the reactions, kinetics and mass-transfers in the biological gas desulfurization process

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.


H2S is a toxic and corrosive gas that is present in many (bio-)gas streams and for which a biological treatment has been developed for its removal. The biological treatment consists of absorption of H2S into the process solution and the subsequent conversion to elemental sulfur crystals by sulfur oxidizing bacteria (SOB). The process scheme is split into an anaerobic and aerobic zone. Reactions in the anaerobic zone prepare the

Recent research has shown several biological and chemical reactions in the anaerobic zone interact with each other. Chemically, dissolved sulfide reacts with sulfur crystals already present in the buffer to form a compound called polysulfides. Furthermore, bacteria are able to anaerobically take up part of the sulfide. Though some research has been carried out on both processes, nothing is known about their interactions under industrially relevant conditions.

This offer, concentrating on lab experiments, will focus on running one-day batch experiments in small bioreactors under different operating conditions. It also includes sampling and chemical analyses. The goal is to generate data that deepens our understanding of the reactions in the anaerobic zone and their kinetics. For students interested in modelling, the project can be adapted to allow for some modelling alongside the lab-experiments.

Carrying out batch bioreactor experiments;
Interpretation of results;
Partaking in scientific discussions, optimizing experiments;
Designing new experiments if needed;
Modelling of the results (optional, if student wishes to develop this skill)


Opportunity to contribute to highly relevant novel research with direct application in industry;
Working in a highly international environment;
Working in a team of PhDs and students;
Valuable experience in various lab-techniques and carrying out research;
Allowance of 200-400 euros per month.

-Background in chemistry, chemical engineering, biotechnology or related degree;
-Interest in lab-work, extensive experience is not required;
-Willingness to work with a toxic gas. Though we will not directly be working with the gas, you will work in an environment where this gas is present in the setup next to ours;
-Actively enrolled in an MSc degree and willing to come to Leeuwarden, The Netherlands, for a minimum of 6 months, starting in spring 2024;
-Fluent in English (speaking, writing and communication skills);
-Enthusiastic and excited to work in a team;

How to apply:
Please attach your CV (max 1 pages) and motivation letter (max 1 page) in the application form below. You can contact the PhD researcher Joris Bergman through the message option below.

Understanding the reactions, kinetics and mass-transfers in the biological gas desulfurization process

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