of vivianite’s paramagnetism for phosphate recovery from sewage sludge

Project background

For wastewater treatment plants dosing Fe to remove P, up to 90% of P can be present as vivianite (Fe3(PO4)2*8H2O). This mineral is both thermodynamically and kinetically favored in reduced environments such as in the anaerobic digester. Since vivianite is paramagnetic, its recovery from sludge is possible via magnetic technologies. However, vivianite is oxidized quickly. Therefore, it is important to investigate the relationship between different levels of oxidation and its paramagnetic properties to have better control over the magnetic recovery process. Moreover, other factors like impurities can also contribute to changes in vivianite’s paramagnetism and oxidation.


Your tasks include:

  • Synthesizing unoxidized vivianite under oxygen-free condition
  • Analyzing samples (ICP-OES, SEM-EDX, TS, VS)
  • Preparing samples for further analyses (Mossbauer spectroscopy, XRD, SQUID)


You are
Currently enrolled in bachelor’s or master’s study in chemical science or related field

  • Motivated, willing to learn, and committed
  • Proficient and precise with laboratory work
  • Fluent in written and spoken English
  • Preferably having a driver’s license
  • EU citizen or non-EU citizen already enrolled in a Dutch university


  • Gain hands-on experience with analytical equipment
  • Work in an advanced laboratory with colleagues from around the world
  • Have close supervision while participating in project development process
  • Depending on your situation you will receive a €200 or €400 monthly allowance


Anticipated start: February 2023

Duration: 6 – 12 months

Location: Wetsus Research Institute, Leeuwarden, the Netherlands


Interested? Please fill in the application form below. Send an email to for more information. Please upload an up-to-date CV and a cover letter explaining your interest in this specific project.

Application form Investigation of vivianite’s paramagnetism for phosphate recovery from sewage sludge

  • Max. bestandsgrootte: 128 MB.
  • Max. bestandsgrootte: 128 MB.