Design Calculator | No 4
Estimation of Sludge Weight after dewatering
Calculator
(Note – all Yellow are user defined value, all white are fixed values, all green are calculated value, all orange is calculated not to be shown)
Instructions
Enter values highlighted in the Yellow
Green highlights are the results
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INPUT
| Parameter | Value | Unit | Remarks |
|---|---|---|---|
| Solids feed rate | cum/hr | ||
| Feed solids concentration | %w/w | ||
| Feed solids concentration | 10 | g/cum | |
| Cake moisture content | % | ||
| Design calculations | |||
| Solids feed | 100 | kg/hr | In dry basis |
| Cake solids content | 25 | % | |
| Sludg cake weight after dewatering | 400 | kg/hr | |
| Summary of result | |||
| Sludg cake weight after dewatering | 400 | kg/hr | |
| Volume reduction | 96.00 | % | |
| Initial volume | 10000 | cum | |
| Final volume | 400.0 | cum | |
| Note: The volume can be more accurate if adjusted for specific gravity of solids | |||
| TABLE-1 AERATION TANK DESIGN DATA (BIOKINETIC COEFFICIENT) | |||||||
| Reference: CPHEEO & Metcalf & Eddy Edition-4, Section 8-3, Table-8.11, Page-705 | |||||||
| Biokinetic parameter at 20 C | |||||||
| Description | Parameters | Units | COD oxidation | NH4 oxidation | NO2 oxidation | ||
| Maxiumum Specific Growth rate | µ_max | g bsCOD/g VSS.d | 6.00 | 0.9 | 1 |  |
|
| Half Velocity Constant | K_s /K_nh4 /K_no2 | mg/L | 8 | 0.5 | 0.2 | ||
| Synthesis yield | Y | mg VSS/mg sustrate | 0.45 | 0.15 | 0.05 | ||
| Specific Endogenous Decay Rate | b | g VSS/g VSS.d | 0.12 | 0.17 | 0.17 | ||
| Fraction of Biomass that remain as cell debris | f_d | unitless | 0.15 | 0.15 | 0.15 | ||
| Half Velocity Constant for Oxygen | K_o2 | mg/L | 0.2 | 0.5 | 0.9 | ||
| Temperature correction coeffcients for biokinetci parameters | |||||||
 |
Theta value | Units | COD oxidation | NH4 oxidation | NO2 oxidation | ||
| µ_max | unitless | 1.07 | 1.072 | 1.063 | |||
| b | unitless | 1.04 | 1.029 | 1.029 | |||
| K_s /K_nh4 /K_no2 | unitless | 1 | 1 | 1 | |||
| Temperature | Err:509 | deg C | |||||
| Biokinetic parameter at T deg C | |||||||
| Description | Parameters | Units | COD oxidation | NH4 oxidation | NO2 oxidation | ||
| Maxiumum Specific Growth rate | µ_max | g bsCOD/g VSS.d | 0.00 | 0.000 | 0.00 | ||
| Half Velocity Constant | K_s /K_nh4 /K_no2 | mg/L | 0 | 0 | 0 | ||
| Synthesis yield | Y | mg VSS/mg sustrate | 0.45 | 0.15 | 0.05 | ||
| Specific Endogenous Decay Rate | b | g VSS/g VSS.d | 0.000 | 0.000 | 0.000 | ||
| Fraction of Biomass that remain as cell debris | f_d | unitless | 0.15 | 0.15 | 0.15 | ||
| Half Velocity Constant for Oxygen | K_o2 | mg/L | 0.2 | 0.5 | 0.9 | ||
| Biokinetic parameter at 20 C (Range of values) | |||||||
| Description | Parameters | Units | Range | Typical | |||
| maximum specific sustrate utilization rate | k | g bsCOD/g VSS.d | 4-12 | 6 | |||
| half velocity constant | Ks | mg/L BOD | 20-60 | 30 | |||
| mg/L bsCOD | 5-30 | 15 | |||||
| sysntesis yield coeficient | Y | mg VSS/mg BOD | 0.4-0.8 | 0.6 | |||
| mg VSS/mg COD | 0.4-0.6 | 0.45 | |||||
| decay coeficient | b | g VSS/g VSS.d | 0.06-0.15 | 0.1 | |||
| TABLE-2 AERATION TANK DESIGN DATA (NITRIFICATION FLUX IN BIOFILM) | |||||||
| Reference: Metcalf & Eddy Edition-5, Table-9.25, Page-1007 | |||||||
| Nitrification Flux (g NH4-N/sqm-day) | DO (mg/l) | Bulk liquid NH4-N, mg/l | |||||
| 1.07 | 4 | 1 | |||||
| 0.9 | 3 | 0.8 | |||||
| 0.6 | 2 | 0.5 | |||||
| TABLE-3 AERATION TANK DESIGN DATA (Design range of air veloicty in header pipe for Fine Bubble Membrane diffusers ) | |||||||
| Reference: Metcalf & Eddy Edition-5, Table-9.25, Page-1007 | |||||||
| Pipe Diameter (inch) | Pipe Diameter (mm) | Velocity (m/min) | |||||
| 1-3 | 75-225 | 360-540 | |||||
| 4-10 | 100-250 | 540-900 | |||||
| 12-24 | 300-600 | 800-1200 | |||||
| 30-60 | 750-1500 | 1100-2000 | |||||
| TABLE-1 AERATION TANK DESIGN DATA (BIOKINETIC COEFFICIENT) |
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|
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| Reference: CPHEEO & Metcalf & Eddy Edition-4, Section 8-3, Table-8.11, Page-705 |
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| Biokinetic parameter at 20 C |
||||||||
| Description |
Parameters |
Units |
COD oxidation |
NH4 oxidation |
NO2 oxidation |
|||
| Maxiumum Specific Growth rate |
µ_max |
g bsCOD/g VSS.d |
6.00 |
0.9 |
1 |
µ_max = k * Y |
||
| Half Velocity Constant |
K_s /K_nh4 /K_no2 |
mg/L |
8 |
0.5 |
0.2 |
|||
| Synthesis yield | Y | mg VSS/mg sustrate |
0.45 | 0.15 |
0.05 | |||
| Specific Endogenous Decay Rate | b | g VSS/g VSS.d | 0.12 | 0.17 | 0.17 | |||
| Fraction of Biomass that remain as cell debris | f_d | unitless |
0.15 |
0.15 |
0.15 |
|||
| Half Velocity Constant for Oxygen | K_o2 | mg/L | 0.2 |
0.5 | 0.9 | |||
| Temperature correction coeffcients for biokinetci parameters | ||||||||
|
| Theta value | Units | COD oxidation | NH4 oxidation | NO2 oxidation | |||
| µ_max | unitless | 1.07 | 1.072 | 1.063 | ||||
| b |
unitless |
1.04 |
1.029 |
1.029 | ||||
| K_s /K_nh4 /K_no2 |
unitless |
1 |
1 |
1 |
||||
| Temperature dependability of biokinetics coefficient |
||||||||
| Temperature |
25 | deg C | ||||||
| Biokinetic parameter at T deg C | ||||||||
| Description | Parameters |
Units | COD oxidation | NH4 oxidation | NO2 oxidation | |||
|
8.42 1.274 1.36 8 0.5 0.2 0.45 0.15 0.05 0.146 0.196 0.196 0.15 0.15 0.15 0.2 0.5 0.9 6 30 15 0.6 0.45 0.1 4 3 2 1 0.8 0.5 |
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|
Maxiumum Specific Growth rate |
µ_max |
g bsCOD/g VSS.d |
6.87 |
1.034 |
1.13 |
|||
|
Half Velocity Constant |
K_s /K_nh4 /K_no2 |
mg/L |
8 |
0.5 |
0.2 |
|||
|
Synthesis yield |
Y |
mg VSS/mg sustrate |
0.45 |
0.15 |
0.05 |
|||
|
Specific Endogenous Decay Rate |
b |
g VSS/g VSS.d |
0.130 |
0.180 |
0.180 |
|||
|
Fraction of Biomass that remain as cell debris |
f_d |
unitless |
0.15 |
0.15 |
0.15 |
|||
|
Half Velocity Constant for Oxygen |
K_o2 |
mg/L |
0.2 |
0.5 |
0.9 |
|||
|
Biokinetic parameter at 20 C (Range of values) |
||||||||
|
Description |
Parameters |
Units |
Range |
Typical |
||||
|
maximum specific sustrate utilization rate |
k |
g bsCOD/g VSS.d |
4-12 |
6 |
||||
|
half velocity constant |
Ks |
mg/L BOD |
20-60 |
30 |
||||
|
|
|
mg/L bsCOD |
5-30 |
15 |
||||
|
sysntesis yield coeficient |
Y |
mg VSS/mg BOD |
0.4-0.8 |
0.6 |
||||
|
|
|
mg VSS/mg COD |
0.4-0.6 |
0.45 |
||||
|
decay coeficient |
b |
g VSS/g VSS.d |
0.06-0.15 |
0.1 |
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