Process & contact
PHOSPHIX™ (Clean TeQ Water)
https://www.cleanteqwater.com/technology/phosphix/
Updated 2/2022
Input materials
Liquor stream with soluble phosphorus < 100 mg/l P-PO4 (including very low P concentrations) and pH in the range 6-8.
Output products
Calcium phosphate (hydroxyapatite) for use as slow-release fertiliser or in fertiliser production
Treated water with <0.1 mg/l P-PO4
Process description
Phosphate is selectively removed to < 0.1 mg/L using proprietary continuous ion exchange. Phosphate is desorbed using calcium-rich sodium hydroxide into a concentrated stream. Hydroxyapatite is crystallised from this stream.
The recovered regenerant stream is reused for desorption, limiting chemical consumption and waste production
Operating status
Laboratory scale testing complete, using synthetic feeds simulating sewage treatment works (MBBR) effluent. Pilot plant of capacity c. 2 m3/h being prepared to remove P from river water