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RAS Pumping Rate using Recirculation Ratio Formula

GoRAS Pumping Rate from Aeration Tank Formula

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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. Check FAQs

RAS = α \cdot Q a

RAS - Return Activated Sludge?α - Recirculation Ratio?Q_a - Average Daily Influent Flow Rate?

RAS Pumping Rate using Recirculation Ratio Example

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Here is how the RAS Pumping Rate using Recirculation Ratio equation looks like with Values.

Here is how the RAS Pumping Rate using Recirculation Ratio equation looks like with Units.

Here is how the RAS Pumping Rate using Recirculation Ratio equation looks like.

9.96 = 8.3 \cdot 1.2

9.96m³/d = 8.3 \cdot 1.2m³/d

9.96 = 8.3 \cdot 1.2

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RAS Pumping Rate using Recirculation Ratio Solution

Follow our step by step solution on how to calculate RAS Pumping Rate using Recirculation Ratio?

FIRST Step Consider the formula

RAS = α \cdot Q a

Next Step Substitute values of Variables

∴

RAS = 8.3 \cdot 1.2m³/d

Next Step Convert Units

∴

RAS = 8.3 \cdot 1.4E-5m³/s

Next Step Prepare to Evaluate

∴

RAS = 8.3 \cdot 1.4E-5

Next Step Evaluate

∴

RAS = 0.000115277777777778m³/s

Next Step Convert to Output's Unit

∴

RAS = 9.96000000000001m³/d

LAST Step Rounding Answer

∴

RAS = 9.96m³/d

RAS Pumping Rate using Recirculation Ratio Formula Elements

Variables

Return Activated Sludge

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.

Symbol: RAS

Measurement: Volumetric Flow RateUnit: m³/d

Note: Value should be greater than 0.

Formulas to find Return Activated Sludge

Recirculation Ratio

Recirculation Ratio refers to the ratio of the RAS pumping rate to influent flow rate.

Symbol: α

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Recirculation Ratio

Average Daily Influent Flow Rate

Average Daily Influent Flow Rate is the total discharge that comes in the reactor.

Symbol: Q_a

Measurement: Volumetric Flow RateUnit: m³/d

Note: Value should be greater than 0.

Formulas to find Average Daily Influent Flow Rate

Other Formulas to find Return Activated Sludge

Go RAS Pumping Rate from Aeration Tank

RAS = \frac{X \cdot Q a - X r \cdot Q w'}{X r - X}

How to Evaluate RAS Pumping Rate using Recirculation Ratio?

RAS Pumping Rate using Recirculation Ratio evaluator uses Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate to evaluate 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 evaluate RAS Pumping Rate using Recirculation Ratio using this online evaluator? To use this online evaluator for RAS Pumping Rate using Recirculation Ratio, enter Recirculation Ratio (α) & Average Daily Influent Flow Rate (Q_a) and hit the calculate button.

FAQs on RAS Pumping Rate using Recirculation Ratio

What is the formula to find RAS Pumping Rate using Recirculation Ratio?

The formula of RAS Pumping Rate using Recirculation Ratio is expressed as Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate. Here is an example- 155520 = 8.3*1.38888888888889E-05.

How to calculate RAS Pumping Rate using Recirculation Ratio?

With Recirculation Ratio (α) & Average Daily Influent Flow Rate (Q_a) we can find RAS Pumping Rate using Recirculation Ratio using the formula - Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate.

What are the other ways to Calculate Return Activated Sludge?

Here are the different ways to Calculate Return Activated Sludge-

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)

Can the RAS Pumping Rate using Recirculation Ratio be negative?

No, the RAS Pumping Rate using Recirculation Ratio, measured in Volumetric Flow Rate cannot be negative.

Which unit is used to measure RAS Pumping Rate using Recirculation Ratio?

RAS Pumping Rate using Recirculation Ratio is usually measured using the Cubic Meter per Day[m³/d] for Volumetric Flow Rate. Cubic Meter per Second[m³/d], Cubic Meter per Hour[m³/d], Cubic Meter per Minute[m³/d] are the few other units in which RAS Pumping Rate using Recirculation Ratio can be measured.

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RAS Pumping Rate using Recirculation Ratio Formula

​GoRAS Pumping Rate from Aeration Tank Formula

RAS Pumping Rate using Recirculation Ratio Example

RAS Pumping Rate using Recirculation Ratio Solution

RAS Pumping Rate using Recirculation Ratio Formula Elements

Other Formulas to find Return Activated Sludge

How to Evaluate RAS Pumping Rate using Recirculation Ratio?

FAQs on RAS Pumping Rate using Recirculation Ratio

Variable Name

GoRAS Pumping Rate from Aeration Tank Formula