Avaliação da eficiência e modelagem matemática da remoção de material particulado em canal gramado integrante de técnica compensatória construída em escala real

Abstract

A math model was applied to describe the removal of particulate matter in lawn canal built in real scale. For this purpose different initial concentrations (Co) of particulate matter were investigated, as following: 65; 131; 196; 262 and 327 mg/L. The investigated rains, containing suspended solids, were discharged on the channel which has 100 m in length and slope of 2 %. Measurements were made of particulate material through the analysis of turbidity and total suspended solids (TSS) in 26 locations along the length of the channel. The experimental data were fit to the model using nonlinear regression parameter (kd) and (C*), which correspond to the decay kinetics constant and minimum limiting values the curve removal, respectively. Fractions removed and mathematical adjustment were assessed and performed for each isolated event and also for the result set. On average, the magnitude of the relative error ranged from 0.83% to 5.11%, with the highest average value obtained for the lowest concentration of particulate matter (65 mg L- 1). Regarding the values obtained for the decay constants (kd ), which represent the frequency of removal of particulate matter, it is noted that the same trends to a minimum value for the higher initial concentrations of particles (Co) . This fact indicates that the higher the initial concentration of particulate matter (Co), the greater the extent of travel required for its removal, with a maximum observed at around 80 m, for concentrations above 196 mg.L-1.