Patent ID: 11964892
Assignee: MONSANTO TECHNOLOGY LLC
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 17:
18. A process for recovery of phosphorus from a waste stream comprising inorganic phosphorous, the process comprising:
removing a portion of the waste stream as a oxidation phosphate liquor stream and contacting the oxidation phosphate liquor stream with an oxidizing agent to oxidize at least one organic phosphorus compound to form phosphate (PO43−) and thereby forming an oxidized phosphate stream, wherein the oxidizing agent is selected from the group consisting of calcium hypochlorite, sodium hypochlorite, bleach, and combinations thereof;
combining the oxidized phosphate stream with the waste stream to form a combined oxidized phosphate waste stream and contacting the combined oxidized phosphate waste stream with a precipitant, producing a precipitant treated phosphate stream, wherein the precipitant comprises a metal selected from the group consisting of calcium, aluminum, iron, magnesium, and mixtures thereof;
subjecting the precipitant treated phosphate stream to biological treatment by microorganisms to form a biologically treated waste stream; and
recovering a phosphate containing cake from the biologically treated waste stream, thereby forming a treated waste stream.