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Riechers Spence & Associates Job #: 21 02 049.0 <br /> Consulting Civil Engineers Date: 10/21/02 <br /> 5. Amount of nitrogen oxidized to nitrate => Nitrogen balance <br /> _ NOx = TKN - Ne -0.12 Px.eio/Q <br /> = 40 g/m3-10 g/m3--0.12 gN/gVSS*13.83 kgVSS/d*103 g/kg/3.4069 m3/d <br /> _ - 457 g/m3= 0 <br /> Use NO, of influent because almost all nitrogen will be oxidized to nitrate <br /> NO. = 5 mg/I <br /> 6. Mass and Concentration of VSS and Tss in the aeration basin <br /> Mass = Px(SRT) <br /> a.) Concentration of VSS and TSS in the aeration basin <br /> Px,v$S = Px,aio + Q(nbVSS) <br /> = 13.83 kg/d + 3.4069 m3/d*77.78 g/m3*1 /103 kg/g <br /> = 13.83 kg/d + 0.265 kg/d = 14.096 kg/d <br /> Px,Tss = Px,Bl0/0.85 + Q(nbVSS) + Q(TSSo-VSSo) <br /> = 13.83 kg/d/0.85 + 0.265 kg/d + 3.4069 m3/d (2000-1600) g/m3 <br /> 1 /103 kg/g <br /> = 17.898 kg/d <br /> b.) Mass of VSS and Tss in the aeration basin <br /> (XVSS)(V) _ (Px.vss) SRT <br /> = 14.096 kg/d * 8.44 d <br /> = 118.97 kg <br /> (XTss)(V) _ (Px,Tss) SRT <br /> = 17.898 kg/d * 8.44 d <br /> = 151 .06 kg <br /> 7. Aeration Tank Volume and detention time <br /> a.) Aeration tank volume <br /> (V)(XTss) = 151 .06 kg <br /> at MLSS = 3,000 g/m3 <br /> V = 151 .06 kg * 103 g/kg / 3000 g/m3 <br /> = 50.353 m3 <br /> b.) Aeration tank detention time <br /> Use 3 aeration tanks at 16.65576 m3 each <br /> 17 <br />