A sensitivity analysis of the EAASR reaction rate and background concentration

was performed for the SC STA scenario. The calibration of each parameter was found to

significantly affect results of the analysis. Particularly reaction rates less than 0.05 days-1

for a background concentration of 0.025 mg/L. To reproduce TP removal estimates

provided in the BODR an reaction rate of 0.0033 days-1 for a C* of 0.025 is needed. Due

to the differences in configuration and reaction rate the modeling efforts are not directly

comparable.

 An analysis of the predicted performance of the EAASR and STA 3/4 systems

was performed. STAs were found to provide significantly greater water quality treatment

than reservoirs. The STA systems will approach the background concentration

asymptotically for retention times greater than 25 days. However, since the STA is

operated at much lower depths than the reservoir, they will have much lower HRT for a

given area and inflow. The initial concentration can affect the outcome of the EAASR or

STA 3/4, especially if measured by the percent removal of TP.

 Chapter 5 presented the results and conclusions of the UF WQDT analysis of the

scenarios described in Chapter 4. The overall results for the three configurations are

shown in Table 5-15. The input TP concentrations vary from 0.067 to 0.133 mg/L

depending on the number of compartments. Similarly, the output concentrations from the

EAASR indicate a significant treatment effect with the concentrations reduced to 0.028 to

0.063 mg/L depending on the configuration. However, the variability in performance is

greatly dampened in the STA 3/4 outflow with the outflow concentrations all very similar

in the 0.020-0.021 mg/L range. The EAASR has a significant water quality impact

because its hydraulic residence times exceed two months. The residence times in STA