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| Number | Title | Issue Date |
| 7396458 | Wastewater treatment equipment A wastewater treatment equipment of an embodiment of the present invention neutralizes a WTBT 12 by introducing the WTBT 12 containing fluorine components to a first treatment tank 11A and by introducing an NaOH solution from a second path P2... | 07/08/2008 |
| 7329357 | Method for removing fluorine from a fluorine-containing wastewater 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 waste... | 02/12/2008 |
| 7294276 | Process for preparing fluoropolymer dispersions A process to substantially remove the fluorinated anionic surfactants from fluoropolymer dispersions comprising the following steps: a) addition to the fluoropolymer dispersion of an anionic polyelectrolyte; b) con... | 11/13/2007 |
| 7182873 | Method of fluoride-containing wastewater treatment First, a primary fluoric ion concentration detection process is performed, and a primary calcium salt addition process is performed to add calcium salt in a first reaction tank, wherein the dosage of the calcium salt in the primary calcium salt addition process is d... | 02/27/2007 |
| 7138063 | Method of removing arsenic and other anionic contaminants from contaminated water using enhanced coagulation 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 borat... | 11/21/2006 |
| 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 |
| 7018541 | Removal of fluorinated surfactants from waste water The present invention provides a method of removing a fluorinated surfactant from waste water comprising fluoropolymer particles. The method comprises (i) adding a non-fluorinated surfactant to the waste water (ii) contacting the thus obtained waste water with adsor... | 03/28/2006 |
| 6905606 | Method of removing calcium from water containing calcium hydrogen carbonate in high concentration A method for removing calcium from water containing a high concentration of calcium bicarbonate, permitting a reduction of the calcium bicarbonate equivalent to 200-500 ppm calcium to the level in accordance with the water quality standards for industrial use, not b... | 06/14/2005 |
| 6790358 | Composition for removing trace impurities from inert, non-reactive and reactive liquids Trace impurities such as organic compounds in an inert, non-reactive or reactive liquid such as ammonia, hydrogen chloride, hydrogen bromide, and chlorine are reduced by at least a factor of 5 using liquid purifying systems that contain an ultra-low emission (ULE) c... | 09/14/2004 |
| 6758977 | Purification of phosphoric acid plant pond water A process for the partial purification of contaminated phosphoric acid plant pond water is described, in which the pond water is treated sequentially, with two basic compounds, clarified, aged, clarified again and re-acidified. The thus treated pond water, still con... | 07/06/2004 |
| 6652758 | Simultaneous ammonia and fluoride treatment for wastewater An improved method of treating wastewater to remove ammonia and fluoride is provided. The method comprises the steps of chemical destruction of ammonia with an oxidizing agent, followed by treatment with calcium salts to precipitate insoluble calcium fluo... | 11/25/2003 |
| 6645385 | System and method for removal of fluoride from wastewater using single fluoride sensing electrode A system for removing fluoride from wastewater is provided. The system comprises a reaction tank for processing said wastewater by adding calcium salts, a filtration tank for removing the precipitated fluoride formed in the reaction tank, a single fluorid... | 11/11/2003 |
| 6613230 | Method for simultaneous removal of arsenic and fluoride from aqueous solutions A method of removing arsenic and fluoride from aqueous solutions in the same process is provided. Specifically, the pH of the aqueous solution is adjusted to a pH in the range of about 5 to 8. A combination of calcium salts, and ferric or aluminum salts a... | 09/02/2003 |
| 6589494 | Process for eliminating halogen-containing compounds contained in a gas or liquid using an adsorbent composition based on at least one metallic element The present invention provides a process for eliminating halogen-containing compounds contained in a gas or a liquid, characterized in that the gas or liquid is brought into contact with a composition based on an alumina and/or a hydrated alumina and at l... | 07/08/2003 |
| 6572771 | Waste water treatment method An apparatus for treatment of fluorine waste water has an introduction tank, a main treatment tank, a calcium hydroxide tank, a polychlorinated aluminum tank, a macromolecular flocculant tank, a settling tank, and a concentration tank. Fluorine waste wate... | 06/03/2003 |
| 6547969 | Process for treating fluorine-containing waste solution A process and apparatus for treating a fluorine-containing waste solution that is able to maintain a high treatment volume while also facilitating easy maintenance. A calcium salt such as calcium hydroxide and an inorganic coagulant are added with timing ... | 04/15/2003 |
| 6464883 | Remover of fluoride ion and treatment method for wastewater containing fluoride ion using the same The present invention relates to a remover of dissolved fluoride ion for removing fluoride ions contained in wastewater and a treatment method for wastewater containing fluoride using the same. In order to achieve the above objects, the present invention ... | 10/15/2002 |
| 6464874 | Waste water treatment method and waste water treatment apparatus In the waste water treatment apparatus, organic matter-containing fluorine waste water is treated in a reaction tank into which biological sludge and calcium-containing chemical sludge are introduced, thus making it possible to treat organic matters in th... | 10/15/2002 |
| 6436297 | Defluoridation of waste water The present invention relates to a method of defluoridation of waste water, including a step of acid neutralization between a basic neutralization step and a decantation step.... | 08/20/2002 |
| 6413434 | Method for eliminating halogenated compounds contained in a gas or liquid The present invention concerns a process for eliminating, reducing and/or suppressing halogenated compounds, in particular chlorinated compounds, contained in a gas or a liquid, in which the gas or liquid is brought into contact with a composition obtaine... | 07/02/2002 |
| 6413417 | Waste water treatment apparatus An apparatus for treatment of fluorine waste water has an introduction tank, a main treatment tank, a calcium hydroxide tank, a polychlorinated aluminum tank, a macromolecular flocculant tank, a settling tank, and a concentration tank. Fluorine waste wate... | 07/02/2002 |
| 6383395 | Water treatment method and apparatus A media is used to remove species from aqueous solutions, particularly in the treatment of water to enable it to be suitable for drinking. The media includes a material selected from the group consisting of zirconium hydroxide, titanium hydroxide, hafnium... | 05/07/2002 |
| 6379548 | System for recovering and treating waste water This invention provides a compact effluent water reclamation apparatus which is minimized in the kinds and amounts of chemicals to be used for the recovery of water to thereby reduce the amount of waste and eliminate equipment which necessitates a large a... | 04/30/2002 |
| 6375837 | Waste water treatment method being able to treat surface active agent, nitrogen, hydrogen peroxide and phosphor with high efficiency and equipment therefor A waste water treatment equipment treats a fluorine waste water containing organic matter, nitrogen, phosphor and hydrogen peroxide by an anaerobic tank 3 in which a calcium carbonate mineral 9 is placed and an aerobic tank 15 in which the calcium carbona... | 04/23/2002 |
| 6344142 | Waste water treatment method and apparatus In a waste water treatment apparatus, sludge settled in a settling tank is treated by being introduced (returned) into a return sludge reaction tank having a settling section in its rear portion. Therefore, unreacted chemicals contained in the sludge that... | 02/05/2002 |
| 6331256 | Treatment process for fluorine-containing water Fluorine-containing water is treated by contacting the fluorine-containing water with calcium carbonate to react the fluorine in the fluorine-containing water with the calcium carbonate and fix it as calcium fluoride. After the fluorine-containing water i... | 12/18/2001 |
| 6296773 | Removal of boron and fluoride from water A process for reducing boron and/or fluoride ion content of water. Feed water is contacted, in the presence of magnesium, with an alkaline hydroxide to produce treated water and a magnesium precipitate containing boron and fluorine. The precipitate is sep... | 10/02/2001 |
| 6267892 | Fluoride including waste water processing device and method capable of processing fluoride including waste water to have low concentration of fluoride In a fluoride including waste water processing device which comprises a reaction vessel and a sedimentation vessel, a calcium compound adding device adds calcium compound in fluoride including waste water in the reaction vessel to react the calcium compou... | 07/31/2001 |
| 6261456 | Waste water treatment method and waste water treatment equipment capable of treating waste water containing fuluorine, nitrogen and organic matter Waste water containing fluorine, nitrogen and organic matter is treated by introducing the waste water into a water tank filled with calcium carbonate mineral and anaerobic microorganic sludge. An upper portion of the water tank is occupied by the anaerob... | 07/17/2001 |
| 6235203 | Crystallization process for removing fluoride from waste water The present invention provides a crystallization process for removing fluoride from waste water. Fluoride-containing waste water is introduced into a fluidized bed crystallizer provided with a carrier. A water soluble sodium reagent and a water soluble al... | 05/22/2001 |
| 6228267 | Waste water treatment method and equipment being able to economically treat both a waste water and an exhaust gas respectively containing fluorine and organic matter This waste water treatment equipment introduces granular calcium carbonate mineral 13, a calcium fluoride 14 in a floc form and a microorganism 15, which are flowing in a lower section 8, into an upper section 7 and sprinkles the same. Therefore, in the u... | 05/08/2001 |
| 6210589 | Process for removing fluoride from wastewater A process for removing fluoride from wastewater is presented. Calcium (or magnesium), sodium and aluminum reagents are added into a fluidized bed crystallizer to remove most of the fluoride in wastewater. The remaining fluoride is removed by aluminum hydr... | 04/03/2001 |
| 5951830 | Process for purification of hydrochlorofluoroethanes To remove the olefinic impurities from a hydrochlorofluoroethane of formula: CF3 --CHClX (X=H, F, or Cl), it is subjected to a photochlorination stage.... | 09/14/1999 |
| 5910251 | Wastewater treatment process and apparatus for high flow fluoride removal A process and system for removing heavy metals, fluoride, silica and other contaminants from large volumes of wastewater is disclosed. In the process, a wastewater stream containing the contaminant is treated with a chemical coagulant to create a particle... | 06/08/1999 |
| 5837149 | Method for hot and supercritical water oxidation of material with addition of specific reactants This invention relates to a process for the decomposition of material selected from the group consisting of organic compounds, inorganic compounds, or combinations thereof to compounds which are environmentally acceptable, or are amenable to further degra... | 11/17/1998 |
| 5824227 | Method for removing fluoride from water A process for removing dissolved fluorides from an aqueous stream using at least two reactors wherein the dissolved fluoride containing aqueous feed and an unreacted aluminum containing sludge are combined in the first reactor to give a first reactor admi... | 10/20/1998 |
| 5762807 | Composition and process for treating water and gas streams containing heavy metals and other pollutants A composition for treating water or flue gases that contains metal ions and possibly also organic and/or inorganic compounds is produced by reacting sulfur with an alkali- and/or alkaline earth metal hydroxide in the presence of water. The inventive compo... | 06/09/1998 |
| 5750033 | Method of treating waste water to remove harmful ion by coagulating sedimentation 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 separatin... | 05/12/1998 |
| 5746926 | Method for hydrothermal oxidation of halogenated organic compounds with addition of specific reactants This invention relates to a process for the decomposition of material selected from halogenated organic compounds, to compounds which are environmentally acceptable, or are amenable to further degradation by conventional disposal systems to produce enviro... | 05/05/1998 |
| 5702594 | Apparatus for treatment of waste water and/or exhaust gases containing fluorine and surface active agents A first reaction/adjustment tank has a lower portion containing a calcium carbonate mineral, an upper portion containing a calcium carbonate mineral and a plastic filler, and an air lift pump for circulating waste water from the lower portion to the upper... | 12/30/1997 |
