GPS-X Technical Reference

Other Models 320
The settleability model was calibrated to the entire set of pilot data shown in Figure
11-12, using the optimizer tool in GPS-X and the sum of squares objective function (i.e.
least squares parameter estimation). The calibrated parameter values are given below:
E u
C TSS
= 0.86 (ultimate settleable solids fraction at high influent TSS)
= 82 mg/L (parameter that controls the exponential shape of the removal
efficiency vs. influent TSS relationship)
K = 93 m/h (surface overflow rate at 0.5E u)
A 3-dimensional plot of the calibrated settleability model is shown in Figure 11-13. The
model shows the same trends as the measured pilot data shown in Figure 11-12. To
check the performance of the calibrated settleability model, dynamic simulations were
performed using the full RTB model and the measured influent TSS concentrations from
the pilot tests. The simulation results showed reasonable agreement with the measured
pilot study results given the estimated measurement error.
Figure 11-13 - Plot of Calibrated Settleability Model
GPS-X Technical Reference