SHALLOW WATER EQUATION MODEL AND DISSOLVED OXYGEN TRANSPORT IN A BUBBLING AERATION SYSTEM IN THE BAY OF ASUNCION ́

Resumo

The presence of oxygen in natural water bodies is essential for the organisms responsible for photo-
synthesis, oxidation-reduction and the decomposition of organic matter. Thus, it is important to study and analyze

the distribution and concentration of dissolved oxygen (DO). This work presents a model for DO transport in a
bubbling aeration system in the Bay of Asuncion for surface water treatment. The mathematical model considers ́
DO advection-diffusion-reaction equation, as well as wind shear and bottom drag for water flow, in 2D Shallow

Water equations (SWE). The kinetic model of oxygen absorption is obtained from a prototype of bubble aera-
tion system for several air-flows. The equations are solved using OpenFOAM® software, and simulations of the

bay of Asuncion are performed with mesh independence tests. The results obtained without the aeration system ́
are compared with field measurements of DO concentrations. Finally, the effects of the aeration system on the
improvement of water conditions in the bay of Asuncion are analyzed and presented ́