MLSS given RAS Pumping Rate from Aeration Tank Solution

STEP 0: Pre-Calculation Summary
Formula Used
MLSS = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average daily influent flow rate+Return Activated Sludge)
X = Xr*(Qr+Qw')/(Q+Qr)
This formula uses 5 Variables
Variables Used
MLSS - (Measured in Kilogram per Cubic Meter) - MLSS is the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics).
Sludge Concentration in Return Line - (Measured in Kilogram per Cubic Meter) - Sludge Concentration in Return Line is the total BOD that is present in the return line.
Return Activated Sludge - (Measured in Cubic Meter per Second) - Return activated sludge flow rate will vary with each installation and with different load factors.
WAS Pumping Rate from Return Line - (Measured in Cubic Meter per Second) - WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line.
Average daily influent flow rate - (Measured in Cubic Meter per Second) - Average daily influent flow rate is the total discharge that comes in the reactor.
STEP 1: Convert Input(s) to Base Unit
Sludge Concentration in Return Line: 200 Milligram per Liter --> 0.2 Kilogram per Cubic Meter (Check conversion here)
Return Activated Sludge: 50 Cubic Meter per Day --> 0.000578703703703704 Cubic Meter per Second (Check conversion here)
WAS Pumping Rate from Return Line: 300 Cubic Meter per Day --> 0.00347222222222222 Cubic Meter per Second (Check conversion here)
Average daily influent flow rate: 1.2 Cubic Meter per Day --> 1.38888888888889E-05 Cubic Meter per Second (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
X = Xr*(Qr+Qw')/(Q+Qr) --> 0.2*(0.000578703703703704+0.00347222222222222)/(1.38888888888889E-05+0.000578703703703704)
Evaluating ... ...
X = 1.3671875
STEP 3: Convert Result to Output's Unit
1.3671875 Kilogram per Cubic Meter -->1367.1875 Milligram per Liter (Check conversion here)
FINAL ANSWER
1367.1875 1367.187 Milligram per Liter <-- MLSS
(Calculation completed in 00.020 seconds)

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Meerut Institute of Engineering and Technology (MIET), Meerut
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4 MLSS and MLVSS Calculators

Mixed Liquor Volatile Suspended Solids given Reactor Volume
Go MLVSS = (Mean Cell Residence Time*Average daily influent flow rate*Maximum Yield Coefficient*(Influent Substrate Concentration-Effluent substrate concentration))/(Reactor Volume*(1+(Endogenous decay coefficient*Mean Cell Residence Time)))
Mixed Liquor Suspended Solids given Wasting Rate from Return Line
Go MLSS = Mean Cell Residence Time*((WAS Pumping Rate from Return Line*Sludge Concentration in Return Line)+(Effluent Flow Rate*Solid Concentration in Effluent))/Reactor Volume
MLSS given RAS Pumping Rate from Aeration Tank
Go MLSS = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average daily influent flow rate+Return Activated Sludge)
MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low
Go MLSS = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume

MLSS given RAS Pumping Rate from Aeration Tank Formula

MLSS = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average daily influent flow rate+Return Activated Sludge)
X = Xr*(Qr+Qw')/(Q+Qr)

What is aeration tank?

Aeration tank where air (or oxygen) is injected in the mixed liquor. Settling tank (usually referred to as "final clarifier" or "secondary settling tank") to allow the biological flocs (the sludge blanket) to settle, thus separating the biological sludge from the clear treated water.

How to Calculate MLSS given RAS Pumping Rate from Aeration Tank?

MLSS given RAS Pumping Rate from Aeration Tank calculator uses MLSS = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average daily influent flow rate+Return Activated Sludge) to calculate the MLSS, The MLSS given RAS pumping rate from aeration tank represents the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics). MLSS is denoted by X symbol.

How to calculate MLSS given RAS Pumping Rate from Aeration Tank using this online calculator? To use this online calculator for MLSS given RAS Pumping Rate from Aeration Tank, enter Sludge Concentration in Return Line (Xr), Return Activated Sludge (Qr), WAS Pumping Rate from Return Line (Qw') & Average daily influent flow rate (Q) and hit the calculate button. Here is how the MLSS given RAS Pumping Rate from Aeration Tank calculation can be explained with given input values -> 5.5E+6 = 0.2*(0.000578703703703704+0.00347222222222222)/(1.38888888888889E-05+0.000578703703703704).

FAQ

What is MLSS given RAS Pumping Rate from Aeration Tank?
The MLSS given RAS pumping rate from aeration tank represents the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics) and is represented as X = Xr*(Qr+Qw')/(Q+Qr) or MLSS = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average daily influent flow rate+Return Activated Sludge). Sludge Concentration in Return Line is the total BOD that is present in the return line, Return activated sludge flow rate will vary with each installation and with different load factors, WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line & Average daily influent flow rate is the total discharge that comes in the reactor.
How to calculate MLSS given RAS Pumping Rate from Aeration Tank?
The MLSS given RAS pumping rate from aeration tank represents the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics) is calculated using MLSS = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average daily influent flow rate+Return Activated Sludge). To calculate MLSS given RAS Pumping Rate from Aeration Tank, you need Sludge Concentration in Return Line (Xr), Return Activated Sludge (Qr), WAS Pumping Rate from Return Line (Qw') & Average daily influent flow rate (Q). With our tool, you need to enter the respective value for Sludge Concentration in Return Line, Return Activated Sludge, WAS Pumping Rate from Return Line & Average daily influent flow rate and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate MLSS?
In this formula, MLSS uses Sludge Concentration in Return Line, Return Activated Sludge, WAS Pumping Rate from Return Line & Average daily influent flow rate. We can use 2 other way(s) to calculate the same, which is/are as follows -
  • MLSS = Mean Cell Residence Time*((WAS Pumping Rate from Return Line*Sludge Concentration in Return Line)+(Effluent Flow Rate*Solid Concentration in Effluent))/Reactor Volume
  • MLSS = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume
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