MLSS given volume of Aeration Tank Calculator

✖Maximum Yield Coefficient Y represents the maximum mg of cells produced per mg organic matter removed.ⓘ Maximum Yield Coefficient [Y]			+10% -10%
✖Sewage discharge is the flow rate of sewage when it is being discharged in the river.ⓘ Sewage Discharge [Q_s]			+10% -10%
✖Influent BOD is the total amount of BOD which is present in the incoming sewage.ⓘ Influent BOD [Q_i]			+10% -10%
✖Effluent BOD is the amount of BOD present in the outing sewage.ⓘ Effluent BOD [Q_o]			+10% -10%
✖Sludge Age is the average time for which the particle of suspended solids remains in aeration.ⓘ Sludge Age [θ_c]			+10% -10%
✖Volume of tank is defined as the capacity of flocculation and mixing tank.ⓘ Volume of Tank [V]			+10% -10%
✖Endogenous Respiration Rate Constant is used for designing a complete-mix activated-sludge system.ⓘ Endogenous Respiration Rate Constant [K^e]			+10% -10%

✖MLSS is the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics).ⓘ MLSS given volume of Aeration Tank [X]

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Formula

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MLSS given volume of Aeration Tank

Formula

`"X" = ("Y"*"Q"_{"s"}*("Q"_{"i"}-"Q"_{"o"})*"θ"_{"c"})/("V"*(1+"K"^{"e"}*"θ"_{"c"}))`

Example

`"1200mg/L"=("0.5"*"10m³/s"*("0.48mg/L"-"0.4mg/L")*"5d")/("9m³"*(1+"3d⁻¹"*"5d"))`

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MLSS given volume of Aeration Tank Solution

STEP 0: Pre-Calculation Summary

Formula Used

MLSS = (Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(Volume of Tank*(1+Endogenous Respiration Rate Constant*Sludge Age))
X = (Y*Q_s*(Q_i-Q_o)*θ_c)/(V*(1+K^e*θ_c))
This formula uses 8 Variables

Variables Used

MLSS - (Measured in Kilogram per Cubic Meter) - MLSS is the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics).
Maximum Yield Coefficient - Maximum Yield Coefficient Y represents the maximum mg of cells produced per mg organic matter removed.
Sewage Discharge - (Measured in Cubic Meter per Second) - Sewage discharge is the flow rate of sewage when it is being discharged in the river.
Influent BOD - (Measured in Kilogram per Cubic Meter) - Influent BOD is the total amount of BOD which is present in the incoming sewage.
Effluent BOD - (Measured in Kilogram per Cubic Meter) - Effluent BOD is the amount of BOD present in the outing sewage.
Sludge Age - (Measured in Second) - Sludge Age is the average time for which the particle of suspended solids remains in aeration.
Volume of Tank - (Measured in Cubic Meter) - Volume of tank is defined as the capacity of flocculation and mixing tank.
Endogenous Respiration Rate Constant - (Measured in 1 Per Second) - Endogenous Respiration Rate Constant is used for designing a complete-mix activated-sludge system.

STEP 1: Convert Input(s) to Base Unit

Maximum Yield Coefficient: 0.5 --> No Conversion Required
Sewage Discharge: 10 Cubic Meter per Second --> 10 Cubic Meter per Second No Conversion Required
Influent BOD: 0.48 Milligram per Liter --> 0.00048 Kilogram per Cubic Meter (Check conversion here)
Effluent BOD: 0.4 Milligram per Liter --> 0.0004 Kilogram per Cubic Meter (Check conversion here)
Sludge Age: 5 Day --> 432000 Second (Check conversion here)
Volume of Tank: 9 Cubic Meter --> 9 Cubic Meter No Conversion Required
Endogenous Respiration Rate Constant: 3 1 Per Day --> 3.47222222222222E-05 1 Per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

X = (Y*Q_s*(Q_i-Q_o)*θ_c)/(V*(1+K^e*θ_c)) --> (0.5*10*(0.00048-0.0004)*432000)/(9*(1+3.47222222222222E-05*432000))

Evaluating ... ...

X = 1.2

STEP 3: Convert Result to Output's Unit

1.2 Kilogram per Cubic Meter -->1200 Milligram per Liter (Check conversion here)

FINAL ANSWER

1200 Milligram per Liter <-- MLSS

(Calculation completed in 00.020 seconds)

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Home » Engineering » Civil » Environmental Engineering » Treatment of Sewage » Size and Volume of the Aeration Tank » MLSS given volume of Aeration Tank

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Created by Suraj Kumar

Birsa Institute of Technology (BIT), Sindri

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Verified by Ishita Goyal

Meerut Institute of Engineering and Technology (MIET), Meerut

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< 8 Size and Volume of the Aeration Tank Calculators

Sludge Age given Volume of Aeration Tank

Go Sludge Age = (Volume of Tank*MLSS)/(Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)-Volume of Tank*MLSS*Endogenous Respiration Rate Constant)

Endogenous Respiration Rate Constant given Volume of Aeration Tank

Go Endogenous Respiration Rate Constant = (((Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(Volume of Tank*MLSS))-1)/Sludge Age

Maximum Yield Coefficient given Volume of Aeration Tank

Go Maximum Yield Coefficient = Volume of Tank/((Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(MLSS*(1+Endogenous Respiration Rate Constant*Sludge Age)))

Sewage Discharge given Volume of Aeration Tank

Go Sewage Discharge = Volume of Tank/((Maximum Yield Coefficient*(Influent BOD-Effluent BOD)*Sludge Age)/(MLSS*(1+Endogenous Respiration Rate Constant*Sludge Age)))

Influent BOD given Volume of Aeration Tank

Go Influent BOD = Effluent BOD+((Volume of Tank*MLSS*(1+Endogenous Respiration Rate Constant*Sludge Age))/(Maximum Yield Coefficient*Sewage Discharge*Sludge Age))

Effluent BOD given Volume of Aeration Tank

Go Effluent BOD = Influent BOD-((Volume of Tank*MLSS*(1+Endogenous Respiration Rate Constant*Sludge Age))/(Maximum Yield Coefficient*Sewage Discharge*Sludge Age))

MLSS given volume of Aeration Tank

Go MLSS = (Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(Volume of Tank*(1+Endogenous Respiration Rate Constant*Sludge Age))

Volume of Aeration Tank

Go Volume of Tank = (Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(MLSS*(1+Endogenous Respiration Rate Constant*Sludge Age))

MLSS given volume of Aeration Tank Formula

What is MLSS ?

Mixed liquor suspended solids (MLSS) is the concentration of suspended solids, in an aeration tank during the activated sludge process, which occurs during the treatment of waste water.

How to Calculate MLSS given volume of Aeration Tank?

MLSS given volume of Aeration Tank calculator uses MLSS = (Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(Volume of Tank*(1+Endogenous Respiration Rate Constant*Sludge Age)) to calculate the MLSS, MLSS given volume of Aeration Tank is defined as the value of MLSS when we have prior information of other parameters used. MLSS is denoted by X symbol.

How to calculate MLSS given volume of Aeration Tank using this online calculator? To use this online calculator for MLSS given volume of Aeration Tank, enter Maximum Yield Coefficient (Y), Sewage Discharge (Q_s), Influent BOD (Q_i), Effluent BOD (Q_o), Sludge Age (θ_c), Volume of Tank (V) & Endogenous Respiration Rate Constant (K^e) and hit the calculate button. Here is how the MLSS given volume of Aeration Tank calculation can be explained with given input values -> 1.6E+8 = (0.5*10*(0.00048-0.0004)*432000)/(9*(1+3.47222222222222E-05*432000)).

FAQ

What is MLSS given volume of Aeration Tank?

MLSS given volume of Aeration Tank is defined as the value of MLSS when we have prior information of other parameters used and is represented as X = (Y*Q_s*(Q_i-Q_o)*θ_c)/(V*(1+K^e*θ_c)) or MLSS = (Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(Volume of Tank*(1+Endogenous Respiration Rate Constant*Sludge Age)). Maximum Yield Coefficient Y represents the maximum mg of cells produced per mg organic matter removed, Sewage discharge is the flow rate of sewage when it is being discharged in the river, Influent BOD is the total amount of BOD which is present in the incoming sewage, Effluent BOD is the amount of BOD present in the outing sewage, Sludge Age is the average time for which the particle of suspended solids remains in aeration, Volume of tank is defined as the capacity of flocculation and mixing tank & Endogenous Respiration Rate Constant is used for designing a complete-mix activated-sludge system.

How to calculate MLSS given volume of Aeration Tank?

MLSS given volume of Aeration Tank is defined as the value of MLSS when we have prior information of other parameters used is calculated using MLSS = (Maximum Yield Coefficient*Sewage Discharge*(Influent BOD-Effluent BOD)*Sludge Age)/(Volume of Tank*(1+Endogenous Respiration Rate Constant*Sludge Age)). To calculate MLSS given volume of Aeration Tank, you need Maximum Yield Coefficient (Y), Sewage Discharge (Q_s), Influent BOD (Q_i), Effluent BOD (Q_o), Sludge Age (θ_c), Volume of Tank (V) & Endogenous Respiration Rate Constant (K^e). With our tool, you need to enter the respective value for Maximum Yield Coefficient, Sewage Discharge, Influent BOD, Effluent BOD, Sludge Age, Volume of Tank & Endogenous Respiration Rate Constant and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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