✖Mean Cell Residence Time is the average time that the sludge remains in the reactor.ⓘ Mean Cell Residence Time [θ_c]			+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%
✖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%
✖The Reactor Volume gives us the capacity of the reactor.ⓘ Reactor Volume [V]			+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 using Wasting rate from Return Line when Concentration of Solid in Effluent is Low [X^']

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MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low

Formula

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

Example

`"840mg/L"="14d"*"300m³/d"*"200mg/L"/"1000m³"`

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MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low Solution

STEP 0: Pre-Calculation Summary

Formula Used

Mixed Liquor Suspended Solids = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume
X^' = θ_c*Q_w'*X_r/V
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.
Mean Cell Residence Time - (Measured in Second) - Mean Cell Residence Time is the average time that the sludge remains in the reactor.
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.
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.
Reactor Volume - (Measured in Cubic Meter) - The Reactor Volume gives us the capacity of the reactor.

STEP 1: Convert Input(s) to Base Unit

Mean Cell Residence Time: 14 Day --> 1209600 Second (Check conversion here)
WAS Pumping Rate from Return Line: 300 Cubic Meter per Day --> 0.00347222222222222 Cubic Meter per Second (Check conversion here)
Sludge Concentration in Return Line: 200 Milligram per Liter --> 0.2 Kilogram per Cubic Meter (Check conversion here)
Reactor Volume: 1000 Cubic Meter --> 1000 Cubic Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

X^' = θ_c*Q_w'*X_r/V --> 1209600*0.00347222222222222*0.2/1000

Evaluating ... ...

X^' = 0.84

STEP 3: Convert Result to Output's Unit

0.84 Kilogram per Cubic Meter -->840 Milligram per Liter (Check conversion here)

FINAL ANSWER

840 Milligram per Liter <-- Mixed Liquor Suspended Solids

(Calculation completed in 00.005 seconds)

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Home » Engineering » Civil » Environmental Engineering » Design of a Complete Mix Activated Sludge Reactor » MLSS and MLVSS » MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low

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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 using Wasting rate from Return Line when Concentration of Solid in Effluent is Low Formula

Mixed Liquor Suspended Solids = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume
X^' = θ_c*Q_w'*X_r/V

What is Wasting Rate?

The Wasting rate from return line is the time required to waste sludge from the return sludge line because return activated sludge is more concentrated and requires smaller waste sludge pumps.

How to Calculate MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low?

MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low calculator uses Mixed Liquor Suspended Solids = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume to calculate the Mixed Liquor Suspended Solids, The MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low is defined as a measure of the concentration of suspended solids in the mixed liquor of an aeration tank, typically part of an activated sludge process in wastewater treatment. MLSS is crucial because it indicates the amount of biomass (microorganisms) available to break down organic matter in the wastewater. Mixed Liquor Suspended Solids is denoted by X^' symbol.

How to calculate MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low using this online calculator? To use this online calculator for MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low, enter Mean Cell Residence Time (θ_c), WAS Pumping Rate from Return Line (Q_w'), Sludge Concentration in Return Line (X_r) & Reactor Volume (V) and hit the calculate button. Here is how the MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low calculation can be explained with given input values -> 840000 = 1209600*0.00347222222222222*0.2/1000.

FAQ

What is MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low?

The MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low is defined as a measure of the concentration of suspended solids in the mixed liquor of an aeration tank, typically part of an activated sludge process in wastewater treatment. MLSS is crucial because it indicates the amount of biomass (microorganisms) available to break down organic matter in the wastewater and is represented as X^' = θ_c*Q_w'*X_r/V or Mixed Liquor Suspended Solids = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume. Mean Cell Residence Time is the average time that the sludge remains in the reactor, WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line, Sludge Concentration in Return Line is the total BOD that is present in the return line & The Reactor Volume gives us the capacity of the reactor.

How to calculate MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low?

The MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low is defined as a measure of the concentration of suspended solids in the mixed liquor of an aeration tank, typically part of an activated sludge process in wastewater treatment. MLSS is crucial because it indicates the amount of biomass (microorganisms) available to break down organic matter in the wastewater is calculated using Mixed Liquor Suspended Solids = Mean Cell Residence Time*WAS Pumping Rate from Return Line*Sludge Concentration in Return Line/Reactor Volume. To calculate MLSS using Wasting rate from Return Line when Concentration of Solid in Effluent is Low, you need Mean Cell Residence Time (θ_c), WAS Pumping Rate from Return Line (Q_w'), Sludge Concentration in Return Line (X_r) & Reactor Volume (V). With our tool, you need to enter the respective value for Mean Cell Residence Time, WAS Pumping Rate from Return Line, Sludge Concentration in Return Line & Reactor Volume 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 Mean Cell Residence Time, WAS Pumping Rate from Return Line, Sludge Concentration in Return Line & Reactor Volume. 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 = Sludge Concentration in Return Line*(Return Activated Sludge+WAS Pumping Rate from Return Line)/(Average Daily Influent Flow Rate+Return Activated Sludge)

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