# US 11,299,408 B2 · Method and assembly for recovering magnesium ammonium phosphate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,299,408 B2 - Document ID: US11299408B2 - Status: Granted - Kind: B2 - Application number: 16/962,641 - Filed: 2018-12-17 - Published: 2021-02-04 - Granted: 2022-04-12 - Earliest claimed: 2018-01-18 - Assignees: Cnp Cycles GmbH - Applicants: Cnp Cycles GmbH - Inventors: Thomas Klamp; Bernhard Ortwein - Web page: https://patentgrep.com/patent/US11299408B2 ## CPC - C02F 1/5254: {using magnesium compounds and phosphoric acid for removing ammonia} - C02F 1/5281: {Installations for water purification using chemical agents} - C02F 3/308: {Biological phosphorus removal} - C02F 1/20: by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) - C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) - C02F 2001/5218: {Crystallization} - C02F 2101/105: {Phosphorus compounds} - C02F 2201/002: Construction details of the apparatus - C02F 2203/006: details of construction, e.g. specially adapted seals, modules, connections - C02F 2303/06: Sludge reduction, e.g. by lysis - C02F 2305/00: Use of specific compounds during water treatment - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract The invention relates to a method and an assembly for recovering magnesium ammonium phosphate from slurry that is supplied to a reaction container (10) in which an aerobic milieu is present and in which the slurry is guided in a circuit with the aid of ventilation. Cationic magnesium, such as magnesium chloride, is added to the slurry, and magnesium ammonium phosphate crystals which are precipitated from the slurry are removed via a removal device (30) provided in the base region of the reaction container. Substances which contain magnesium ammonium phosphate crystals collected in the removal device (30) are loosened and/or rinsed. ## Claims ### Claim 1 A method for recovering magnesium ammonium phosphate from sludge supplied to a reaction tank in which an aerobic environment prevails, and in which the sludge is guided in a cycle supported by aeration, with cationic magnesium being added to the sludge, and magnesium ammonium phosphate crystals precipitated from the sludge being removed via an extraction device provided in a floor area of the reaction tank, wherein substances collected in the extraction device, and containing the magnesium ammonium phosphate crystals, are loosened up, and/or flushed, and wherein gas and liquid are introduced into the extraction device alternatingly, and substances exiting the extraction device on a side of the tank by means of a guide are passed through a funnel-shaped, or conically designed lower section of the reaction tank, and subjected in an adjoining cylindrical upper section to a flow in the cylindrical upper section. ### Claim 2 (depends on 1) The method according to claim 1, wherein the gas and the liquid are introduced in the floor area of the interior of the extraction device. ### Claim 3 (depends on 2) The method according to claim 2, wherein the gas is air. ### Claim 4 (depends on 2) The method according to claim 2, wherein the liquid is service water. ### Claim 5 (depends on 2) The method according to claim 2, wherein the extraction device has a hollow-cylindrical internal geometry. ### Claim 6 (depends on 1) The method according to claim 1, wherein the cationic magnesium is magnesium chloride. ### Claim 7 An arrangement for recovering magnesium ammonium phosphate from sludge, comprising a reaction tank with a cylindrical upper section that merges into a funnel-shaped, or conically designed lower section, from which, in turn, extends an extraction device for magnesium ammonium phosphate crystals, at least one aerator device being provided in the upper section, and wherein the extraction device has at least one first connection for gas to be introduced, and at least one second connection for liquid to be introduced, and a guide aligned with the extraction device, and having a hollow-cylindrical geometry with widening on a side of the extraction device for passing substances washed upward in the extraction device into the cylindrical upper section, is arranged in the lower section. ### Claim 8 (depends on 7) The arrangement according to claim 7, wherein, in a floor area of the extraction device, several first connections and/or several second connections are provided. ### Claim 9 (depends on 8) The arrangement according to claim 8, wherein the several first connections, and/or the several second connections, are evenly distributed around the circumference of the extraction device. ### Claim 10 (depends on 7) The arrangement according to claim 7, wherein first and second connections are connected alternatingly to the extraction device. ### Claim 11 (depends on 7) The arrangement according to claim 7, wherein the interior of the extraction device collecting the magnesium ammonium phosphate crystals has a cylindrical or conical geometry. ### Claim 12 (depends on 7) The arrangement according to claim 7, wherein the extraction device is designed closure-free on a side of the tank. ### Claim 13 (depends on 7) The arrangement according to claim 7, wherein a closure device is located on a floor side of the extraction device. ### Claim 14 (depends on 13) The arrangement according to claim 13, wherein the closure device is selected from a shutoff valve and a rotary valve. ### Claim 15 (depends on 7) The arrangement according to claim 7, wherein the longitudinal axis of the guide coincides with the longitudinal axis of the extraction device. ### Claim 16 (depends on 7) The arrangement according to claim 7, wherein the longitudinal axis of the guide coincides with the longitudinal axis of the reaction tank.