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Riechers Spence 8, Associates Job #: 21 02 049.0 <br /> Consulting Civil Engineers Date: 10/21/02 <br /> 3. Theoretical and Design SRT <br /> _ 3.1 Theoretical SRT <br /> SRT = 1 = 1/µn = 1/(0.237) = 4.22 d <br /> 3.2 Design SRT <br /> FS = TKN peak/ TKN avg. = 2.0 <br /> Design SRT = FS * theoret. SRT = 2.0 * 4.22 = 8.44 d <br /> 4. Biomass production <br /> a. Biomass production <br /> PX.BIO = Q*Y*(SO -S) + fd *kd *Q*Y*(So -S)*SRT + QY„(NO.r) <br /> l+(kd *SRT) 1+(kd *SRT) 1 +(kd„ *SRT) <br /> _ Q = 3.4069 m3/d <br /> Y = 0.4 g VSS/g bCOD <br /> So = 15,500 g bCOD/m3 <br /> S = k,[1+kd(SRT)l _ 20g/m'[1 +0.081g/gd(8.44d)]_1 .39 g bCOD/m3 <br /> (SRT)(p. -kd)-1 [(8.44)(3.05-0.081)g/gd]-1 <br /> _ Kd,T=IOC = 0.081 g/gd <br /> µn.m. o^c = 3.05 g/gd <br /> Kdn,ITC = 0.054 g/g.d <br /> Yn = 0.12g VSS/g NO. <br /> Assumed: NO. = 80% (TKN) <br /> = 0.80 * (40 g/m3) = 32 g/m3 <br /> PX,BIO = <br /> 3.4069m' /d*0.40g/g*(15,500-1.39)g/m' *1/10'kg/g <br /> 1+(0.081g/gd*8.44d) <br /> 0.1 5g/g*0.08 1 g/gd*3.4069m 3 /d*0.40g/g*(15,500-1.39)*8.44d*1/10'kg/g <br /> 1+(0.081g/gd*8.44d) <br /> 3.4069m3 /d*0.12g/g*0.32g/m3 *11103kg/g _ <br /> 1+(0.06g/gd*8.44d) <br /> [12.545+1 .286+8.68*10-5]=13.83 kg VSS/d <br /> 16 <br />