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 the results especially if the reaction rates are less than 0.05 days-1 for a

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

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

differences in configurations and reaction rates 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.

 The initial concentration of each scenario is calculated in Chapter 5, as the inflow

of the TC and FC scenarios are a function of their removal. The resulting concentrations

and the inputs from this chapter will be used to generate TP estimates for each scenario.