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| Number | Title | Issue Date |
| 4170552 | Method for coalescing mercury particles Mercury particles which are difficult to strip from sewage waters of industries employing mercury compounds, due to their extremely tiny size, can be coalesced into larger mercury drops by applying a strong magnetic field to the liquor which contains such... | 10/09/1979 |
| 4170554 | Wastewater treatment method A method of pollution abatement in the outflow of wastewater from a manufacturing plant or the like. A simultaneous precipitation of chromium and flouride contaminants is carried out with a subsequent removal of precipitates under conditions substantially... | 10/09/1979 |
| 4128477 | Method for the treatment of sea discharged sewage Disclosed herein is a method for treating sewage destined for discharge into the sea. The fluid treatment process comprises conducting the sewage through bar racks, and degritters to remove large scale particles, extracting intermediate size particulate m... | 12/05/1978 |
| 4124504 | Process for treating caustic wash solutions A process is disclosed for treating caustic wash solutions with permanganate ions such that a significant degree of chemical purification of the wash solutions is effected which correspondingly permits reuse of the wash solutions in cleaning metal article... | 11/07/1978 |
| 4123355 | Simultaneous treatment of SO2 containing stack gases and waste water A process for simultaneously removing sulfur dioxide from stack gases and the like and purifying waste water such as derived from domestic sewage in which a portion of the gas stream and a portion of the waste water, the latter containing dissolved iron a... | 10/31/1978 |
| 4108771 | Elimination of odors from organic wastes A method and solution are provided for reducing air-polluting odors emanating from organic waste products produced by metabolic processes and from organic industrial wastes, including effluents, sewage sludges, and the like, the method comprising contacti... | 08/22/1978 |
| 4097377 | Method of purification of waste water by treatment with zirconium salt The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, lo... | 06/27/1978 |
| 4072605 | Method of obtaining a precipitate of metallic ions from solutions containing low concentrations of metal salts A method and process for removal by precipitation of salts of a variety of metallic elements from aqueous solutions, including for example, copper, cadmium, chromium, zinc, nickel, lead, tin, platinum, rhodium and others with each of the metallic elements... | 02/07/1978 |
| 4071448 | Method for treatment of cyanide-containing waste water A method for treating a cyanide-containing waste water by mixing the waste water with a treating agent containing a carbonyl compound such as formaldehyde and subjecting said mixture to an elevated temperature in an atmosphere containing oxygen to evapora... | 01/31/1978 |
| 4069152 | Clarification of clay containing water Clay-containing water from processing of oil or bituminous sands or from oil or gas well drilling sites is clarified by treating the water with a sufficient amount of an alkali permanganate to effect adequate clarification. The water may also be treated w... | 01/17/1978 |
| 4059514 | Method for purification of industrial waste water A process is provided for treating industrial waste water wherein suspended material and cyanides which are ordinarily dissolved in the water are treated simultaneously to reduce the time of treatment and provide a more economical and effective treatment.... | 11/22/1977 |
| 4053399 | Method and system for waste treatment A method for waste treatment including the steps of and the associated apparatus for removing large solid waste from the influent raw sewage, transmitting the large solid waste to an incinerator, subjecting the resultant liquor to centrifuging to separate... | 10/11/1977 |
| 4051027 | Settling clay-containing slimes The settling of finely-divided solids that are in suspension in an aqueous medium due to the presence of a colloidal argillaceous mineral is enhanced by adding a small but effective amount of hydrogen peroxide to the suspension. This invention is especial... | 09/27/1977 |
| 4049552 | Ozone generating system A housing has an interior casing receiving a coolant. This casing is associated with a forced cooling system and has open ended tubular portions therethrough formed of electrically conducting metal. Glass ozone generating tubes are removably supported in ... | 09/20/1977 |
| 4048283 | Removal of heavy metals from aqueous solutions Aqueous process streams or waste waters destined for merging with public waters sometimes contain deleterious amounts of heavy metals, e.g., lead (Pb) compounds. The heavy metal compounds may be substantially removed or reduced to harmless levels by treat... | 09/13/1977 |
| 4032293 | Preparation of stable strong base cellulosic anion exchangers with red-ox potentials Strong base quaternary ammonium cellulose derivatives prepared under anhydrous conditions are further chemically modified in selected organic solvents by a sequential process that produces a partial cellulose ether in fibrous form that can be used in elec... | 06/28/1977 |
| 4028236 | Recovery of mercury Mercury present in liquid effluents, for example, the effluent from a caustic-chlorine plant using a flowing mercury cathode, is removed by first converting the mercury to a metallic or soluble form and thereafter contacting the solution with tin-coated i... | 06/07/1977 |
| 4015971 | Method of producing fertilizers from sea-like waters A method of producing fertilizers from sea-type waters comprising introducing, into said water, bivalent iron ions in an amount ranging from 10 to 100 mg per liter of water at a pH of from 5 to 9. The resulting iron hydroxide sorbs microelements and organ... | 04/05/1977 |
| 4000068 | Polluted water purification Organically polluted waters are purified by contacting such waters with a water soluble copper salt catalyst in the liquid phase under oxidizing conditions. In one embodiment, an aqueous stream obtained from the effluent of an oxidative dehydrogenation pr... | 12/28/1976 |
| 3997439 | Method of purification of waste water by treatment with zirconium salt The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, lo... | 12/14/1976 |
| 3975266 | Dewatering process A dewatering process for the separation and recovery of sludge from water reservoirs, such as, lakes, ponds, lagoons, rivers and the like is provided. The process includes the steps of dredging the reservoir, thickening the suspended matter in the water, ... | 08/17/1976 |
| 3959097 | Selenium rejection during acid leaching of matte A method is provided for removing trace amounts of selenium from acid leach solutions containing over 2 ppm of total selenium comprising either Se(IV) and/or Se(VI) obtained during the pressure oxidation leaching of metal sulfide concentrate comprising fo... | 05/25/1976 |
| 3931007 | Method of extracting heavy metals from industrial waste waters A method is provided for extracting metal impurities from waste water to which ferrous ions are added to provide at least two times the amount of ferrous ions on the mol basis to the amount of metal ions present, the resulting solution containing acid rad... | 01/06/1976 |
