recovery from sewage sludge via magnetic separation of vivianite

Anticipated start: January/ February/ March 2024
Duration: 6 – 12 months
Location: Wetsus Research Institute, Leeuwarden, the Netherlands

There are a few possibilities for allowances:
– The allowance for students is €200. The student can apply for ‘Wetsus Grant’ allowance (€200 extra; an internal committee decides if the allowance will be granted).
– Students can apply for Erasmus; (if the Erasmus grant is less than €400, the student can apply for the Wetsus Grant).
– Erasmus
*The Wetsus Grant allowance is not guaranteed and must be approved by the Grant Committee.

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 reducing environments such as in the anaerobic digester or in excess sludge left in anaerobic condition for a few days. Since vivianite is paramagnetic, its recovery from sludge is possible via magnetic technologies. The internship focuses on studying vivianite formation in sludge and its recovery efficiencies with magnetic separation. You are also welcome to contribute to the topic of the project and shape it according to your interest!


Your tasks include:

  • Designing experimental protocols
  • Analyzing samples (ICP-OES, SEM-EDX, TS, VS, microwave digestion, Raman, IR, TGA, Mastersizer 3000, etc)
  • Preparing samples for further analyses (Mossbauer spectroscopy, XRD, SQUID, etc.)

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 and possibly work at a pilot scale installation
  • 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


Interested? Please fill in the application form below and in the message you can ask further questions to the phd researcher Ha Nugyen.

Application form: Phosphate Recovery from Sewage Sludge via Magnetic Separation of Vivianite

  • Max. bestandsgrootte: 1 GB.
  • Max. bestandsgrootte: 1 GB.