His main research area is wastewater technology, especially resource recovery from wastewater (energy and nutrients recovery). In this field, he is running a research project funded by Marie Curie fundation: Biofilms in bioreactors for advanced nitrogen removal (BioNIT). Next to this, he continues with his previous research focused on essential metals in anaerobic granular sludge (chemical speciation, bioavailability) and Magnetic Resonance Imaging (MRI) of transport processes in methanogenic granular biofilm.