RAS Pumping Rate using Recirculation Ratio Solution

STEP 0: Pre-Calculation Summary
Formula Used
Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate
RAS = α*Qa
This formula uses 3 Variables
Variables Used
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.
Recirculation Ratio - Recirculation Ratio refers to 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: 8.3 --> 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
RAS = α*Qa --> 8.3*1.38888888888889E-05
Evaluating ... ...
RAS = 0.000115277777777778
STEP 3: Convert Result to Output's Unit
0.000115277777777778 Cubic Meter per Second -->9.96000000000001 Cubic Meter per Day (Check conversion ​here)
FINAL ANSWER
9.96000000000001 9.96 Cubic Meter per Day <-- Return Activated Sludge
(Calculation completed in 00.004 seconds)

Credits

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Created by Ishita Goyal
Meerut Institute of Engineering and Technology (MIET), Meerut
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RAS Pumping Rate Calculators

RAS Pumping Rate from Aeration Tank
​ LaTeX ​ 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
​ LaTeX ​ Go Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate

RAS Pumping Rate using Recirculation Ratio Formula

​LaTeX ​Go
Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate
RAS = α*Qa

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 RAS 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 (Qa) and hit the calculate button. Here is how the RAS Pumping Rate using Recirculation Ratio calculation can be explained with given input values -> 155520 = 8.3*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 RAS = α*Qa or Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate. Recirculation Ratio refers to 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 (Qa). 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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