E-Andrew Sindt Creative Component S11.pdf

Absolute value of percent deviationfrom observedEffluent TP concentrations were corrected by adjusting the aerobic P/PHA uptake rate (Figure 4.18). Anadjustment of -19% to aerobic P/PHA uptake gave the lowest percent error at 2.7% for effluent TP.25020015010050TP0-40% -30% -20% -10% 0%Percent adjustment of aerobic P/PHA uptakeFigure 4.18 - Effluent TP concentration calibration for BNR-S1 mode by adjustment of PAO aerobicP/PHA uptake parameterCalibrated simulator parameters for BNR-S1 mode are summarized in Table 4.6. The BNR-S1 moderequired adjustments to two additional simulator parameters (aerobic P/PHA uptake and substrate(NH 4 + ) half-saturation concentration) in order to correct the simulated effluent concentrations toobserved values. The simulator default values for OHO yield, aerobic P/PHA uptake, AOB maximumspecific growth rate, NOB maximum specific growth rate, and maximum Vesilind settling velocity wereall revised (reduced) because the predicted TSS, NH 3 -N, NO 2 -N and TP removal efficiencies were too highwhen using the default values. In order to increase the predicted effluent NH 3 -N concentrations toconform with observed concentrations, the substrate (NH 4 + ) half-saturation concentration wasincreased significantly.Table 4.6- Calibrated simulator parameters for BNR-S1 modeParametersDefaultValueCalibratedValuePercentChangeUnitsStoichiometricHeterotrophic yield (OHO) 0.666 0.6327 -5 mgCOD/mgCODAerobic P/PHA uptake (PAO) 0.95 0.7695 -19 mgP/mgCODKineticAOB max. spec. growth rate 0.9 0.630 -30 1/dSubstrate (NH + 4 ) half-saturation 0.7 1.05 50 mgN/LNOB max. spec. growth rate 0.7 0.49 -30 1/dSettlingMax. Vesilind settling velocity 170 127.5 -25 (m/d)60