STUDY OF WASTE STABILIZATION POND GEOMETRY FOR THE WASTEWATER TREATMENT EFFICIENCY

Pond design involves several physical, hydrological, geometrical and dynamic variables to provide high hydrodynamic efficiency and maximum substrate utilization rates. Computational fluid dynamic modelling (CFD) allows the combination of these factors to predict the behavior of ponds by using different configurations. The two-dimensional depth-integrated model SMS was used in this study to simulate of hydrodynamics and water quality. A set of 12 configurations including baffling and pond geometry were modeled. The model was run at steady state case with raw wastewater to study the effect of the assumed rectangular shapes and dimensions with constant area, for various values of water depth, flow rate and hydraulic retention time (HRT) of raw wastewater. The model was also run for different rectangular shapes with baffles; the area was manipulated by increasing the ratio between rectangular width and length as 1, 2, 3 and 4 times respectively.