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Riechers Spence & Associates Job #: 21 02 049.0 <br /> Consulting Civil Engineers Date: 10/21 /02 <br /> Design conditions and assumptions: <br /> _ 1 . Fine bubble ceramic diffusers with an aeration clean water 02 <br /> transfer efficiency = 35% <br /> 2. Liquid depth in the aeration tank = 14' (4.267 m) <br /> 3. The point of air release for the ceramic diffusers is 1 .0' (0.3028 m) <br /> above the tank bottom. <br /> 4. DO in the aeration tank = 2.0 g/m3 <br /> 5. Site elevation is 15 ft (4.572m) <br /> (pressure = 14.696 Ibf/int = 101 .33 kPa) <br /> 6. Aeration a factor = 0.65 ; (3 = 0.95 diffuser fouling factor F = 0.90 <br /> 7. Solids retention time (SRT) = 5d <br /> 8. Design mixed liquor suspended solids mass XTss concentrations = <br /> 3000 g/m3 <br /> 9. TKN peak/average factor of safety FS=2 <br /> Design: <br /> 1. Wastewater characteristics <br /> _ 1 .1 Design influent characteristics: <br /> Constituent Concentration <br /> /M3 <br /> BOD 10,000 <br /> _ SBOD 6,900 <br /> COD 16,000 <br /> SCOD 11 ,100 <br /> rbCOD 8,000 <br /> TSS 2,000 <br />_ vSS 1 ,600 <br /> TKN 40 <br /> N H4-N 30 <br /> TP 40 <br /> Alkalinity 730 <br /> bCOD/BOD ratio 1 .55 <br /> 14 <br />