Subsurface aeration evaluation

To separate performance of subsurface aeration devices from the mass-transfer evaluation for standardized evaluations, a mass-transfer model consistent with the subsurface aeration process phenomenon was developed for examining submerged aeration equipment. As an independent check, the oxygen-transfer rate determined by the model test conditions was compared with the rate obtained from the slope of a nonlinear least-squares curve fit of the data at zero dissolved oxygen.