RAS Pumping Rate using Recirculation Ratio Calculator

✖Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.ⓘ Recirculation Ratio [α]			+10% -10%
✖Average daily influent flow rate is the total discharge that comes in the reactor.ⓘ Average daily influent flow rate [Q]			+10% -10%

✖Return activated sludge flow rate will vary with each installation and with different load factors.ⓘ RAS Pumping Rate using Recirculation Ratio [Q_r]

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Formula

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RAS Pumping Rate using Recirculation Ratio

Formula

`"Q"_{"r"} = "α"*"Q"`

Example

`"1.8m³/d"="1.5"*"1.2m³/d"`

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RAS Pumping Rate using Recirculation Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Return Activated Sludge = Recirculation Ratio*Average daily influent flow rate
Q_r = α*Q
This formula uses 3 Variables

Variables Used

Return Activated Sludge - (Measured in Cubic Meter per Second) - Return activated sludge flow rate will vary with each installation and with different load factors.
Recirculation Ratio - Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.
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

Recirculation Ratio: 1.5 --> No Conversion Required
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

Q_r = α*Q --> 1.5*1.38888888888889E-05

Evaluating ... ...

Q_r = 2.08333333333333E-05

STEP 3: Convert Result to Output's Unit

2.08333333333333E-05 Cubic Meter per Second -->1.8 Cubic Meter per Day (Check conversion here)

FINAL ANSWER

1.8 Cubic Meter per Day <-- Return Activated Sludge

(Calculation completed in 00.004 seconds)

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Meerut Institute of Engineering and Technology (MIET), Meerut

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< 2 RAS Pumping Rate Calculators

RAS Pumping Rate from Aeration Tank

Go Return Activated Sludge = (MLSS*Average daily influent flow rate-Sludge Concentration in Return Line*WAS Pumping Rate from Return Line)/(Sludge Concentration in Return Line-MLSS)

RAS Pumping Rate using Recirculation Ratio

Go Return Activated Sludge = Recirculation Ratio*Average daily influent flow rate

RAS Pumping Rate using Recirculation Ratio Formula

Return Activated Sludge = Recirculation Ratio*Average daily influent flow rate
Q_r = α*Q

What is recirculation ratio?

The Recirculation ratio is the ratio of RAS pumping rate to influent flow rate. The recirculation ratio can vary from 0.25 to 1.50 depending upon the type of activated sludge process used.

How to Calculate RAS Pumping Rate using Recirculation Ratio?

RAS Pumping Rate using Recirculation Ratio calculator uses Return Activated Sludge = Recirculation Ratio*Average daily influent flow rate to calculate the Return Activated Sludge, The RAS pumping rate using recirculation ratio is the total amount of returned activated sludge that is generated after the decomposition takes place. Return Activated Sludge is denoted by Q_r symbol.

How to calculate RAS Pumping Rate using Recirculation Ratio using this online calculator? To use this online calculator for RAS Pumping Rate using Recirculation Ratio, enter Recirculation Ratio (α) & Average daily influent flow rate (Q) and hit the calculate button. Here is how the RAS Pumping Rate using Recirculation Ratio calculation can be explained with given input values -> 383616 = 1.5*1.38888888888889E-05.

FAQ

What is RAS Pumping Rate using Recirculation Ratio?

The RAS pumping rate using recirculation ratio is the total amount of returned activated sludge that is generated after the decomposition takes place and is represented as Q_r = α*Q or Return Activated Sludge = Recirculation Ratio*Average daily influent flow rate. Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate & Average daily influent flow rate is the total discharge that comes in the reactor.

How to calculate RAS Pumping Rate using Recirculation Ratio?

The RAS pumping rate using recirculation ratio is the total amount of returned activated sludge that is generated after the decomposition takes place is calculated using Return Activated Sludge = Recirculation Ratio*Average daily influent flow rate. To calculate RAS Pumping Rate using Recirculation Ratio, you need Recirculation Ratio (α) & Average daily influent flow rate (Q). With our tool, you need to enter the respective value for Recirculation Ratio & 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 Return Activated Sludge?

In this formula, Return Activated Sludge uses Recirculation Ratio & Average daily influent flow rate. We can use 1 other way(s) to calculate the same, which is/are as follows -

Return Activated Sludge = (MLSS*Average daily influent flow rate-Sludge Concentration in Return Line*WAS Pumping Rate from Return Line)/(Sludge Concentration in Return Line-MLSS)

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