strength industrial wastewaters. The process is designed and operated based on specific criteria developed around critical biochemical and microbiological principles of the facultative and anaerobic microorganisms involved in anaerobic treatment. Biological kinetic relationships developed by the inventor for substrate removal, methane gas production, and biogas quality control as a function of the mass substrate loading rate are used for designing and operating the BEHAR process. A specific formulation of biological growth micronutrients has been developed for enhancing the anaerobic treatment process. Ferric chloride, one of the chemicals used as a micronutrient, is also utilized for sulfide toxicity control, biogas cleaning without scrubbing, and odor control.Type: GrantFiled: April 23, 1992Date of Patent: July 20, 1993Inventor: Enos L. Stover
-
Patent number: 5213692Abstract: A process is provided for preparing preferred iron humate products. The preferred iron humate products provide iron and other nutrients and organic matter for vegetation. The preferred iron humate products are produced by using an iron salt coagulant that is relatively free of heavy metal contaminants and reacting the iron salt coagulant with naturally occurring humic substances such as those found in natural surface waters used in drinking water treatment facilities. According to the invention, iron is stoichiometrically reacted at a controlled pH with the humic and fulvic acid fractions in the water to precipitate an iron humate product precipitate. A preferred concentration of iron salt coagulants is used in order to minimize the formation of iron hydroxides which generally provide low iron availability to the plant. A more readily soluble iron humate complex is produced by the reacting and or blending of the iron humate residue with various nitrogen containing sources.Type: GrantFiled: August 28, 1991Date of Patent: May 25, 1993Assignee: Kemiron, Inc.Inventor: Lawrence N. Hjersted
-
Patent number: 5207924Abstract: Novel copolymers of polydiallyl dimethyl ammonium chloride and 3-acrylamido-3-methylbutanoic acid are useful in the clarification of deinking paper mill waste water resulting from the processing of recycled paper stock.Type: GrantFiled: June 19, 1992Date of Patent: May 4, 1993Assignee: Nalco Chemical CompanyInventors: Peter E. Reed, Karen R. Tubergen
-
Patent number: 5202028Abstract: Metal complex dyes which are free of reactive groups and have at least one hydroxysulfonyl group are removed from wastewaters by means of amines of at least 6 carbon atoms in the presence or absence of water-immiscible inert organic solvents.Type: GrantFiled: September 3, 1992Date of Patent: April 13, 1993Assignee: BASF AktiengesellschaftInventors: Wolf-Dieter Kermer, Ingrid Steenken-Richter, Juergen Paulig
-
Patent number: 5200089Abstract: The invention provides a method for decolorizing an effluent stream from a pulp mill plant comprising the step of adding an effective amount of a decolorizing composition including a ferrous sulfate and a water-soluble cationic amine polymer.Type: GrantFiled: August 12, 1991Date of Patent: April 6, 1993Assignee: Nalco Chemical CompanyInventors: Kristine S. Siefert, Manian Ramesh, Martha R. Finck, Chandrashekar S. Shetty
-
Patent number: 5194163Abstract: The present invention is a process for decreasing the concentration of a lignin-containing organic carbon in an aqueous system by incorporating peracetic acid or Caro's acid therein. The process is particularly useful for decolorizing lignin-containing aqueous solutions such as effluents from a pulp mill.Type: GrantFiled: December 16, 1991Date of Patent: March 16, 1993Assignee: FMC CorporationInventor: R. Kent Saugier
-
Patent number: 5192452Abstract: This invention relates to a catalyst for use in water treatment and to a method for the water treatment by the use of the catalyst. The catalyst comprises a first catalyst component e.g. the oxide of titanium, silicon, aluminum and zirconium, and a second catalyst component e.g. manganese, iron, cobalt, nickel, cerium, tungsten, copper, silver, gold, platinum, palladium, rhodium, ruthenium, and iridium or a sparingly water-soluble compound of the metal.Type: GrantFiled: October 24, 1991Date of Patent: March 9, 1993Assignee: Nippon Shokubai Kagaku Kogyo, Co., Ltd.Inventors: Kiichiro Mitsui, Tooru Ishii, Sadao Terui, Kunio Sano, Akira Inoue
-
Patent number: 5190669Abstract: The present invention is a process for decreasing the concentration of a lignin-containing organic carbon in an aqueous system by a combination of ozone and hydrogen peroxide. The process is particularly useful for decolorizing lignin-containing aqueous solutions such as effluents from a pulp mill.Type: GrantFiled: November 25, 1991Date of Patent: March 2, 1993Assignee: FMC CorporationInventor: A. Thomas Weibel
-
Patent number: 5180497Abstract: A method for the decolorization of waste water containing coloring matters comprising dyestuff and/or pigment, in which PVA is added to a waste water containing coloring matters as above mentioned so as to catch the coloring matters in the waste water into the PVA, a precipitant of the coloring matters is added to the resultant waste water so as to render the coloring matters absorbed onto the PVA insoluble, a coagulant of PVA is added to the waste water so as to make the PVA insoluble, and then the thus insolubilized PVA containing the coloring matters is separated for the recovery thereof, and thus the decolorization of a waste water containing the coloring matters can be done skillfully and economically by eliminating the drawbacks in the conventional arts.Type: GrantFiled: September 11, 1991Date of Patent: January 19, 1993Assignee: Sando Iron Works Co., Ltd.Inventors: Yoshiteru Sando, Eiichi Nakano, Hiroshi Ishidoshiro
-
Patent number: 5178762Abstract: A method for oxidizing organic and/or heavy metal contaminants in wastewaters, sludges, or soils containing such contaminants by contacting the wastewaters, sludges, or soils with soybean peroxidase and a peroxide.Type: GrantFiled: April 29, 1992Date of Patent: January 12, 1993Assignee: The Mead CorporationInventors: Alexander R. Pokora, Mark A. Johnson
-
Patent number: 5178774Abstract: 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. 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. A counterionic, high molecular weight, flocculant is generally added subsequently in order to flocculate the coagulated material.Type: GrantFiled: June 29, 1990Date of Patent: January 12, 1993Assignee: Allied Colloids LimitedInventors: Geoffrey L. Payne, Hubert Fairchild, Jr.
-
Patent number: 5174904Abstract: A process and apparatus is provided for removing color from a wastewater stream. The process includes directing the wastewater stream through at least one UV reactor and simultaneously injecting a hydrogen peroxide charge into the wastewater stream exactly at the UV irradiation zone of the reactor. The apparatus of the subject invention includes a UV reactor having a smooth flow channel for wastewater and a zone for exposing the wastewater to UV irradiation. The reactor further includes tubing for directing hydrogen peroxide into the reactor exactly at the UV irradiation zone, such that the hydrogen peroxide is introduced simultaneously to the wastewater stream and the UV irradiation zone.Type: GrantFiled: May 6, 1991Date of Patent: December 29, 1992Inventor: J. Edward Smith, II
-
Patent number: 5149442Abstract: The present invention relates to a method of reducing the content of halogenated organic compounds in the spent bleach liquor from the bleaching of lignocellulose-containing material with compounds containing halogen, wherein the spent bleach liquor, in a stage where no essential delignification or bleaching of the pulp takes place, is maintained at a pH of from 2.5 up to about 10, and wherein the residence time and the temperature are selected such that the amount of dissolved halogenated organic substances in the spent bleach liquor is reduced by at least 30%.Type: GrantFiled: April 23, 1991Date of Patent: September 22, 1992Assignee: Eka Nobel ABInventors: Mats G. Nystrom, Kenneth O. Larsson, Anna K. Skogby, Solvie M. Herstad
-
Patent number: 5147532Abstract: A water purification system for treating grey water from household appliances such as baths, showers, vanity basins and washing machine (11-15) has branch-off pipes (29-33) from the usual drain pipes (17-21) these branch-off pipes lead to a storage tank tank (35). The branched off water is filtered by a screen filter (51) then circulated by a pump (53) in series to a heater (55). The system also includes a sediment filter (57), a carbon filter (59), color filter (61), an ultraviolet radiation unit (63), and hence via a shut-off valve (71), to a storage tank (73). The purified grey water can be used for car-washing, and garden and lawn irrigation. The system can be retrofited to an existing home or installed in a new home.Type: GrantFiled: February 21, 1991Date of Patent: September 15, 1992Inventor: Kenneth F. Leek, Jr.
-
Patent number: 5135662Abstract: An on-line monitoring/control method for a separation process used to remove solids from a carrier liquid, wherein a portion of an influent stream containing both the carrier liquid and solids is diverted through a tube after addition of a separation agent, causing slugs of solids to form in the tube which are carried through the tube by clarified carrier liquid in plug flow, and wherein the clarity of the clarified carrier liquid is used to monitor or control the separation process.Type: GrantFiled: October 4, 1990Date of Patent: August 4, 1992Inventor: Bosco P. Ho
-
Patent number: 5128049Abstract: A method for reducing the hydrogen sulfide content of hydrocarbon-containing fluids and aqueous solutions through a two-stage injection procedure whereby a dilute solution of a scavenging agent is injected into a hydrogen sulfide-containing fluid, followed by equilibration and a second injection of dilute solution of scavenging agent to further reduce the hydrogen sulfide content of the treated fluid.Type: GrantFiled: January 22, 1991Date of Patent: July 7, 1992Inventor: Larry W. Gatlin
-
Patent number: 5091089Abstract: Present invention offers, for the first time, a biological approach through the use of white-rot fungi to the decolorization of dye wastewater. It is also applicable to other colored substances and/or their wastewater such as molasses. Because of its low cost, renewable and regenerative activity, and little or no secondary pollution hazard, biological method is the most widely practiced method in nature and in practice in treating organic refuse and industrial waste. Current invention discloses, specifically, undiscovered activities of the Myrothecium and Ganoderma fungi in removing colored substances from dye solutions and dye wastewater. It is the result of a deliberate process of screening for natural water/soil-born and farm/industrial-waste-derived microorganisms for such specific purpose in our laboratory.The accompanied process invention shows that simple biological treatment could also produce consistently effective results in treating a wide spectrum of dye wastewater under greatly varied conditions.Type: GrantFiled: September 6, 1990Date of Patent: February 25, 1992Assignee: Development Center for BiotechnologyInventors: Hwei-Ping Shen, Duen-Gang Mou, Kim-Kee Lim, Paul Feng, Chun-Hwei Chen
-
Patent number: 5075015Abstract: A process for removing color and oxidizable organic matter from thermally conditioned sludge liquor is disclosed. The process comprises treating the liquor with 250 to 430 mg/l chlorine which removes 20 to 70 percent of the color and produces a chlorine residual in the liquor. The chlorine-treated liquor is mixed with a small volume of untreated thermal conditioning liquor to remove the chlorine residual, and the dechlorinated mixture is returned to the treatment plant influent for additional treatment.Type: GrantFiled: May 1, 1991Date of Patent: December 24, 1991Assignee: Zimpro Passavant Environmental Systems, Inc.Inventor: Robert J. Kamke
-
Patent number: 5071569Abstract: A method is disclosed for decolorizing a water body particularly for clarifying the water and removing algae stains in a swimming pool, by establishing in the water body EDTA compound and ammonium ions by the addition of appropriate compounds, and a composition for decolorizing such a water body containing EDTA compound and ammonium salt.Type: GrantFiled: March 22, 1990Date of Patent: December 10, 1991Assignee: Coral International, Inc.Inventors: Paul R. Caulfield, James R. Schueneman
-
Patent number: 5032286Abstract: A method for removing color from the caustic effluent produced during kraft pulping and bleaching is characterized by heating the caustic effluent to a temperature and under a pressure sufficient to cause an alteration in the chemical structure of the lignin chromophores in the effluent. The cooked effluent is cooled and has its pressure reduce to near atmospheric pressure. An acid material, such as chlorine extract from the bleaching process, is added to the effluent to lower the pH of the effluent to between 2.6 and 3.8 to initiate flocculation of the altered chromophores of the effluent. During flocculation, the chromophores are continuously separated from the effluent in order to produce a relatively clean and color-free liquid which may be deposited in the sewer system of the pulp mill.Type: GrantFiled: October 16, 1989Date of Patent: July 16, 1991Assignee: Boise Cascade CorporationInventors: Harold L. Newman, William S. Adams, Jr., Brace Boyden