✖Sludge Concentration in Return Line is the total BOD that is present in the return line.ⓘ Sludge Concentration in Return Line [X_r]			+10% -10%
✖Return activated sludge flow rate will vary with each installation and with different load factors.ⓘ Return Activated Sludge [Q_r]			+10% -10%
✖WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line.ⓘ WAS Pumping Rate from Return Line [Q_w']			+10% -10%
✖Average Daily Influent Flow Rate is the average volume of wastewater entering a treatment facility per day. This is crucial because it helps determine the efficiency of wastewater treatment plants.ⓘ Average Daily Influent Flow Rate [Q^']			+10% -10%

✖Mixed Liquor Suspended Solids refers to the concentration of suspended solids in the mixed liquor of an aeration tank during the activated sludge process.ⓘ MLSS given RAS Pumping Rate from Aeration Tank [X^']

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Formula

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MLSS given RAS Pumping Rate from Aeration Tank

Formula

`"X"^{"'"} = "X"_{"r"}*("Q"_{"r"}+("Q"_{"w"}"'"))/("Q"^{"'"}+"Q"_{"r"})`

Example

`"1162.791mg/L"="200mg/L"*("50m³/d"+"300m³/d")/("10.2m³/d"+"50m³/d")`

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MLSS given RAS Pumping Rate from Aeration Tank Solution

STEP 0: Pre-Calculation Summary

Formula Used

Mixed Liquor Suspended Solids = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average Daily Influent Flow Rate+Return Activated Sludge)
X^' = X_r*(Q_r+Q_w')/(Q^'+Q_r)
This formula uses 5 Variables

Variables Used

Mixed Liquor Suspended Solids - (Measured in Kilogram per Cubic Meter) - Mixed Liquor Suspended Solids refers to the concentration of suspended solids in the mixed liquor of an aeration tank during the activated sludge process.
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 average volume of wastewater entering a treatment facility per day. This is crucial because it helps determine the efficiency of wastewater treatment plants.

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: 10.2 Cubic Meter per Day --> 0.000118055555555556 Cubic Meter per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

X^' = X_r*(Q_r+Q_w')/(Q^'+Q_r) --> 0.2*(0.000578703703703704+0.00347222222222222)/(0.000118055555555556+0.000578703703703704)

Evaluating ... ...

X^' = 1.16279069767442

STEP 3: Convert Result to Output's Unit

1.16279069767442 Kilogram per Cubic Meter -->1162.79069767442 Milligram per Liter (Check conversion here)

FINAL ANSWER

1162.79069767442 ≈ 1162.791 Milligram per Liter <-- Mixed Liquor Suspended Solids

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Environmental Engineering » Design of a Complete Mix Activated Sludge Reactor » MLSS and MLVSS » MLSS given RAS Pumping Rate from Aeration Tank

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< 4 MLSS and MLVSS Calculators

Mixed Liquor Volatile Suspended Solids given Reactor Volume

Go Mixed Liquor Volatile Suspended Solids = (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 Mixed Liquor Suspended Solids = 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 Mixed Liquor Suspended Solids = 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 Mixed Liquor Suspended Solids = 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

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 Mixed Liquor Suspended Solids = 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 Mixed Liquor Suspended Solids, The MLSS given RAS Pumping Rate from Aeration Tank Formula is defined as the concentration of suspended solids in the mixed liquor of an aeration tank in a wastewater treatment plant using RAS pumping rate as it is crucial for controlling the MLSS concentration in the aeration tank. Mixed Liquor Suspended Solids 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 (X_r), Return Activated Sludge (Q_r), WAS Pumping Rate from Return Line (Q_w') & 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 -> 1.2E+6 = 0.2*(0.000578703703703704+0.00347222222222222)/(0.000118055555555556+0.000578703703703704).

FAQ

What is MLSS given RAS Pumping Rate from Aeration Tank?

The MLSS given RAS Pumping Rate from Aeration Tank Formula is defined as the concentration of suspended solids in the mixed liquor of an aeration tank in a wastewater treatment plant using RAS pumping rate as it is crucial for controlling the MLSS concentration in the aeration tank and is represented as X^' = X_r*(Q_r+Q_w')/(Q^'+Q_r) or Mixed Liquor Suspended Solids = 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 average volume of wastewater entering a treatment facility per day. This is crucial because it helps determine the efficiency of wastewater treatment plants.

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

The MLSS given RAS Pumping Rate from Aeration Tank Formula is defined as the concentration of suspended solids in the mixed liquor of an aeration tank in a wastewater treatment plant using RAS pumping rate as it is crucial for controlling the MLSS concentration in the aeration tank is calculated using Mixed Liquor Suspended Solids = 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 (X_r), Return Activated Sludge (Q_r), WAS Pumping Rate from Return Line (Q_w') & 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 Mixed Liquor Suspended Solids?

In this formula, Mixed Liquor Suspended Solids 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 -

Mixed Liquor Suspended Solids = Mean Cell Residence Time*((WAS Pumping Rate from Return Line*Sludge Concentration in Return Line)+(Effluent Flow Rate*Solid Concentration in Effluent))/Reactor Volume
Mixed Liquor Suspended Solids = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume

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