1.Design InformationFlow rate Q =Influent BOD5 S0=Influent VSS X0=Effluent BOD5 Se=Effluent SS =Effluent VSS Xe =Effluent BOD5 S =Influent NH3-N SNH1 =Effluent NH3-N SNH =Growth yield YH =
YA =
Decay rate kd =
0.50.220.06
day-1
8,000
o
20,000m3/d (average day)200mg/L (soluble)02020137.4
mg/Lmg/Lmg/Lmg/Lmg/L (soluble)400
mg/Lmg/L
MLVSS/MLSS =0.8
Wasted sludge concentration XW =Plant altitude =
100
m25
Design temperature T =
mg/L
C
1-1.Nitrification EvaluationSelectm^A =0.75day-1
C =
KOA =bA =qX =
qmX = 1/(m^'A - bA) =fSA = qX / qmX =2.Aeration BasinSelect MCRT qX =Select MLVSS X =5.02.00.50.1010mg/Lmg/Lday-1days0.602.0
Thus nitrification happens
day-1
m^'A = m^AC/(KOA + C) =
102,000daysmg/L0.313
MLSS =2,500mg/L
Observed yield Yobs = Y/(1 + kdqX) =
Increase in VSS PXH = YobsQ(S0 - S) =1,203kg/dReguired basin volume V = PXHqX/X =6,017m3Select basin depth D =5.0
mReguired basin area A = V/D =1,203m3Select basin length L =40mReguired basin width W = A/L =30
m3
SelectYA =0.22Neglect N comsumed for cell synthesisPXA = YA Q NOX / (1 + bAqX) =88kg/dPXT = PXH + PXA =
1,291
kg/d
Increase in MLSS PXMT =1,614
kg/d
Mass balance of wasted sludgePXMT = (Q - QW)SS + QWXWQW = (PXMT - Q SS)/(XW - SS) =152m3/d
Solids in wasted sludge =1,217kg/dSolids lost in effluent =
397kg/d
3.Oxygen and Air RequirementInfluent BODU SS1=294mg/LEffluent BODU SS =11mg/L
ThOR = Q(SS1 - SS) + 4.57 Q(SNH1-SNH) - 1.42 PXT =
Select
Csw =9.08mg/LC'sw =8.24mg/LC =2.0mg/L
a =
0.8
b =0.9
Fa = 1 - altitude/9450 =0.99
SOR = ThOR / [((C'swbFa – C)/Csw) (1.024)T-20 a] =
Air density r = PM/RT =1.184kg/m3
Select OTE =25%
SAR = [SOR/(r 0.232)]/OTE =
205,838m3/d =
Select SF =1.5AR = SAR x SF =
214
m3/min
4.Circular Secondary ClarifierSelect overflow rate =
22
m3
/m2
-dNecessary area for sedimentation =
909
m
2
7,485
kg/d
kg/d
143
m3/min
14,138Select clarifier diameter =Area of one clarifier =Min. clarifier number =Total clarifier area =Actual overflow rate =Select clarifier depth =Select RAS ration =Check HRT =
3.5
Check solid loading rate =5.Alkalinity RequirementSALK = 7.07(SNH1 - SNH) =Alkalinity demand =
203143942214.00.3hour2.9
2835,656
mm2
(provide additionl 1 clarifier for standby)m3/m2-dm
kg/m2-h
mg/L as CaCO3kg/d as CaCO3
因篇幅问题不能全部显示，请点此查看更多更全内容