Design of U-Tube Aeration Systems

Four independent parameters were studied in the design of U-Tube aeration systems: (1) air-water ratio; (2) inlet dissolved oxygen concentration; (3) depth; and (4) water velocity. Each different combination of parameters will result in different capital and operating costs. Outlet dissolved oxygen concentration is reported in this study for the following range of independent parameters: (1) Air-water ratio = 5% to 25%; (2) inlet dissolved oxygen = 0% to 100% saturation; (3) depth = 20 ft to 40 ft; and (4) water velocity = 3.6 to 9.2 ft per sec. A computer model of the gas transfer equation, adapted to the U-Tube aerator was used to evaluate the reaeration coefficient, K2. Transfer of gases other than oxygen is analyzed.