Abstract
Two experiments were performed using scale models of air lifting towers placed in a cubic water tank. The scale models were equipped with different diffusers forming various bubble plumes, which included 4 continuous and 2 intermittent types. First, flow distribution was measured by a PIV and the efficiency of water entrainment was determined. Second, the rate of oxygenation by aeration was measured and the oxygen transfer coefficient could be calculated. As a result, it was apparent that the 4 continuous types had higher performances than the 2 intermittent types.
