Recirculation Ratio Calculator

✖Return Activated Sludge is the portion of settled biomass that is recycled from the secondary clarifier back to the aeration tank in a wastewater treatment process.ⓘ Return Activated Sludge [RAS]			+10% -10%
✖Average Daily Influent Flow Rate is the total discharge that comes in the reactor.ⓘ Average Daily Influent Flow Rate [Q_a]			+10% -10%

✖Recirculation Ratio refers to the ratio of the RAS pumping rate to influent flow rate.ⓘ Recirculation Ratio [α]

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Recirculation Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Recirculation Ratio = Return Activated Sludge/Average Daily Influent Flow Rate
α = RAS/Q_a
This formula uses 3 Variables

Variables Used

Recirculation Ratio - Recirculation Ratio refers to the ratio of the RAS pumping rate to influent flow rate.
Return Activated Sludge - (Measured in Cubic Meter per Second) - Return Activated Sludge is the portion of settled biomass that is recycled from the secondary clarifier back to the aeration tank in a wastewater treatment process.
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 = RAS/Q_a --> 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)

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Created by Ishita Goyal

Meerut Institute of Engineering and Technology (MIET), Meerut

Ishita Goyal has created this Calculator and 500+ more calculators!

Verified by Chandana P Dev

NSS College of Engineering (NSSCE), Palakkad

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< Design of a Complete Mix Activated Sludge Reactor Calculators

Sludge Concentration using Wasting Rate from Return Line when Solid Concentration in Effluent is Low

LaTeX Go Sludge Concentration in Return Line = Reactor Volume*MLSS/(Mean Cell Residence Time d*WAS Pumping Rate from Return Line)

Recirculation Ratio

LaTeX Go Recirculation Ratio = Return Activated Sludge/Average Daily Influent Flow Rate

Recirculation Ratio Formula

LaTeX Go

Recirculation Ratio = Return Activated Sludge/Average Daily Influent Flow Rate
α = RAS/Q_a

What is Recirculation Ratio?

Recirculation Ratio represents the proportion of the return activated sludge (RAS) flow rate to the influent flow rate. This ratio helps in maintaining the desired biomass concentration in the aeration tank, ensuring efficient treatment of the incoming wastewater.

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 formula is defined as 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 (RAS) & Average Daily Influent Flow Rate (Q_a) 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 formula is defined as 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 = RAS/Q_a or Recirculation Ratio = Return Activated Sludge/Average Daily Influent Flow Rate. Return Activated Sludge is the portion of settled biomass that is recycled from the secondary clarifier back to the aeration tank in a wastewater treatment process & Average Daily Influent Flow Rate is the total discharge that comes in the reactor.

How to calculate Recirculation Ratio?

The Recirculation Ratio formula is defined as 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 (RAS) & Average Daily Influent Flow Rate (Q_a). 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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