Numerical simulation of circular secondary clarifier

Circular secondary clarifier widely used in wastewater treatment requires optimization to improve wastewater treatment efficiency. The flow dynamics is an important parameter for the design of reactors. The solid-liquid two-phase turbulent flow in the clarifier is modeled with the two-phase mixture model. The PISO algorithm is used to decouple velocity and pressure. Comparison between the measured and computed data shows that the model can fully simulate flows in a circular secondary clarifier. These research results provide useful information for the design of secondary sedimentation tanks.