Design Calculator | No 2

Estimation of sludge generation-chemical/ primary treatment process

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
In case of any invalid result of non-functioning of the calculator, please write to us at sales@dynamicequipments.co.in. We will try and help you with your sizing and calculation

INPUT

Parameter Value Unit Remarks
Plant capacity MLD
Raw effluent capacity of plant 41.7 cum/hr
Suspended Solids concentration before primary clarifier mg/l As per actual data from testing
Alum/ PAC dosing mg/l
Suspended Solids concentration after clarifier mg/l Assuming 85% reduction
Suspended Solidsremoval + PAC dosing 200 mg/l
Total amount of sludge generated 8.33 kg/hr
Consistency of sludge % Can range from 0.8-3% as per the detention and actual conditions, Typically 1% w/w
Density of sludge 1005 kg/cum
Quanity of sludge generated 0.83 cum/hr
Sludge generated as a percentage of Plant output 2.0 %
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