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| Number | Title | Issue Date |
| 4409119 | Process for regenerating cleaning solutions Process for regenerating alkaline and neutral phosphate and/or silicate-containing degreasing and cleaning solutions which are contaminated with emulsified mineral and/or natural oils, by treating such contaminated solutions with a controlled quantity of ... | 10/11/1983 |
| 4402833 | Waste water treatment system for elemental phosphorous removal An environmentally sound system for the removal of elemental phosphorus from waste water resulting from phosphorus manufacture, use, conversion to other products, and storage, wherein the waste water is treated with a material such as lime that produces a... | 09/06/1983 |
| 4399037 | Process for working up waste water containing phosphorus The invention relates to a process for working up phosphorus-containing waste water by subjecting it to filtration with the use of a filter aid in a centrifugal filter. To this end, waste water with a temperature of at least 46° C. and a pH-value within ... | 08/16/1983 |
| 4391887 | Preparations of micro-organisms A process for the production of a storage-stable preparation of micro-organisms, starting from a mixed culture of micro-organisms, which is capable to degrade products of industrial organic syntheses, which comprises that the culture conditions of an acti... | 07/05/1983 |
| 4389317 | Process for chemical reduction of the phosphate content of water Heterogenous nucleation on a seed material is promoted in the removal of phosphate from water by contacting the water with the seed material in a bed of grains of the seed material which bed is fluidized and kept in fluidization by the water stream itself... | 06/21/1983 |
| 4383847 | Production of fluid fertilizer from phosphorus furnace waste stream A process and product of waste recovery at phosphorus furnaces is disclosed wherein small sized discrete particles of carbonaceous material or beneficiated phosphate ore are mixed with a mineral axis, an alkaline fluid and water, and the reacted mixture i... | 05/17/1983 |
| 4374810 | Recovery of fluorine from pond water of wet process phosphoric acid plants and recycling of defluorinated water A process for obtaining calcium fluoride from the pond water of phosphoric acid plants and recycling the high phosphate defluorinated water to the pond is disclosed. Sufficient calcium carbonate is added to a solution having a pH of about 0.8, containing ... | 02/22/1983 |
| 4331538 | Method for building up defined phosphate deposits from waste phosphates For simultaneous elimination and fixation of phosphates from phosphate burdened aqueous liquids like sewage water a deposit space is formed by a soil matrix containing iron and/or aluminum. The soil matrix is defined by layers of poor hydraulic conductivi... | 05/25/1982 |
| 4320012 | Neutralization of phosphoric acid waste waters Method for neutralizing waste cooling pond waters of wet process phosphoric acid plants, and for neutralizing similar waste waters from phosphate complexes, wherein neutralization is performed in two stages and wherein the flocculent precipitate from the ... | 03/16/1982 |
| 4301014 | Phosphorus pentasulfide waste water treatment The process disclosed in this invention takes the waste solids, gases, and water from a phosphorus pentasulfide manufacturing facility and hydrolyzes the phosphorus pentasulfide by heating. The phosphorus portion is converted to a soluble phosphate and th... | 11/17/1981 |
| 4284515 | Process for decreasing elemental phosphorus levels in an aqueous medium A process is provided for decreasing elemental phosphorus levels in an aqueous medium containing elemental phosphorus. Preferably, the elemental phosphorus levels are at about 10 ppm or less. The process comprises adding to the aqueous medium an effective... | 08/18/1981 |
| 4277343 | Method for continuously monitoring and controlling alkalinity for environmental purposes using a pCO2 probe A novel method for continuously monitoring and controlling the total alkalinity attributable to carbon dioxide, bicarbonate ion and carbonate ion such as is found in water and waste water treatment systems and in cooling towers. This method includes the s... | 07/07/1981 |
| 4271026 | Control of activated sludge wastewater treating process for enhanced phosphorous removal An improved method of operating an activated biomass process wherein influent and activated biomass are initially contacted under anaerobic conditions to form a mixed liquor, the mixed liquor is subsequently oxygenated, thereafter activated biomass is sep... | 06/02/1981 |
| 4267058 | Precipitating agent for dephosphatizing effluent A precipitating agent for the dephosphatization of effluent comprising by weight about 5 to 75% of active iron (III) sulphate, about 25 to 95% of active iron (III) oxide and 0 to about 10% of anhydrous magnesium sulphate. Optionally, an alkaline constitue... | 05/12/1981 |
| 4257897 | Process for reabsorption and retention of phosphorous by activated biomass A process for promoting the reabsorption and retention by an activated biomass of phosphorous values previously contained by the biomass and released under anaerobic conditions, which process requires initially subjecting the biomass in admixture with a l... | 03/24/1981 |
| 4246104 | Pressure-hydrolytic treatment of effluent A process for the chemical treatment of an effluent containing at least one organic compound selected from the group consisting of an organometallic compound and an organic compound containing at least one of phosphorus, nitrogen and halogen, comprising t... | 01/20/1981 |
| 4220527 | Method of cleaning phosphorus-containing waste water by microorganisms A method of cleaning phosphorus-containing waste water by utilizing microorganisms which are capable of accumulating efficiently organic and inorganic phosphorus compounds in themselves. Such microorganisms are found to belong to the Arthrobacter, Microco... | 09/02/1980 |
| 4201667 | Process for removing arsenic from aqueous mediums A process for removing arsenic from aqueous mediums by adding, in the presence of phosphorus, sufficient calcium hydroxide to adjust the aqueous medium to a pH of from about 7.0 to 11.5, whereby precipitates of both arsenic and phosphorus are formed and a... | 05/06/1980 |
| 4183808 | Phosphate removal from wastewater In activated sludge-type wastewater treatment in which phosphate is taken up in the aeration zone, solids are concentrated in a separate zone to form phosphate-enriched sludge and phosphate is resolubilized in an anoxic zone, a major part of the latter is... | 01/15/1980 |
| 4173531 | Nitrification-denitrification of wastewater In activated sludge-type wastewater treatment, nitrified oxygenated liquid-solid from the oxic zone is retained under anoxic conditions for denitrification and release of nitrogen gas, and the denitrified liquid-solid returned to the oxic zone.... | 11/06/1979 |
| 4171342 | Recovery of calcium fluoride from phosphate operation waste water Calcium fluoride is produced from pond waters resulting from phosphoric acid processing by treating the pond waters with calcium carbonate and/or calcium oxide in two stages to precipitate out the major part of the fluorine values from the waters as calci... | 10/16/1979 |
| 4167479 | Process for purifying waste waters A purification process for the removal of biodegradable suspended and dissolved organic solids, nitrogenous compounds and phosphates from contaminated water by biological and chemical reactions carried out simultaneously in active media of a biological wa... | 09/11/1979 |
| 4162153 | High nitrogen and phosphorous content biomass produced by treatment of a BOD-containing material An organic product material having a high nitrogen and phosphorous content is produced as the product of a biological system for the treatment of a BOD-containing influent which also contains phosphorous and fixed nitrogen. The biological treatment system... | 07/24/1979 |
| 4160724 | Waste water treatment Removal of nitrogenous and carbonaceous contaminants is carried out in a single sludge two-tank system by a symbiotic two-step process whereby the second tank mainly oxidizes ammonia to nitrate and the first tank mainly reduces nitrate to nitrogen gas. Th... | 07/10/1979 |
| 4141822 | Phosphate stripping of sewage Activated sludge sewage treatment process comprising aerating a mixed liquor comprising phosphate-containing influent sewage material to cause the microorganisms present to take up phosphate, separating phosphate-enriched sludge from the mixed liquor, and... | 02/27/1979 |
| 4056465 | Production of non-bulking activated sludge A modified activated sludge system is provided wherein BOD-containing wastewater and recycled sludge are initially admixed under anaerobic conditions in the substantial absence of oxygen or oxidizing agents and subsequently subjected to aeration and clari... | 11/01/1977 |
| 4043910 | Removal of phosphorous from waste water Phosphate is removed from an aqueous medium by adding inorganic coagulant followed by a cationic polyelectrolyte which is a water-soluble quaternary ammonium salt of a high molecular weight copolymer of acrylamide and an alkylaminoalkyl ester of acrylic o... | 08/23/1977 |
| 4042493 | Phosphate removal from BOD-containing wastewater Activated sludge wastewater treatment process for removing phosphate from BOD-containing wastewater in which phosphate-enriched sludge formed in the aeration zone is settled in a phosphate stripping zone under anaerobic conditions to cause release of phos... | 08/16/1977 |
| 4029575 | Phosphorus removal from waste water A process and apparatus for decreasing the phosphorus content of waste water by means of contacting the waste water with the products of aqueous reaction with elemental iron, preferably subjecting the mixture to sequential aerobic and anaerobic conditions... | 06/14/1977 |
| 4017388 | Split treatment phosphorus removal from waste A process and apparatus for economically removing algae producing phosphorus, from sewage by separating sludge from the sewage, recirculating the sludge, mixing into this the lime needed to bring the pH up to 11.0 or more and then mixing the limed sludge ... | 04/12/1977 |
| 4011156 | Method for eliminating organic and inorganic bound nitrogen from domestic and industrial waste water A method of eliminating organic and inorganic bound nitrogen from domestic and industrial waste water in a biological waste water treatment plant consisting of two in series connected stages each containing an aeration tank and a subsequently connected se... | 03/08/1977 |
| 4008159 | Renovation of waste water A waste water treatment system for the renovation of waste water includes a four stage treatment for removal of gross solids, suspended, colloidal and dissolved organic matter, dissolved nitrogenous material, phosphates odor, color, coliform and residual ... | 02/15/1977 |
| 3985648 | Method and system for purifying liquid A method and system combining filtration and ion-exchange structures for removing contaminants from liquids. In overall concept, contaminated liquid is passed through filtering mediums to remove particulate matter from the incoming contaminated liquid. Or... | 10/12/1976 |
| 3984313 | Preferential removal of ammonia and phosphates Sewage water containing many pollutants including ammonia and phosphates is treated so that the ammonia and phosphates are preferentially removed through ion exchange while the other contaminants are allowed to remain in the water. Ferric hydroxide is dep... | 10/05/1976 |
| 3983033 | Process for removing dissolved phosphorus from water magnetically A process wherein an aqueous solution containing dissolved phosphorus is seeded with iron oxide and a clay additive, if necessary, and with the electrolyte cation Al+.sup.3, the latter acting to associate the dissolved phosphate with the iron o... | 09/28/1976 |
| 3980557 | Phosphorus removal from wastewater Disclosed are methods and materials, involving the microorganism Acinetobacter phosphadevorus (NRRL B-8058), useful in the removal of phosphorus from waste water.... | 09/14/1976 |
| 3971707 | Oxidation of phosphorus in aqueous medium Elemental phosphorus in electrothermal phosphorus plant effluents is oxidized either by anodically produced atomic oxygen or by an anodically produced mixture of atomic chlorine and atomic oxygen. The elemental phosphorus content of the effluents may be l... | 07/27/1976 |
| 3964998 | Improvements in and relating to waste water treatment A process for removing nitrogen from raw or settled sewage, comprising passing the sewage through a first stage in the form of an anoxic biological denitrification stage, through a second stage in the form of an aerated biological nitrification stage, thr... | 06/22/1976 |
