Theoretical simulations of dispersed solid particle behaviour inside a scrubbing pool within the bubble rise region are presented. The goal is to evaluate the decontamination factor of the particles during the pool scrubbing process. The basic phenomena of pool scrubbing are described. The setup used for the simulation validation is presented. Then, the boundary and initial conditions of the PECA experiments, which were performed at CIEMAT (Madrid, Spain) and were used for simulations, are presented. The subgrid model for decontamination through transfer of particles from gas bubbles to the surrounding liquid is described. The calculation results are evaluated and compared with the part of the PECA experimental results to which the proposed modelling is applicable.