Numerical simulation and experiment of gas-liquid flow in aeration tanks

A two-fluid model was adopted to simulate the three-dimensional gas-liquid flow in an aeration tank. During the modeling, different process parameters of aeration tank was simulated, and the gas-liquid flow behavior in aeration tank was analyzed. The CFD simulation and PIV measurement were both used to analyze the flow field in the aeration tank. The result shows that with the increasing of the depth, the superficial velocity in aeration raised. The greater speed of the aeration, the more remarkable of the vortex shows, which is beneficial to separation and purification. This research can provide a scientific base for the wastewater treatment of activated sludge from the point of view of fluid dynamics.