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Recirculation Ratio Formula

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

α = \frac{RAS}{Q a}

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

Recirculation Ratio Example

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Here is how the Recirculation Ratio equation looks like with Values.

Here is how the Recirculation Ratio equation looks like with Units.

Here is how the Recirculation Ratio equation looks like.

8.3333 = \frac{10}{1.2}

8.3333 = \frac{10m³/d}{1.2m³/d}

8.3333 = \frac{10}{1.2}

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Recirculation Ratio Solution

Follow our step by step solution on how to calculate Recirculation Ratio?

FIRST Step Consider the formula

α = \frac{RAS}{Q a}

Next Step Substitute values of Variables

∴

α = \frac{10m³/d}{1.2m³/d}

Next Step Convert Units

∴

α = \frac{0.0001m³/s}{1.4E-5m³/s}

Next Step Prepare to Evaluate

∴

α = \frac{0.0001}{1.4E-5}

Next Step Evaluate

∴

α = 8.33333333333335

LAST Step Rounding Answer

∴

α = 8.3333

Recirculation Ratio Formula Elements

Variables

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

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

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 in Design of a Complete Mix Activated Sludge Reactor category

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

X r = V \cdot \frac{X}{θ m \cdot Q w'}

How to Evaluate Recirculation Ratio?

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

FAQs on Recirculation Ratio

What is the formula to find Recirculation Ratio?

The formula of Recirculation Ratio is expressed as Recirculation Ratio = Return Activated Sludge/Average Daily Influent Flow Rate. Here is an example- 8.333333 = 0.000115740740740741/1.38888888888889E-05.

How to calculate Recirculation Ratio?

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

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Recirculation Ratio Formula

Recirculation Ratio Example

Recirculation Ratio Solution

Recirculation Ratio Formula Elements

Other formulas in Design of a Complete Mix Activated Sludge Reactor category

How to Evaluate Recirculation Ratio?

FAQs on Recirculation Ratio

Variable Name