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| Number | Title | Issue Date |
| 7820057 | Method for removing at least one constituent from a solution The invention relates to a method for removing at least one constituent from a solution, comprising:—forming a liquid mixture by bringing together said solution (1) and a particulate seed material (6) under conditions or in the presence of one or mor... | 10/26/2010 |
| 7481938 | Metal compound removal The present invention relates to a process for separating at least one metal compound and/or a component thereof from a mixture, said process comprising contacting the said mixture with a heteropoly acid or heteropoly acid anion, thereby producing a precipitate comp... | 01/27/2009 |
| 7445718 | Removal of arsenic from drinking and process water A method of removing arsenic and heavy metals from water using metal salt hydroxidegels is provided. The arsenic present in water is adsorbed onto the hydroxide-gels which can effectively be filtered through a diatomaceous earth (DE) filtration bed. The combination ... | 11/04/2008 |
| 7419603 | Water treatment method The present invention provides a physical water treatment (PWT) method and apparatus to treat liquid coolants. Electrodes (22, 24) are provided in a coolant stream (21), and an alternating voltage is applied across the electrodes (22, 24) to pro... | 09/02/2008 |
| 7407582 | Combination activated sludge—ballasted flocculation process A method and system for treating water or wastewater to remove both soluble BOD and suspended solids. The method entails directing first and second water or wastewater streams to a treatment system including an activated sludge system and a ballasted flocculation sy... | 08/05/2008 |
| 7374687 | Method of decolorizing stock-raising treatment water A decolorization treatment method in which not only can a liquid that has been obtained by treating raw water that is stock-raising treatment water in a purifier tank be decolorized swiftly with simple equipment, but moreover the treatment water can be purified to a... | 05/20/2008 |
| 7347947 | Methods for filtrating and producing polymer solution, and for preparing solvent A cellulose acetate solution is filtrated with a filter medium formed of cellulose fiber. Hydroxyl groups on the filter medium are substituted to other functional groups. An acidic material is added to the cellulose acetate solution, and the filtration is preformed.... | 03/25/2008 |
| 7341668 | Filter aid and method of using same for reclaiming water-based fluids used in metal working processes A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic p... | 03/11/2008 |
| 7338605 | Filter aid and method of using same for reclaiming water-based fluids used in metal working processes A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic p... | 03/04/2008 |
| 7338604 | Process for recycling paint flush solution A process for removing solids from a water-based flush solution, The process includes: providing dirty flush solution; directing the dirty flush solution to a treatment vessel; adding one or more chemicals to the treatment vessel to form a treated flush solution; se... | 03/04/2008 |
| 7334415 | Cooling system and method for using cooling system A cooling system is provided having a first heat exchanger for heating a cooling liquid, a second heat exchanger, which preferably comprises an evaporator, for cooling the cooling liquid, and a pump for guiding the cooling liquid through the first and second heat ex... | 02/26/2008 |
| 7300589 | Process for removing arsenic from aqueous streams Arsenic is removed from water and other aqueous feeds by (1) treating the feed with a compound containing cerium in the +4 oxidation state, preferably cerium dioxide, to oxidize arsenic in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing ... | 11/27/2007 |
| 7293423 | Method and apparatus for controlling freezing nucleation and propagation An apparatus and method of controlling freezing in a liquid system is disclosed. The apparatus includes a heat exchanger having a initial zone characterized by a surface area to volume ratio. The apparatus also includes means for initiating freezing of a fluid from ... | 11/13/2007 |
| 7267777 | Method for the removal of contaminant metal ions from waste water 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. ... | 09/11/2007 |
| 7255793 | Methods for removing heavy metals from water using chemical precipitation and field separation methods 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, effectivel... | 08/14/2007 |
| 7247242 | Arsenic removal from water Methods for removing arsenic from water by addition of inexpensive and commonly available magnesium oxide, magnesium hydroxide, calcium oxide, or calcium hydroxide to the water. The hydroxide has a strong chemical affinity for arsenic and rapidly adsorbs arsenic, ev... | 07/24/2007 |
| 7247282 | Method for the removal of metals from an aqueous solution using lime precipitation The invention relates to a method for the removal of metals from their aqueous solution with lime precipitation, in conditions where a precipitate of metal hydroxide and gypsum is formed, which settles well and is easy to filter. The metals are precipitated from the... | 07/24/2007 |
| 7244360 | Water treatment process The present invention provides a physical water treatment (PWT) method and apparatus to treat liquid coolants. Electrodes (22, 24) are provided in a coolant stream (21), and an alternating voltage is applied across the electrodes (22, 24) to pro... | 07/17/2007 |
| 7244362 | Water treatment by ballasted flocs and degreasing The invention concerns the use of a coagulation-flocculation-decantation device for water treatment to degrease water inside the device itself so as to eliminate therefrom more than 20% of hexane-extractable matter without resorting to separate degreasing means by f... | 07/17/2007 |
| 7207748 | Water collection and distribution system for yard maintenance A water collection and distribution system for yard maintenance includes a buried reservoir for collecting water from the roof of a structure and a submersed pump in the reservoir for supplying contained water to a pressurized manifold having outlets available for y... | 04/24/2007 |
| 7189328 | Method for extraction of dissolved trace materials from solution A method for separating dissolved materials, including organic and inorganic solids and volatile constituents, from a liquid or aqueous solvent is disclosed. The method first extracts water from the flow stream being treated using a crystallization apparatus which f... | 03/13/2007 |
| 7179385 | Method for treating paint booth water systems The invention is a composition and method for treating paint booth water systems to facilitate paint removal. The composition comprises water, solid particles of insoluble organic polymer, such as, by way of non-limiting example, urea methanal copolymer, preferably ... | 02/20/2007 |
| 7157008 | Apparatus and process for water conditioning A conditioning process and equipment are provided for removing hardness from water circulated in a system, such as an evaporative cooling system. A sidestream from such system is routed to a reaction chamber and back to the system. A conditioner is added to the side... | 01/02/2007 |
| 7138528 | Method for crystallizing N-vinyl-2-pyrrolidone A method for purifying N-vinyl-2-pyrrolidone (NVP) is disclosed. The method comprises crystallizing NVP in the presence of added water to produce purified NVP crystals and a mother liquor, and then isolating the purified crystals. In a preferred method, 0.5 to 4 wt.... | 11/21/2006 |
| 7077963 | Processes for water treatment The invention provides compositions comprising bauxite refinery residues that have been reacted with sufficient calcium and magnesium ions that they have a reaction pH of less than 10.5, and one or more water treating additives. The invention also provides processes... | 07/18/2006 |
| 7077968 | Method for continuously filtering raw brine for use in chlor-alkali electrolysis The method of continuously processing raw brine with a solids content to obtain substantially solids-free pure brine (E) for use in chlor-alkali electrolysis. In this method the raw brine (A) is separated, by means of a decanter (1), into a clear brine (B) wi... | 07/18/2006 |
| 7048859 | Method for treatment of aqueous streams comprising biosolids A process is provided which can be used to clarify substantially aqueous streams and optionally separate biosolids, especially proteins, from food processing operations which comprises contacting an aqueous stream comprising biosolids with an anionic inorganic collo... | 05/23/2006 |
| 7048860 | Material for treating acidic waste water This invention relates to a method for treating acidic waste water, particularly mine effluent, and to a solid waste water treating material useful for the method. This waste water treating material is obtained by solidifying a mixture of rock wool and an inorganic ... | 05/23/2006 |
| 7045066 | Method of arsenic immobilization in crystalline form from water A method of removing arsenic from water by using a reactor that is provided with a fluidized bed of carriers is disclosed. An arsenic-containing influent is mixed in the reactor with a sulfide aqueous solution or metallic salt aqueous solution at a predetermined pH,... | 05/16/2006 |
| 7041268 | Process for recovery of sulphate of potash The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ... | 05/09/2006 |
| 7037480 | Calcium chloride purification Significant amounts of soluble fluoride, known to create problems in processes requiring high quality grade calcium chloride, are removed from calcium chloride solution using hydroxyapatite as a removal mechanism. Under acidic conditions, calcium chloride solution i... | 05/02/2006 |
| 7033507 | Method for removing metals from acid mine drainage A method for removing metal contaminants from acidic mine wastewater using lignin derivatives, such as lignosulfonates and kraft lignin, an alkali coagulant, such as a lime compound, and an alkaline composition for increasing the pH. The lignin derivatives are dispe... | 04/25/2006 |
| 7014776 | Contaminant removal method for a body of water Pollutants, such as heavy metals, phosphorus, and pathogenic organisms, are removed from water by adding a chemical coagulant to the water within an enclosure. The water and the coagulant are mixed, and coagulation and flocculation are permitted to occur. The mixing... | 03/21/2006 |
| 7014770 | Filtering method of a colloidal solution A filtering method is directed to a wastewater of CMP process, which includes sub-micrometer particles suspended as colloid. The wastewater is filtered by a gel membrane formed on a surface of plastic filter. A coagulant or a pH adjuster is added to the wastewater s... | 03/21/2006 |
| 7001525 | Method for the treatment of water by ballasted flocculation and gravity separation with variable function modes The invention relates to a method for treatment of water, permitting the physico-chemical treatment of water, including a ballasted flocculation stage using a granular ballast material with a density greater than water, followed by, a stage of gravity separation of ... | 02/21/2006 |
| 6966993 | Method and plant for thickening sludge derived from water treatment by flocculation-decantation with ballasted floc A method is provided for thickening sludge produced through a ballasted flocculation process. The sludge and granular material from the ballasted flocculation process are directed to a sludge separator where the sludge is separated from the granular material. Therea... | 11/22/2005 |
| 6960303 | Alum pellets Compositions including pellets of alum, a smectite mineral material and optionally sodium or calcium carbonate that can be delivered to a phosphate impoundment located at the bottom of a body of water at the bottom. The pellets of alum, smectite mineral material and... | 11/01/2005 |
| 6942809 | Method for treating soybean refinery wastewater This invention relates to a method for treating soybean refinery wastewater. More particularly, this invention relates to a method for treating soybean refinery wastewater with an aqueous iron salt solution to produce purified water. An aqueous iron salt solution is... | 09/13/2005 |
| 6919031 | Method of treating water and wastewater with a ballasted flocculation process and a chemical precipitation process The present invention is directed to a method and apparatus for the treatment of water and wastewater. In one embodiment, a method of treating water according to the present invention includes mixing sludge and precipitant with the water to be treated, mixing ballas... | 07/19/2005 |
| 6896815 | Methods for removing heavy metals from water using chemical precipitation and field separation methods 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 ... | 05/24/2005 |
