US 11,834,355 B2
Method and system for phosphate recovery from a stream
Philipp Karl Wilfert, Leeuwarden (NL); Leendert Date Korving, Leeuwarden (NL); Peter Carlo Rem, Leeuwarden (NL); Geert-Jan Witkamp, Leeuwarden (NL); Marinus Cornelis Maria Van Loosdrecht, Leeuwarden (NL); Achim Lulian Dugulan, Leeuwarden (NL); Kees Goubitz, Leeuwarden (NL); and Simon Peter Maria Berkhout, Leeuwarden (NL)
Assigned to Kemira Oyj, Helsinki (FI)
Appl. No. 16/493,672
Filed by Stichting Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden (NL)
PCT Filed Mar. 14, 2018, PCT No. PCT/NL2018/050159
§ 371(c)(1), (2) Date Sep. 12, 2019,
PCT Pub. No. WO2018/169395, PCT Pub. Date Sep. 20, 2018.
Claims priority of application No. 2018525 (NL), filed on Mar. 15, 2017.
Prior Publication US 2020/0010342 A1, Jan. 9, 2020
Int. Cl. C02F 1/52 (2023.01); C01G 49/10 (2006.01); C01B 25/30 (2006.01); C02F 1/48 (2023.01); C02F 3/28 (2023.01); C02F 1/00 (2023.01); C02F 101/10 (2006.01)
CPC C02F 1/5245 (2013.01) [C01B 25/306 (2013.01); C01G 49/10 (2013.01); C02F 1/481 (2013.01); C02F 1/5209 (2013.01); C02F 3/28 (2013.01); C02F 2001/007 (2013.01); C02F 2101/105 (2013.01); C02F 2209/18 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for phosphate recovery from a stream such as waste flow, sewage or another sludge stream, the method comprising the steps of:
providing an incoming stream comprising an initial amount of phosphate;
dosing and controlling iron salt to the stream such that precipitates are formed in the stream, wherein the precipitates comprise vivianite like structures comprising more than 60% by weight of the initial amount of phosphate in the incoming stream; and
separating the vivianite like structures from the stream,
wherein separating the vivianite like structures from the stream comprises magnetic separation of the structures with a magnetic and/or electromagnetic separator.