The average flow at the Kyrene WRF is approximately 15,140 m3/d (4 mgd) and the effluent meets permit requirements. The plant has occasional nitrate spikes that bring effluent TN to the brink of exceeding the permit limit of 8 mg/L. The plant sometimes has experienced difficulty
with excessive foam/scum formation which has resulted in biomass loss. The influent contains relatively high sulfide content that poses a potential of generating high hydrogen sulfide in the process. A GPS-X process model was developed and calibrated based on plant operating data. The calibrated
model was used to evaluate the aeration effect on effluent nitrate spikes, effect of biosolids loss through scum formation and foaming, and influent nitrate levels on potential H2S generation. A series of sensitivity analysis was performed. This process model provided a valuable
tool to the operational control to improve the plant's operational performance to consistently meet the effluent permit.
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