活性污泥法设计

活性污泥法设计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/