Process & contact
ViviMag® (Haskoning)
Members of ESPP
This technology was developed by Wetsus and Kemira, and was acquired by Haskoning in
April 2026.
Website:
Haskoning acquires patent for groundbreaking ViviMag water technology
Award-winning breakthrough in phosphorus recovery
Contacts:
Updated 4/2026
Input materials
Sewage sludge digestate, before dewatering, from WWTP using iron salts for chemical P removal
Output products
Product: vivianite (iron(II) phosphate).
Can be used as an iron fertiliser. Or possibility to process to PK fertiliser and iron coagulants for use in WWTPs
Process description
Precipitation of iron phosphate in the form of vivianite, by reducing iron(III) to iron(II) in anaerobic conditions (digester), then recovery of the vivianite by magnetic separation. Vivianite can be used as an Fe fertilizer to treat Fe-chlorosis of for instance olive treas. Optional extraction of P from vivianite to liquid PK fertiliser and recycle iron as coagulant to WWTP
Operating status
Manual 1 m3/h pilot for magnetic separation of vivianite tested at Nieuwveer WWTP, NL (2019).
Automatic 1 m3/h pilot (photo) currently in operation, with continuous trials in Germany (2022), Denmark (first half of 2023) and the Netherlands.
Plans for a full scale facility at Brabantse Delta water authority WWTP in Breda, the Netherlands