Luuk de Waal is a practice-oriented researcher in the Drinking Water Treatment team. He uses various pilot installations to develop innovative techniques in water treatment, water distribution and water storage. By performing lab experiments, Luuk gains basic insights into the working principles underlying current water treatment technologies, such as arsenic removal in rapid sand filters. By converting experimental observations into new research questions, Luuk actively contributes to knowledge development and innovation at KWR. Luuk also works on several sustainability challenges associated with the development of a circular water sector; these include research on current concentrate management techniques and on the subsurface storage of water for later reuse. By acquiring fundamental knowledge, testing and (further) developing innovative ideas, and advising on today’s challenges, Luuk gains water-sector-wide insights which he then applies for the benefit of the sector as a whole. Luuk has a background in chemistry and earned a (joint) Master’s degree in Water Technology from the universities of Wageningen, Groningen and Enschede, for his work on biofouling management using bacteriophages in membrane filtration systems.