USBF Configurations   Standard Configuration Enhanced TN Reduction Configuration With Supplemental Post-filtration With Supplemental Disinfection With Phosphorus Precipitation* BOD < 10 mg/l < 10 mg/l < 10 mg/l < 10 mg/l < 10 mg/l TSS < 10 mg/l < 10 mg/l < 5mg/l < 5 mg/l < 5 mg/l N-NH4 < 1 mg/l < 0.5 mg/l < 0.5 mg/l < 0.5 mg/l < 0.5 mg/l TN < 20 mg/l < 10 mg/l < 10 mg/l < 10 mg/l < 10 mg/l TP < 2-3 mg/l < 2-3 mg/l < 2-3 mg/l < 2-3 mg/l < 0.25 mg/l Turbidity     < 0.1 NTU** < 0.1 NTU** < 0.1 NTU** FC       < 2.2 CFU/100ml < 2.2 CFU/100ml * Alum or other phosphorus precipitants dosed into the USBF bioreactor ** 0.1 NTU with External Membrane Filtration

‘Tertiary Treatment’ Comparison

USBF SBR MBR Power Requirements X X+ X++ Footprint Small Small + Small - Headwork Requirements Standard Standard Above Standard Hydraulic Flexibility Self-regulating Poor None Operational Complexity Simple Complex Very Complex Capital Cost X X+ X++ Operational Costs X X+ X++