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US 11,897,823 B2Granted
Production of nitrogenous fertilizer from wastewater
AssigneePwg LLC
InventorsEdward Rosenthal, Griffith Lunn
Life of this patent
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AssigneePwg LLC
InventorsEdward Rosenthal, Griffith Lunn
Estimating the term…
An ammonia capture and recovery system comprises five process steps, including an ammonia removal step, an ammonia recovery step, a product granulation step, a granulated product wax-coating step, and a granulated product encapsulation step. These steps are modular in that multiple approaches are valid for each step if it meets the process requirements for the next influent. Also, a method of taking ammonia-containing wastewater and producing several water fractions (preferably of decreasing volume and increasing purity) and a time-release ammonium-containing fertilizer, resulting in a sustainable nitrogenous fertilizer product that reduces fertilizer use and subsequent nutrient runoff while being produced from wastewater and not fossil fuel or hydrogen sources.
A method of obtaining a granulated nitrogen-containing encapsulated fertilizer product from wastewater, wherein the method comprises an ammonia capture and recovery system comprising five method steps, wherein the method steps include an ammonia removal step to produce a stream comprising a gas with entrained ammonia and water, an ammonia recovery step producing an ammonium salt by addition of a mineral acid to the gas with entrained ammonia and water, a granulation step of the ammonium salt forming a granulated product, a granulated product wax-coating step, and a granulated product encapsulation step.
Dependencies are inferred from the claim text.