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ActivatedSludgeProcessDesignExample(nonitrification)1.DesignInformationFlowrateQ=20,000m3/d(averageday)InfluentBOD5S0=200mg/L(soluble)InfluentVSSX0=0mg/LEffluentBOD5Se=20mg/LEffluentSS=20mg/LEffluentVSSXe=13mg/LEffluentBOD5S=7.4mg/L(soluble)GrowthyieldY=0.5g-VSS/g-BOD5Decayratekd=0.06day-1MLVSS/MLSS=0.8WastedsludgeconcentrationXW=8,000mg/LPlantaltitude=100mDesigntemperatureT=25oC2.AerationBasinSelectMCRTqX=10daysSelectMLVSSX=2,000mg/LMLSS=2,500mg/LObservedyieldYobs=Y/(1+kdqX)=0.313IncreaseinVSSPX=YobsQ(S0-S)=1,203kg/dIncreaseinSSPXM=1,504kg/dMassbalanceofwastedsludgePXM=(Q-QW)SS+QWXWQW=(PXM-QSS)/(XW-SS)=138m3/dSolidsinwastedsludge=1,107kg/dSolidslostineffluent=397kg/dReguiredbasinvolumeV=PXqX/X=6,017m3SelectbasindepthD=5.0mReguiredbasinareaA=V/D=1,203m3SelectbasinlengthL=40mReguiredbasinwidthW=A/L=30m3CheckF/Mratio=QS0/VX=0.33day-1CheckHRT=Q/V=7.2hour3.OxygenandAirRequirementInfluentBODUSS1=294mg/LEffluentBODUSS=11mg/LThOR=Q(SS1-SS)-1.42PX=3,954kg/dSelectCsw=9.08mg/LC'sw=8.24mg/LC=2.0mg/La=0.8b=0.9Fa=1-altitude/9450=0.99SOR=ThOR/[((C'swbFa–C)/Csw)(1.024)T-20a]=7,469kg/dAirdensityr=PM/RT=1.184kg/m3SelectOTE=25%SAR=[SOR/(r0.232)]/OTE=108,740m3/d=76m3/minSelectSF=1.5AR=SARxSF=113m3/min4.CircularSecondaryClarifierSelectoverflowrate=22m3/m2-dNecessaryareaforsedimentation=909m2Selectclarifierdiameter=20mAreaofoneclarifier=314m2Min.clarifiernumber=3(provideadditionl1clarifierforstandby)Totalclarifierarea=942Actualoverflowrate=21m3/m2-dSelectclarifierdepth=4.0mSelectRASration=0.3CheckHRT=3.5hourChecksolidloadingrate=2.9kg/m2-hActivatedSludgeProcessDesignExample(withnitrification)1.DesignInformationFlowrateQ=20,000m3/d(averageday)InfluentBOD5S0=200mg/L(soluble)InfluentVSSX0=0mg/LEffluentBOD5Se=20mg/LEffluentSS=20mg/LEffluentVSSXe=13mg/LEffluentBOD5S=7.4mg/L(soluble)InfluentNH3-NSNH1=40mg/LEffluentNH3-NSNH=0mg/LGrowthyieldYH=0.5YA=0.22Decayratekd=0.06day-1MLVSS/MLSS=0.8WastedsludgeconcentrationXW=8,000mg/LPlantaltitude=100mDesigntemperatureT=25oC1-1.NitrificationEvaluationSelectm^A=0.75day-1C=2.0mg/LKOA=0.5mg/LbA=0.10day-1qX=10daysm^'A=m^AC/(KOA+C)=0.60day-1qmX=1/(m^'A-bA)=2.0fSA=qX/qmX=5.0Thusnitrificationhappens2.AerationBasinSelectMCRTqX=10daysSelectMLVSSX=2,000mg/LMLSS=2,500mg/LObservedyieldYobs=Y/(1+kdqX)=0.313IncreaseinVSSPXH=YobsQ(S0-S)=1,203kg/dReguiredbasinvolumeV=PXHqX/X=6,017m3SelectbasindepthD=5.0mReguiredbasinareaA=V/D=1,203m3SelectbasinlengthL=40mReguiredbasinwidthW=A/L=30m3SelectYA=0.22NeglectNcomsumedforcellsynthesisPXA=YAQNOX/(1+bAqX)=88kg/dPXT=PXH+PXA=1,291kg/dIncreaseinMLSSPXMT=1,614kg/dMassbalanceofwastedsludgePXMT=(Q-QW)SS+QWXWQW=(PXMT-QSS)/(XW-SS)=152m3/dSolidsinwastedsludge=1,217kg/dSolidslostineffluent=397kg/d3.OxygenandAirRequirementInfluentBODUSS1=294mg/LEffluentBODUSS=11mg/LThOR=Q(SS1-SS)+4.57Q(SNH1-SNH)-1.42PXT=7,485kg/dSelectCsw=9.08mg/LC'sw=8.24mg/LC=2.0mg/La=0.8b=0.9Fa=1-altitude/9450=0.99SOR=ThOR/[((C'swbFa–C)/Csw)(1.024)T-20a]=14,138kg/dAirdensityr=PM/RT=1.184kg/m3SelectOTE=25%SAR=[SOR/(r0.232)]/OTE=205,838m3/d=143m3/minSelectSF=1.5AR=SARxSF=214m3/min4.CircularSecondaryClarifierSelectoverflowrate=22m3/m2-dNecessaryareaforsedimentation=909m2Selectclarifierdiameter=20mAreaofoneclarifier=314m2Min.clarifiernumber=3(provideadditionl1clarifierforstandby)Totalclarifierarea=942Actualoverflowrate=21m3/m2-dSelectclarifierdepth=4.0mSelectRASration=0.3CheckHRT=3.5hourChecksolidloadingrate=2.9kg/m2-h5.AlkalinityRequirementSALK=7.07(SNH1-SNH)=283mg/LasCaCO3Alkalinitydemand=5,656kg/dasCaCO3