Name of STP: STUDENT
Measured Parameters mg/L
BODo= 321
sBODo= 161
CODo= 600.00
sCODo= Si +Ss = 180
rbCODo= Ss = 90.0
bCOD/BODo= 1.6
VSS%= 65.0%
Recirculating rate at average flow 0.75
Chosen M LSS = 3400
Calculated Parameters
bCODo= sbCOD + rbCOD=Ss + Xs + Xp = 514
sCODeff= Si = sCOD - bCOD = -77
biodegradab particul COD bpCOD= Xs + Xp = bCOD/BODo*(BODo-sBOD) 257
particulate COD pCOD= Xs + Xp + Xi = CODo-sCODo 420
VSS= 228.8
nonbiodegradable VSS nbVSS= 88.9
iTSS = TSS-VSS= 123.2
Return sludge concentration, M LSS 7933.3
rbCOD/bCOD= 0.18
Select rbCOD/bCOD= 0.20
Aeration Tank
Aerobic Sludge Age (t-DS) µn = (µm,n x NH 4Neff / (Kn + N) x (DO / Ko+DO) - kd
Kinetic parameters
µm,n , selected 0.75 g VSS/g VSS.d
µm,n,T 0.44 g VSS/g VSS.d
Kn, selected 0.74 g NH4-N/m2
Kn,T 0.49 g NH4-N/m3
kdn, selected 0.08 g VSS/g VSS.d
kdn,T 0.06 g VSS/g VSS.d
kd, selected 0.12 g VSS/g VSS.d
kd,T 0.088 g VSS/g VSS.d
Sludge Production = Biomass Production (Pxbio) = Xb
Px,bio=((Q * Y *(So-S)) / (1 + kd * SRTa)) + ((Q*fd * kd * Y (So-S) *SRTa) / (1 + kd* SRTa)) + (Q * Yn *N
Kinetic parameters
kd, selected 0.12 g VSS/g VSS.d
kd,T 0.088 g VSS/g VSS.d
Sludge Production = Biomass Production (Pxbio) = Xb
Px,bio=((Q * Y *(So-S)) / (1 + kd * SRTa)) + ((Q*fd * kd * Y (So-S) *SRTa) / (1 + kd* SRTa)) + (Q * Yn *N
Kinetic parameters
Y, selected 0.4 g VSS/g bCOD
fd, selected 0.15 -
Yn, selected 0.12 g VSS/g NH4_N Biologic
Ks, selected 20.0 g bCOD/m3
VSS (Assuming bpCOD/pCOD = bpVSS/pVSS)
nbVSS = (1 - (bpCOD / pCOD))*VSS nbVSS =
Px,vss=Px,bio + (nbVSS x Q) / 1000 Px,vss = 4
TSS
Px,tss=Px,bio / VSSperc + (Q*nbVSS ) + Q *(TSSo - VSSo)
Sludge production, Px,tss = 9,0
MLVSS/MLSS = 0
Voxic
Voxic = (Px,tss + PxPO4) x SRTa/ MLSS
Sludge production from Phosphate Precipitation
Pxtotal= Total sludge production 9,0
Va=V-oxic = 15,
Va= Oxic Volume, selected = 15,1
Nitrogen to be , Nitrified =NN = NOx
NN = NOx = TKNo - (NH4Neff +org Neff)- 0.12 x Pxbio / Q
WASN= XorgNWAS= 0.12 x Pxbio / Q=
S-NH4N = NN = NOx=Nitrogen to be nitrified= 48
97
Nitrogen to be Denitrified= NDN = S_NO3,D = DNcapacity
S-NO3,D = NN - NO3Neff = TKNo-TKNeff-WASN +(NO3No-NO3Neff)
NO3Neff=
DN capacity = NO3N to be DN=S-NO3,D = 4
83
Internal Recirculating Rate, IR
IR = NOx / NO3Neff - 1 - R =
Selected IR =
NO3N fed into anoxic tank = Q*(Rr+IR)*NO3Neff/1000 = 83
Anoxic volume
Internal Recirculating Rate, IR
IR = NOx / NO3Neff - 1 - R =
Selected IR =
NO3N fed into anoxic tank = Q*(Rr+IR)*NO3Neff/1000 = 83
Anoxic volume
Selected Retention time =
Anoxic volume, required 3
Anoxic volume, selected 3
F/Mb
Xb = MLVSSbiomass = Q x SRTa / Vaerobic * Y (S0-S) / (1+ kd x SRTa)
MLVSSbiomass =Xb= 1
F/Mb = (Q x S0) / ( Xb * Vd) = F/M b = 1.
Specific Nitrate Removal Rate:
SDNR at 20 o C (read from Fig. 8- 23 ) 0
SDNR at T o C = SDNR20*1.026^(Tmin-20)= 0
Amount of NitrateN that can be reduced = NOr
NOr = SDNR *Xb *Vd Nitrate removed = 83
Capacity Ratio= NO3N that can be removed / No3N fed into Anoxic tank= 1
Aeration Tank Volume
V-aerobic 15,151 m³
V-anoxic 3,862 m³
V-total 19,013.6 m³
V-total 19,013.6 m³
V-anoxic/V-total 0.203 -
F/M ratio 0.101 kgBOD/kgMLSS/
22.449 h
Total sludge age = 7.13 d
Vtotal= 19,014 m³
VD/VT= 0.20
F/M ratio = kgBOD/kgM LSS/d 0.101
tR= 22.4 h
SRTtotal= 7.1 d
Tank quantity 2.000 nos.
3
Tank volume 9,507 m
Water depth 6.000 m
Tank surface, each = 1,584.469
Net tank width 9.300
Diameter of the round parts 9.300
M iddle wall length 33.750
Total tank length 43.050
Tank quantity 2.000 nos.
3
Tank volume 9,507 m
Water depth 6.000 m
Tank surface, each = 1,584.469
Net tank width 9.300
Diameter of the round parts 9.300
M iddle wall length 33.750
Total tank length 43.050
mg/L Selected % Advisable Results
Advisable % values
321
161 50.0% 50% 160.5
600.00 COD/BOD= 1.87
180 30.0% 30% 180
90.0 15.0% 15% 90
1.6
65.0% 85%
0.75 % 0.75
3400 mg/lt
s + Xp = 514 85.6%
-77 -12.8%
ODo-sBOD) 257 42.8% 27%
CODo 420 70.0% 40%
228.8
88.9
123.2
7933.3 mg/lt
0.18
0.20
A max NH 4 Neff DO
A 1.103(tc 1
n + N) x (DO / Ko+DO) - kdn HSG SFN K n NH 4 Neff 1 DO
Ko, selected 0.50 mg/L
2.00
Dissolved Oxygen, selected mg/L
C-NH4,OA= NH4Neff=1.00 mg/L
SF = 1.000 TKNpeak/TKNaver= 2.75 SR
Specific growth rate for nitrifying organisms (µ,n) 0.176
Aerobic sludge age, (t-DS) 5.68 kg/kg*d
Aerobic sludge age, selected = SRTa = 5.68 kg/kg*d
A. Biological
ATV SRTa= 6.62
Effluent BOD Concentr
= Xb
(1 + kd* SRTa)) + (Q * Yn *NOx / (1 + Kdn * SRTa))
S = Ks x (1 + kd x SRT) / (SRT x (µm - kd) -1)
Aerobic sludge age, (t-DS) 5.68 kg/kg*d
Aerobic sludge age, selected = SRTa = 5.68 kg/kg*d
A. Biological
ATV SRTa= 6.62
Effluent BOD Concentr
= Xb
(1 + kd* SRTa)) + (Q * Yn *NOx / (1 + Kdn * SRTa))
S = Ks x (1 + kd x SRT) / (SRT x (µm - kd) -1)
µm , selected = 6.0 g VSS/g VSS.d
VSS/g bCOD µm,T = 3.5 g VSS/g VSS.d
- S= 1.63 mg/l
SS/g NH4_N Biologic Sludge Production=
g bCOD/m3 Xb = Pxbio = 3,090 kg VSS/d
Px ,bio QYH
nbVSS = 88.9 mg/l 0.252571429
Px,vss = 4,897 kg/d
M &E Yobs
YobsH= (0,75+0,6(SS/BOD)-((1-0,2)*0,17*0,75*SRT*FT)/
(Pxbio/VSSperc)/((Q*BODo-S)/1000) = 0.732
ss = 9,066 kg/d 9,066 kg/d
SS/MLSS = 0.540 (1-bpCOD/pCOD)*VSSperc+(1-VSSperc) = 0.603
Choose VdVt= 0.5
SRTt= 11 d
- kg/d Ft= 0.814
9,066 kg/d ER= 3.6
Va=V-oxic = 15,151 m³ M&E YobsH= 1.396
selected = 15,151 m³ ATV Yobs= 1.05
PxTSS M&E = 9,066
PxT (M&E)= 9,066
x Pxbio / Q= 18.2 mg/l PxT-ATV= 6,824
be nitrified= 48.16 mg/l
978.9 kg/d
pacity
-NO3Neff)
NO3Neff= 7 mg/l
=S-NO3,D = 41.2 mg/l
836.6 kg/d
5.13 %
lected IR = 5.13 %
000 = 836.6 kgNO3/d 0.011x 3 - 0.085x 2 + 0.305x
rbCOD/bCOD SDNR@20C (power fit) 1, OK
15,151 m³
3,862 m³
19,013.6 m³
19,013.6 m³
0.203 -
0.101 kgBOD/kgMLSS/d
22.449 h
7.13 d
19,014 m³
0.20
0.101
22.4 h
7.1 d
2.000 nos.
3
9,507 m
6.000 m
1,584.469
9.300
9.300
33.750
43.050
2.000 nos.
3
9,507 m
6.000 m
1,584.469
9.300
9.300
33.750
43.050
Neff DO
1.103(tc 15)
4 Neff 1 DO
2.75 SRT %of BOD Load
=20 3.50%
5.68 kg/kg*d
5.68 kg/kg*d
A. Biological Sludge Production (Px,bio)
6.62
Effluent BOD Concentrations, S:
(1 bH ,T SRTa )
S Ks
SRTa ( H ,T bH ,T ) 1
5.68 kg/kg*d
5.68 kg/kg*d
A. Biological Sludge Production (Px,bio)
6.62
Effluent BOD Concentrations, S:
(1 bH ,T SRTa )
S Ks
SRTa ( H ,T bH ,T ) 1
bH,T = bH,20(1.04)T-20
H ,T H , 20 (1.07) T 20
(S 0 S ) SRTa ( S 0 S ) NO X
Px ,bio QYH QYH f d bH ,T QY A
1 bH ,T SRTa 1 bH ,T SRTa (1 b A,T SRTa )
PX,H PX-particulates PX,A
formed from decay
of heterotrophs
NOX = Oxidized TKN = TKNin - TKNeff – 0.12(Px,bio/Q)
(1-0,2)*0,17*0,75*SRT*FT)/ TKNoxid XorgN,WAS
-S)/1000) = 0.732
c+(1-VSSperc) = 0.603
0.5
11 d
0.814
3.6
1.396 1.389
1.05
9,066
9,066
6,824
x 3 - 0.085x 2 + 0.305x
@20C (power fit)<2 SDNR@20C (ln fit)
x 3 - 0.085x 2 + 0.305x
@20C (power fit)<2 SDNR@20C (ln fit)
0.226
0.256
0.285
0.318 0.328
0.328