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| Number | Title | Issue Date |
| 7175683 | Process for transforming sludge into NPK type granulated fertilizer A process for transforming sludge into npk type granulated fertilizer in which the energy consume is reduced a 90% thanks to the addition of a special filtration step in which the water content is reduced a 50% and the remaining water is evaporated by the exothermic... | 02/13/2007 |
| 7135116 | Process for recovery of nutrients from wastewater The present invention relates to a process for treating a wastewater comprising an ammonium ion species and a phosphorus ion species. The process comprises the steps of: (i) treating the effluent in a first stage of the process to convert the phosphorus to a phospho... | 11/14/2006 |
| 6830696 | Treatment of spent pulping liquor with lignin separation to recover alkali pulping chemicals in manufacture of paper pulp A method of treating spent alkaline pulping liquor (black liquor) includes the steps of providing black liquor containing lignin, and acidulating a phosphate containing material, wherein phosphoric acid is generated by the acidulating step. The black liquor is mixed... | 12/14/2004 |
| 6569342 | Process for treating waters, soils, sediments and/or silts A method is providing for treating waters, such as standing and flowing waters and waste waters, soils, sediments and/or silts. At least one alkaline earth metal peroxide is brought into contact with such waters or the like, especially to effect immobiliz... | 05/27/2003 |
| 6506805 | Magnesium ammonium phosphate hexahydrate and monohydrate slurries A magnesium ammonium phosphate slurry and method of producing magnesium ammonium phosphate slurries. The method provides for obtaining a magnesium hydroxide supply having a small particle size of about 2 microns. Aqua ammonia and phosphoric acid are seque... | 01/14/2003 |
| 6476082 | Magnesium ammonium phosphate hexahydrate slurry A magnesium ammonium phosphate slurry and method of producing magnesium ammonium phosphate slurries. The method provides for obtaining a magnesium hydroxide supply having a small particle size of about 1 to 2 microns. Aqua ammonia and phosphoric acid are ... | 11/05/2002 |
| 5192428 | Portable system for treating human waste A new portable system is disclosed for composting feces and for treating urine includes a composting retainer which includes a composting means for exposing the feces to sufficient air and water to allow the feces to compost, thereby forming a compost pro... | 03/09/1993 |
| 5028252 | Method of and composition for the fertilization, detoxification and deacidification of soil A fertilizer composition and method for the detoxification and deacidification of soil threatened by acidic deposits which comprises at least one alkali-reactive component, selected from the group which consists of calcium, magnesium, potassium, sodium, a... | 07/02/1991 |
| 5019148 | Homogeneous mineral granules by acid-base reaction A stepwise method of preparing homogeneous mineral granules for agriculture by coreaction of commodity acids and bases which have properties to chemically form a transient fluid adhesive which will harden to form a strong granule binding cement. Water may... | 05/28/1991 |
| 4792349 | Fertilizer values from galvanizer waste The present invention teaches a technique and provides for apparatus eminently useful for the econimic recovery of Fe, Zn, and S from waste galvinizer sulfuric acid and crystals of iron sulfate and zinc sulfate. The technique or method of the instant inve... | 12/20/1988 |
| 4650682 | Acidifier-ammoniator Apparatus and process for chemically treating particulate solids material in free flowing condition with fluid reactants in a drum reactor having an acidifying chamber in which acid is introduced into the solids material and an ammoniation chamber in whic... | 03/17/1987 |
| 4427432 | Clarification of black ammonium polyphosphate liquids--recycling of byproduct "tops" The process allows essentially all of the nitrogen and P2 O5 values in the treated black ammonium polyphosphate liquid to be recovered in the form of valuable clarified product. In the process, a heel of black liquid fertilizer is fi... | 01/24/1984 |
| 4331465 | Process for the production of NPK fertilizers resistant to smoldering decomposition at elevated temperatures The invention relates to a method of preventing smoldering decomposition of multiple-nutrient fertilizers containing ammonium nitrate at elevated temperatures by treatment of the granulated, dried and screened fertilizer with ammonia.... | 05/25/1982 |
| 4279635 | Process for treating phosphatic clay suspensions A process for treating thickened phosphatic clay suspensions produced in the processing of phosphate ore by water beneficiation, and which have a solids content of from about 5% to about 30%. A deflocculating agent is mixed with the suspension to cause de... | 07/21/1981 |
| 4248617 | Process for producing granular basic phosphate fertilizer This invention relates to a process for producing a granular phosphate fertilizer by reacting and granulating simultaneously a mixture of a basic material which contains acid-soluble CaO and acid-soluble MgO, and also acid-soluble SiO2, with ph... | 02/03/1981 |
| 4106922 | Alkaline decomposition process for producing calcined phosphate fertilizer A process for the production of highly citrate-soluble calcined phosphate fertilizers is disclosed. The process comprises calcinating a mixture which comprises appropriate amounts of calcium phosphates, silicic acid and an alkaline decomposing agent where... | 08/15/1978 |
| 3932166 | Landfill and soil conditioner A method for converting organic waste materials into inert humus-like materials by charring the organic waste materials by heating and drying same in the presence of certain water-soluble inorganic acids, removing residual acid and other water-soluble con... | 01/13/1976 |
