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| Number | Title | Issue Date |
| 7442314 | Wet oxidation method A method for wet oxidation of organic material, characterized by the utilization of the heat generated by the oxidation of the pollutants that are present in a first preheated wastewater introduced at the base of the reactor in order to provide the energy sufficient... | 10/28/2008 |
| 7422680 | Animal waste effluent treatment system Animal waste such as fecal material from swine, chicken, turkey, and cattle is converted into useful forms such as fertilizer, other types of soil builders, and even nutrient feed additives. Devices, systems, and methods are provided that allow economical conversion... | 09/09/2008 |
| 7351343 | Copper metal recovery system The present invention generally relates to a copper metal recovery system, able to integrate with a waste treatment system of a circuit board manufacture plant, includes a stirring unit, a crystallization unit and a pressure filtering unit. More than 2 parts of weig... | 04/01/2008 |
| 7344650 | Process for the working-up of waste waters containing aromatic nitro compounds Alkaline waste waters formed in the washing of crude nitrobenzene which has been prepared by the adiabatic nitration of benzene with nitrating acid, washed in an acidic washing process, and then washed in an alkaline washing process are treated. The alkaline waste w... | 03/18/2008 |
| 7238283 | System for wastewater treatment A new and improved wastewater treatment system suitable for the treatment of wastewater from a CMP process. A holding tank receives wastewater from a CMP wastewater collection tank. The holding tank may further receive wastewater from a backside grinding (BG) wastew... | 07/03/2007 |
| 7112281 | Underdrain for filtration membrane A device and method for removal of liquid from the downstream side of a membrane or a well, such as a well of a multiwell plate. More specifically, the present invention is directed to a wicking structure, which channels droplets of liquid away from a membrane in co... | 09/26/2006 |
| 6989099 | Underdrain for filtration membrane A device and method for removal of liquid from the downstream side of a membrane or a well, such as a well of a multiwell plate. More specifically, the present invention is directed to a wicking structure, which channels droplets of liquid away from a membrane in co... | 01/24/2006 |
| 6932909 | Method of treating mine drainage A method of treating mine drainage water including the step of adding a scale control agent to the mine drainage water and, optionally, adding an oxidizing agent to the mine drainage water and/or precipitating and settling the metals in their hydroxide form from the... | 08/23/2005 |
| 6893562 | Underdrain for filtration membrane A device and method for removal of liquid from the downstream side of a membrane or a well, such as a well of a multiwell plate. More specifically, the present invention is directed to a wicking structure, which channels droplets of liquid away from a membrane in co... | 05/17/2005 |
| 6887389 | Method and apparatus for recycling sewage sludge utilizing spent water-softener lime A method and apparatus are disclosed for mixing sewage sludge with spent water-softener lime in a ratio of approximately 10:1 on a wet basis. The mixture is introduced to a rotary pre-dryer kiln and a rotary combuster kiln to kill pathogens. An ash by-product and ga... | 05/03/2005 |
| 6824687 | Extraction of phenol from wastewater A method is provided herein for the extraction of phenol from a waste water stream. The method is used in conjunction with a process for producing acetone and phenol from cumene. The method for extracting phenol from waste water includes contacting in a countercurre... | 11/30/2004 |
| 6821445 | Rainwater-treating apparatus in combined sewer system and backwashing method therefor The present invention is aimed at treating rainwater in a combined sewer system, while enabling removal of a majority of pollution substances even if a large amount of entering rainwater. The invention relates to a rainwater-treating apparatus in a combined sewer sy... | 11/23/2004 |
| 6589427 | Process for treatment of mixture of spent wash from distillery and black liquor from pulp and paper industry This invention relates to a process for treating an effluent comprising a mixture of spent wash and black liquor, said process comprising mixing the effluent with a flocculating agent consisting of a mixture of salts of Group III and transition metals, mi... | 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 |
| 6562236 | Sewage treatment system A source of sewage is coupled to a septic tank by an influent line. The outlet line is coupled to a sewage treatment plant by an outlet line. Sewage travels from the source to the septic tank where solid matter is filtered. Liquid matter passes through th... | 05/13/2003 |
| 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 |
| 6409927 | Process for the treatment of polluted metal-mechanic industrial wastewater and urban water Process for the treatment of polluted metal-mechanic industrial waste water and urban water, comprising: treating the polluted water with an acid liquor including ferrous chloride and hydrochloric acid, in order to promote the denaturalization of protein ... | 06/25/2002 |
| 6299783 | Process for cleaning up wastewaters from the hock process A process for reducing the loading of wastewaters produced in the preparation of hydroxyl and carbonyl compounds from hydroperoxides by the Hock process, which may be acidic, by treating the wastewaters with an oxygen-containing gas at a pressure greater ... | 10/09/2001 |
| 6277290 | Process for recovering silver from photographic solutions Silver recovery from a silver-bearing spent photographic solution is achieved by reducing the silver ions to silver metal with an organic reducing agent, especially a photographic developer reagent; in particular a spent photographic developer solution pr... | 08/21/2001 |
| 6270677 | Alkaline effluent solution treating process A process for treating alkaline solutions obtained from lithographic printing plate processing comprises admixing at least one alkaline solution and at least one acidic solution in the presence of at least one aqueous solution to obtain a discharge soluti... | 08/07/2001 |
| 6171499 | Optimised method for the treatment and energetic upgrading of urban and industrial sludge purifying plants The invention concerns an optimized method for the treatment and energetic upgrading of urban and industrial sewage sludge. It consists of a combination of known and tested equipment, forming a compact assembly with six functions which are: anae... | 01/09/2001 |
| 6165371 | Off-shore sewage treating and handling apparatus and method Apparatus and method for accommodating and handling excess deliveries of combined sewage overflows to a sewage treatment plant supported and contained within an offshore moored vessel or platform, by diverting the excess deliveries to ballast tanks for te... | 12/26/2000 |
| 6132600 | Filtration and treatment system A materials treatment system which initially separates liquid and solid components with a separator. The system can be advantageously utilized for household sewage handling, however various components have other applications. Once the separator separates ... | 10/17/2000 |
| 6123856 | Dewatering of sludges 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 bei... | 09/26/2000 |
| 6077444 | Method for manufacturing a system for treating water A method of manufacturing a water treatment system for providing a flow of treated water having a pre-established quality, for example, a maximum TDS and permitted pH range, from a flow of reclaimed water having a quality poorer than the pre-established q... | 06/20/2000 |
| 6033576 | Chemical waste treatment A method for accelerating the treatment of chemical wastes, particularly recalcitrant wastes such as spent caustic, from the oil, gas, chemical, and petrochemical industries, in which normally slow physical mass transfer of different fluid phases, as well... | 03/07/2000 |
| 5976387 | Method for feeding wastes into a boiler A waste containing organic solids is fed into a boiler after it has been subjected to a hydrothermal reaction treatment in the presence of water. A slurry containing the waste is held under high-temperature and high-pressure conditions to cause a hydrothe... | 11/02/1999 |
| 5961837 | Process for treatment of industrial waste Water to be utilized is reacted with soda ash and lime to produce a less corrosive and foulant water. Reaction sludges are fed to a desulfurization unit, where SOx, NOx and CO2 abatement occurs; other industrial waste slud... | 10/05/1999 |
| 5702615 | Method for the treatment of waste water A method for the treatment of waste water, which comprises treating waste water containing at least a sulfide-type malodorous substance, in the presence of a transition metal compound and hydrogen peroxide or a hydrogen peroxide-forming compound, wherein ... | 12/30/1997 |
| 5683587 | Process for treating industrial wastes Water to be utilized is reacted with soda ash and lime to produce a less corrosive and foulant water. Reaction sludges are fed to a desulfurization unit, where SOx, NOx and CO2 abatement occurs; other industrial waste slud... | 11/04/1997 |
| 5639347 | Method of controlling of metals in a bleach plant, using oxidation A method and apparatus facilitate removal of metals from acidic liquids containing dissolved metals (such as pulp mill bleach plant washer filtrate) by oxidizing the liquid with ozone, hydrogen peroxide, oxygen, and/or air to increase the valence of the m... | 06/17/1997 |
| 5632885 | Hydrogen peroxide removal equipment capable of treating both waste water and waste gas There is provided a hydrogen peroxide removal equipment which has a high capability for removing hydrogen peroxide and is able to cope with variation in amount of a hydrogen peroxide containing waste water and variation of a hydrogen peroxide concentratio... | 05/27/1997 |
| 5616251 | Methods to prevent and treat acid mine drainage and to remove metals and non-metals from aqueous sources The present invention is directed to the use of water-soluble compositions containing a compound having a Lewis base group attached to a hydrophobic group where the Lewis base group is capable of donating at least one lone pair of electrons to a metal. Th... | 04/01/1997 |
| 5614102 | Method for purifying sewage A sewage purification method which includes a first step in which at least two kinds of flocculants are introduced in sewage for stirring and mixing therewith so as to float and settle inorganic and organic materials. The first step is sequentially repeat... | 03/25/1997 |
| 5567325 | Thermophilic digestion of chitin-containing waste Processes are provided for the thermophilic digestion (55° C. to 65° C.) of chitinous wastes to produce a solubilized form of chitin that may be applied to plants to stimulate their resistance to disease and attack by insects and fungi. Also provided ar... | 10/22/1996 |
| 5529697 | Process for color removal from paper mill wastewaters 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 stre... | 06/25/1996 |
| 5509999 | Treatment of bleach plant effluents The removal of bleaching chemical-consuming metals from treatment fluids in a cellulose pulp mill is facilitated by treating the pulp in an acidic or neutral stage to dissolve metals, washing or thickening the pulp to produce a filtrate containing dissolv... | 04/23/1996 |
| 5478472 | Process for treating waste water containing organic and inorganic compounds A method for treating waste water which contains organic and inorganic compounds, particularly waste water from the synthesis of epichlorohydrins, in which the waste water is subjected to a) thermal-alkaline treatment, b) biological treatment, and c) optionall... | 12/26/1995 |
| 5462668 | Use of steam to condensate to dilute brine stream additives Additives are usually diluted before they are added to a geothermal brine processing stream. It has been found that one preferred diluent is the conditioned steam condensate produced after power generation in the geothermal plants. One class of additives ... | 10/31/1995 |
| 5316589 | Method for controlling street surface pollutants A method for collecting and treating small particulate pollutants typically found on the surface of streets in areas where the storm sewer and sanitary sewer are maintained separately. The method includes temporarily isolating a portion of the storm sewer... | 05/31/1994 |
