US 11,964,892 B2
Phosphorus control for waste streams from glyphosate manufacturing processes
Peng Lei, St. Louis, MO (US); Ming Ren, Chesterfield, MO (US); and Anthony E. Vaughn, St. Charles, MO (US)
Assigned to Monsanto Technology LLC, Saint Louis, MO (US)
Filed by Monsanto Technology LLC, St. Louis, MO (US)
Filed on Feb. 10, 2022, as Appl. No. 17/668,750.
Application 17/668,750 is a continuation of application No. 16/624,442, granted, now 11,279,644, previously published as PCT/US2018/039385, filed on Jun. 26, 2018.
Claims priority of provisional application 62/524,675, filed on Jun. 26, 2017.
Prior Publication US 2022/0162106 A1, May 26, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C02F 9/00 (2023.01); C01B 25/26 (2006.01); C07F 9/02 (2006.01); C07F 9/38 (2006.01); C02F 1/52 (2023.01); C02F 1/76 (2023.01); C02F 3/12 (2023.01); C02F 101/10 (2006.01); C02F 103/36 (2006.01)
CPC C02F 9/00 (2013.01) [C01B 25/26 (2013.01); C07F 9/025 (2013.01); C07F 9/3808 (2013.01); C07F 9/3813 (2013.01); C02F 1/5245 (2013.01); C02F 1/76 (2013.01); C02F 3/1215 (2013.01); C02F 2101/105 (2013.01); C02F 2103/36 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A process for recovery of phosphorus from a waste stream comprising inorganic phosphorous, the process comprising:
subjecting at least a portion of the waste stream to biological treatment by microorganisms to form a biologically treated waste stream;
contacting the biologically treated waste stream with an oxidizing agent to form an oxidized treated waste stream, wherein the oxidizing agent is selected from the group consisting of calcium hypochlorite, sodium hypochlorite, bleach, and combinations thereof;
contacting the oxidized treated waste stream with a precipitant, thereby forming within the oxidized treated waste stream phosphate containing precipitates, wherein the precipitant comprises a metal selected from the group consisting of calcium, aluminum, iron, magnesium, and mixtures thereof; and
recovering a phosphate containing cake from the oxidized treated waste stream, thereby forming a treated waste stream.