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Return Activated Sludge Flow Rate 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 = 1.25 \cdot Q

RAS - Return Activated Sludge?Q - Average Daily Influent Flow Rate?

Return Activated Sludge Flow Rate Example

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Here is how the Return Activated Sludge Flow Rate equation looks like with Values.

Here is how the Return Activated Sludge Flow Rate equation looks like with Units.

Here is how the Return Activated Sludge Flow Rate equation looks like.

10 = 1.25 \cdot 8

10m³/d = 1.25 \cdot 8m³/d

10 = 1.25 \cdot 8

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Return Activated Sludge Flow Rate Solution

Follow our step by step solution on how to calculate Return Activated Sludge Flow Rate?

FIRST Step Consider the formula

RAS = 1.25 \cdot Q

Next Step Substitute values of Variables

∴

RAS = 1.25 \cdot 8m³/d

Next Step Convert Units

∴

RAS = 1.25 \cdot 9.3E-5m³/s

Next Step Prepare to Evaluate

∴

RAS = 1.25 \cdot 9.3E-5

Next Step Evaluate

∴

RAS = 0.000115740740740741m³/s

LAST Step Convert to Output's Unit

∴

RAS = 10m³/d

Return Activated Sludge Flow Rate 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

Average Daily Influent Flow Rate

The Average Daily Influent Flow Rate is the total volume of wastewater entering a treatment facility per day, averaged over a specified period, typically measured in cubic meters per day (m³/day).

Symbol: Q

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 Circular Settling Tank category

Go Surface Area of Circular Settling Tank

SA = (\frac{Q p}{S l})

Go Peak Discharge given Surface Area of Circular Settling Tank

Q p = (SA \cdot S l)

Go Design Surface Loading Rate given Surface Area of Circular Settling Tank

S l = (\frac{Q p}{SA})

Go Peak Discharge in Circular Settling Tanks

Q p = Q d \cdot f

How to Evaluate Return Activated Sludge Flow Rate?

Return Activated Sludge Flow Rate evaluator uses Return Activated Sludge = 1.25*Average Daily Influent Flow Rate to evaluate the Return Activated Sludge, The Return Activated Sludge Flow Rate is defined as rate at which activated sludge from the secondary clarifier is returned to the biological treatment process, typically measured in cubic meters per day (m³/day). Return Activated Sludge is denoted by RAS symbol.

How to evaluate Return Activated Sludge Flow Rate using this online evaluator? To use this online evaluator for Return Activated Sludge Flow Rate, enter Average Daily Influent Flow Rate (Q) and hit the calculate button.

FAQs on Return Activated Sludge Flow Rate

What is the formula to find Return Activated Sludge Flow Rate?

The formula of Return Activated Sludge Flow Rate is expressed as Return Activated Sludge = 1.25*Average Daily Influent Flow Rate. Here is an example- 864000 = 1.25*9.25925925925926E-05.

How to calculate Return Activated Sludge Flow Rate?

With Average Daily Influent Flow Rate (Q) we can find Return Activated Sludge Flow Rate using the formula - Return Activated Sludge = 1.25*Average Daily Influent Flow Rate.

Can the Return Activated Sludge Flow Rate be negative?

No, the Return Activated Sludge Flow Rate, measured in Volumetric Flow Rate cannot be negative.

Which unit is used to measure Return Activated Sludge Flow Rate?

Return Activated Sludge Flow Rate 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 Return Activated Sludge Flow Rate can be measured.

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