Review article

This study examines particle deposition in a newly designed lamella module. To improve deposition efficiency, the inter-plate space of the module is divided into an upper wastewater flow channel and a lower sludge flow channel, which is hydraulically connected to the upper row of orifices. To analyze the kinetics of particle deposition, a mathematical model based on the theory of deposition in shallow depth flow is proposed. The model for predicting particle motion trajectories accounts for the forces of buoyancy, gravity, fluid resistance, and additional flow forces acting on the particles in the sludge removal channel, which has made possible to formulate a force balance equation. An experiment was conducted to evaluate the mathematical model. The results of the laboratory study indicate that the model accurately reflects the process of particle deposition in the lamella module. This study provides theoretical justification and practical recommendations for the design of new lamella modules.