Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 4719019 | Treatment of thiocyanate containing waste liquor A process is described for the treatment of waste liquor containing a mixture of alkali metal or ammonium thiocyanate and polysulfides to convert the latter to the corresponding sulfates. The waste liquor is admixed with concentrated sulfuric acid under t... | 01/12/1988 |
| 4693832 | Preparation of safe drinking water A disinfection process is provided for preparing potable water having an unusually persistent and long lasting free available chlorine residual in order to assure safety and integrity of said water during its passage through the distribution system by whi... | 09/15/1987 |
| 4678586 | Treatment of wash water in paint spray booths To control build-up of paint in the water tank an alkaline liquid containing NaOH is added in quantities to maintain a pH not substantially less than 9, thus preventing corrosion, and a hydroxide ion concentration not exceeding 0.01M. The additive is intr... | 07/07/1987 |
| 4652382 | Process and apparatus for continuously treating sewage wastewater by chemical oxidation An improved process and apparatus for continuously treating sewage wastewater by chemical oxidation of the contaminates and characterized by a high degree of oxygen absorption and utilization. An enclosed vessel continuously receives liquid wastewater at ... | 03/24/1987 |
| 4632766 | Method of treatment of waste water obtained in a gasification plant during washing of raw gas In a method of treating waste water obtained in a direct washing with water of raw gas in a plant for a gasification of gas, the waste water is first settled in a settling tank and a resultant concentrated slime-containing water is subjected to a multi-st... | 12/30/1986 |
| 4612124 | Method of sewage treatment The present invention discloses a method of sewage effluent treatment comprising oxidizing sewage effluent by reacting hydrogen peroxide with a catalyst selected from the group consisting of potassium iodide and potassium hydroxide, while in communication... | 09/16/1986 |
| 4591443 | Method for decontaminating a permeable subterranean formation The present invention is a process to oxidize a contaminant in a permeable subterranean formation by introducing an aqueous treating solution into the formation which solution contains hydrogen peroxide and a compound to control the mobility of the aqueou... | 05/27/1986 |
| 4588506 | Stimulation of biooxidation processes in subterranean formations The present invention is a process to stimulate the biooxidation of a contaminant in a subterranean formation by introducing an aqueous solution into the formation. The concentration of the hydrogen peroxide is increased thereby acclimating the biota to h... | 05/13/1986 |
| 4555347 | Iodine disinfection dispenser A method of, and a device for, providing a disinfectant carried by a water supply flowing through a conduit, comprising introducing a predetermined portion of the water into a sealed container having a reservoir and a chamber below the reservoir in interc... | 11/26/1985 |
| 4554078 | Methods of and apparatus for effluent disposal An open end (61) of a tube (62) is disposed below a free surface of a treating solution (60) which is capable of reacting with a liquid effluent to provide a disposable reaction product. A pressurized gas which is non-reactive with the effluent and with t... | 11/19/1985 |
| 4508683 | Control of cyanides in FCC reactor by injection of ammonium polysulfide The concentration of cyanides in the sour water system of FCC reactor is controlled by injecting such an amount of ammonium polysulfide (APS) into the system that the weight ratio of net free sulfur to simple cyanides in the sour water is about 0.6 to abo... | 04/02/1985 |
| 4500428 | Method for the treatment of wastewater sludge According to an embodiment thereof, the method comprises using a pair of reaction vessels, sequentially, to treat the sludge. Both vessels are pressurized, and the first thereof has an aerator for aerating the sludge, and receives sulfuric acid and chlori... | 02/19/1985 |
| 4482462 | Mechanical devices for chemical treatment of fluids A device for treating a process fluid contained within a closed chamber with a chemical reactant including a compartment for containing the chemical reactant and a port for allowing flow of the process fluid therethrough. The device is characterized by a ... | 11/13/1984 |
| 4456535 | Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions An improved process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions thereof by hydrolyzing the urea, and thereafter desorbing ammonia and carbon dioxide. The dilute solution containing urea is passed into the top portion... | 06/26/1984 |
| 4364835 | Sulfite destruction of direct acting mutagens in drinking water A method of reducing the activity of non-volatile mutagens, in chlorinated water, such as chlorinated drinking water and municipal and industrial waste water, by sulfite treatment. The chlorinated water is treated with a stoichiometric excess of sulfur di... | 12/21/1982 |
| 4357243 | Metal-working emulsion reclaiming process A method for reclaiming an aqueous emulsion useful as a metal-working lubricant/coolant which is contaminated with particles of at least one metal comprises contacting the contaminated emulsion with at least one metal solubilizing agent at metal solubiliz... | 11/02/1982 |
| 4341640 | Urea hydrolysis The process for the purification of urea containing waste streams is improved by conducting the purification in a vessel having at least one treating zone wherein the urea containing waste stream is both hydrolyzed and stripped of the products of the urea... | 07/27/1982 |
| 4329234 | Multi-stage gas liquid reactor A multi-stage gas/liquid reactor is disclosed which has several concentric internal baffles, which define reaction stage zones. A central liquid inlet and an array of gas inlets supply the reactants which flow sequentially through diametrically opposed ba... | 05/11/1982 |
| 4317733 | Water purification equipment There is described a device comprising a filtering compartment enclosing a filtering body, an inlet for unfiltered water and an outlet for filtered water, said inlet being preceded by a liquid-receiving compartment which communicates with a container cont... | 03/02/1982 |
| 4302338 | Apparatus for metering and/or distributing liquid media Apparatus for metering and/or distributing liquid media comprising a substantially horizontal manifold and a plurality of generally vertical discharge conduits which depend from said manifold, said discharge conduits comprising discharge tubes which are o... | 11/24/1981 |
| 4278546 | Treatment of a liquid by circulation and gas contacting Process and apparatus for treating waste water by circulating it, together with oxygen-containing gas, through communicating downflow and upflow pipes enclosed in a treatment chamber, the pipes being open at their bottom ends, and controlling the flow of ... | 07/14/1981 |
| 4272383 | Method and apparatus for effecting subsurface, controlled, accelerated chemical reactions A method and apparatus is disclosed for effecting accelerated chemical reactions between reactants at elevated temperatures and pressures including the wet oxidation of materials in waste streams. A reactor has a through pipe that extends down into a case... | 06/09/1981 |
| 4160725 | Waste water purification processes Waste water from coke ovens is purified by passing the waste water and a stripping fluid through a stripping column in counterflow. Non-volatile ammonium compounds are removed in one region of the column, phenolic compounds are removed in another region, ... | 07/10/1979 |
| 4156648 | Flotation device with pretreatment Methods and apparatus for treating water/wastewater to remove grit, susped and colloidal solids of organic and inorganic nature, microorganisms and surfactants. Dense suspended solids (grit) are first removed by a centrifugation process. The influent wat... | 05/29/1979 |
| 4054518 | Apparatus and methods for sanitizing sewage effluent and compositions for use therein Apparatus and methods for sanitizing sewage effluent comprising supporting a plurality of solid members in a conduit in fluid-flow intercepting relationship to sewage effluent flowing therethrough, the said solid members being soluble in the effluent to r... | 10/18/1977 |
| 4053403 | Method of treating and degerminating bath water, particularly bath water contaminated by the germ bact. pseudomonas pyocanea, in medical tub-baths and underwater massage baths A bath water treating system in which even highly resistant germs may be destroyed by treating the bath water with ozone and a halogen compound such as bromine or hydrobromic acid to establish a redox potential in excess of 600 mV. The bath water is recyc... | 10/11/1977 |
| 3998714 | System for pollution suppression The present invention relates to a two stage oxidative system for the disinfection of material which may contain nitrogen commonly in the form of ammonia or ammonium as in the treatment of waste or sewage plant effluent by adding a primary oxidizing agent... | 12/21/1976 |
| 3951795 | Process and apparatus for treating fatty waste water A system for cleanup of waste waters of the type characteristically produced in food-processing operations. Such waste waters typically contain significant amounts of fat and grease materials of animal and plant origin together with other contaminants. Su... | 04/20/1976 |
