Recirculation Ratio Solution

STEP 0: Pre-Calculation Summary
Formula Used
Recirculation Ratio = Return Activated Sludge/Average daily influent flow rate
α = Qr/Q
This formula uses 3 Variables
Variables Used
Recirculation Ratio - Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.
Return Activated Sludge - (Measured in Cubic Meter per Second) - Return activated sludge flow rate will vary with each installation and with different load factors.
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
Return Activated Sludge: 10 Cubic Meter per Day --> 0.000115740740740741 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
α = Qr/Q --> 0.000115740740740741/1.38888888888889E-05
Evaluating ... ...
α = 8.33333333333335
STEP 3: Convert Result to Output's Unit
8.33333333333335 --> No Conversion Required
FINAL ANSWER
8.33333333333335 8.333333 <-- Recirculation Ratio
(Calculation completed in 00.004 seconds)

Credits

Created by Ishita Goyal
Meerut Institute of Engineering and Technology (MIET), Meerut
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Verified by Chandana P Dev
NSS College of Engineering (NSSCE), Palakkad
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2 Design of a complete mix activated sludge reactor Calculators

Sludge Concentration using Wasting Rate from Return Line when Solid Concentration in Effluent is Low
Go Sludge Concentration in Return Line = Reactor Volume*MLSS/(Mean Cell Residence Time*WAS Pumping Rate from Return Line)
Recirculation Ratio
Go Recirculation Ratio = Return Activated Sludge/Average daily influent flow rate

Recirculation Ratio Formula

Recirculation Ratio = Return Activated Sludge/Average daily influent flow rate
α = Qr/Q

What is the use of recirculation ratio?

Common design practice is to size the RAS pumps so that they are capable of providing a recirculation ratio ranging from 0.50 to 1.50.

How to Calculate Recirculation Ratio?

Recirculation Ratio calculator uses Recirculation Ratio = Return Activated Sludge/Average daily influent flow rate to calculate the 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. Recirculation Ratio is denoted by α symbol.

How to calculate Recirculation Ratio using this online calculator? To use this online calculator for Recirculation Ratio, enter Return Activated Sludge (Qr) & Average daily influent flow rate (Q) and hit the calculate button. Here is how the Recirculation Ratio calculation can be explained with given input values -> 8.333333 = 0.000115740740740741/1.38888888888889E-05.

FAQ

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 and is represented as α = Qr/Q or Recirculation Ratio = Return Activated Sludge/Average daily influent flow rate. Return activated sludge flow rate will vary with each installation and with different load factors & Average daily influent flow rate is the total discharge that comes in the reactor.
How to calculate 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 is calculated using Recirculation Ratio = Return Activated Sludge/Average daily influent flow rate. To calculate Recirculation Ratio, you need Return Activated Sludge (Qr) & Average daily influent flow rate (Q). With our tool, you need to enter the respective value for Return Activated Sludge & 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.
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