Bas Wols works as a scientific researcher on the Water Treatment team. He models water treatment processes, such as UV/H2O2 oxidation, membrane filtration, sand filtration, softening and aeration. He uses CFD modelling to characterise the water flow. The CFD models are combined with physico-chemical models to simulate the effect of the treatment; this has led to improvements the UV/H2O2 system designs. Furthermore, Bas also works a lot on modelling the distribution network. He developed the Comsima model to calculate the pressure in pipelines resulting from all kinds of loads, such as internal pressures, traffic and differential settlements. Bas also works with statistical models. These are used to research correlations between climate and pipe failures, and to determine correlations between chemical substances and treatment efficiency (QSARs). Also, Bas works as a manager of various projects and as theme coordinator of the drinking water treatment theme group of the Joint Research Programme of KWR and the water utilities. Bas works for one day a week at Wetsus, where he supervises AIO’s in their research on treatment of organic micropollutants.