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A calibration methodology and model-based systems analysis for SBRs removing nutrients under limited aeration conditions

A methodology was proposed for the model calibration of nutrient removing lab-scale SBR’s under limited aeration. Based on in-process measurements and influent wastewater characterization, the ASM2d model was modified by adding an organic nitrogen module linked to the hydrolysis mechanism. After calibration the simulation results showed that enhanced biological nutrient removal occurred during the fill-period and under reduced aeration that achieves so-called ‘Simultaneous Nutrient Removal’. A model-based systems analysis was performed in terms of the contributions of the different processes to overall oxygen, nitrogen and phosphate utilization. In addition, simultaneously occurring biological reactions were compared during the different phases.