PhD: Energy-efficient electrochemical phosphate recovery (EPR) - optimisation and upscaling

Published on
September 9, 2021
Location Leeuwarden
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We are looking for

Research challenges - Conventional P recovery processes from wastewater have severe limitations. EBPR recovers approximately 10-30% of the incoming phosphate load and requires Mg dosing for struvite precipitation. CPR involves adding Al or Fe salts to form insoluble aluminium - or iron phosphate, which can be recovered from the sludge. Electrochemical Systems (ES) are a suitable alternative to conventional phosphate recovery approaches. Previous research has shown that an ES can recover calcium phosphate (CaP) as hydroxyapatite or amorphous calcium phosphate. CaP recovery relies on the hydrogen evolution reaction at the cathode, which increases the local pH sufficiently for CaP precipitation. Contrary to CPR and EBPR, electrochemical phosphate recovery (EPR) does not require any chemical addition and solely relies on electrical energy. While EPR was proven at a laboratory scale with real wastewater and first steps have been made towards upscaling, further insights are needed into this technology for future upscaling and competitiveness.

Objectives and methodology - This PhD project will focus on optimising electrochemical phosphate recovery in terms of energy use and recovery efficiency of the system. Therefore, different system designs, material choices, and electrode materials and modifications will be investigated. The optimisation process will involve both experimental and modelling work. Another focus point will be the “harvesting” process and product quality of the recovered CaP product. Working under realistic conditions (real wastewater) and collaborating with the participating companies in the “Resource Recovery” theme will allow upscaling the electrochemical phosphate recovery process. 

We ask

  • MSc degree in Environmental technology, chemical engineering, or equivalent with excellent grades;
  • Strong background in electrochemistry and hands-on experience with electrochemical workstation;
  • Ability to work independently in the laboratory and to rigorously design and perform experiments in a result-oriented and thorough manner;
  • A strong interest in carrying out multidisciplinary research in an international environment;
  • Excellent interpersonal skills to work effectively with team members from different backgrounds;
  • Good oral and written communication skills in English;
  • A strong interest in personal development and career growth;
  • A strong interest in advancing scientific knowledge into real-world application.

We offer

Wageningen University & Research offers excellent terms of employment. A few highlights from our Collective Labour Agreement include:

  • sabbatical leave, study leave, and paid parental leave;
  • working hours that can be discussed and arranged so that they allow for the best possible work-life balance;
  • the option to accrue additional holiday hours by working more, up to 40 hours per week;
  • there is a strong focus on vitality and you can make use of the sports facilities available on campus for a small fee;
  • a fixed December bonus of 8.3%;
  • excellent pension scheme.

In addition to these first-rate employee benefits, you will of course receive a good salary.

More information

Academic and Wetsus supervisors: Dr. Philipp Kuntke (Scientific project manager, Wetsus) and Dr. Renata van der Weijden (Senior advisor biogeocheminstry - Environmental Technology (ETE), Wageningen University)
University promotor: Prof. dr. ir Cees J.N. Buisman (Environmental Technology (ETE), Wageningen University)

You can apply by selecting your vacancy on Applications directly to WUR will not be taken into consideration. The procedure to apply is written in detail on

Only applications that are complete, in English, and submitted via the application webpage before the deadline will be considered eligible.

Keywords: Environmental technology, Wastewater, Phosphate recovery, Electrochemistry

We are

Phosphorus (P) is an essential element for life, and our society is mainly dependent on the use of P derived products, including fertilisers and various other chemicals. The industrial source for P is phosphate-rich ores (phosphate rock). Known phosphate reserves are scarce, and their geographical spread is limited, with no substantial phosphate deposits found within the EU. Additionally, the quality of these deposits is decreasing over time due to increasing contamination with heavy metals. Therefore, phosphate was classified as a critical raw material (CRM) by the EU in 2014. Substantial amounts of phosphate can be found in our domestic and industrial wastewater originating from food production, consumption, and other manufacturing processes. Wastewater as a secondary phosphate resource is largely underexploited as the main focus of wastewater treatment plants (WWTPs) is phosphate removal. Therefore, WWTPs relies on either chemical phosphate removal (CPR) or enhanced biological phosphate removal process (EBPR).

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