Sludge Recirculation Ratio Calculator

✖Recirculation flow is the flow generated in recirculation tank collecting the primary treated effluent from a pretreatment component.ⓘ Recirculation flow [Q_r]			+10% -10%
✖Sewage discharge is the flow rate of sewage when it is being discharged in the river.ⓘ Sewage Discharge [Q_s]			+10% -10%

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

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Formula

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Sludge Recirculation Ratio

Formula

`"α" = "Q"_{"r"}/"Q"_{"s"}`

Example

`"1.4E^-5"="12m³/d"/"10m³/s"`

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Sludge Recirculation Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Recirculation Ratio = Recirculation flow/Sewage Discharge
α = Q_r/Q_s
This formula uses 3 Variables

Variables Used

Recirculation Ratio - Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.
Recirculation flow - (Measured in Cubic Meter per Second) - Recirculation flow is the flow generated in recirculation tank collecting the primary treated effluent from a pretreatment component.
Sewage Discharge - (Measured in Cubic Meter per Second) - Sewage discharge is the flow rate of sewage when it is being discharged in the river.

STEP 1: Convert Input(s) to Base Unit

Recirculation flow: 12 Cubic Meter per Day --> 0.000138888888888889 Cubic Meter per Second (Check conversion here)
Sewage Discharge: 10 Cubic Meter per Second --> 10 Cubic Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

α = Q_r/Q_s --> 0.000138888888888889/10

Evaluating ... ...

α = 1.38888888888889E-05

STEP 3: Convert Result to Output's Unit

1.38888888888889E-05 --> No Conversion Required

FINAL ANSWER

1.38888888888889E-05 ≈ 1.4E-5 <-- Recirculation Ratio

(Calculation completed in 00.004 seconds)

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Created by Suraj Kumar

Birsa Institute of Technology (BIT), Sindri

Suraj Kumar has created this Calculator and 2200+ more calculators!

Verified by Ishita Goyal

Meerut Institute of Engineering and Technology (MIET), Meerut

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< 4 Sludge Recirculation Ratio Calculators

Sludge Recirculation Rate given MLSS and SVI

Go Recirculation flow = Sewage Discharge*(MLSS/(((10^6)/Sludge Volume Index)-MLSS))

Sludge Recirculation Ratio given Sludge Volume Index

Go Recirculation Ratio = (MLSS/(((10^6)/Sludge Volume Index)-MLSS))

Sludge Recirculation Rate given Sludge Recirculation Ratio

Go Recirculation flow = Recirculation Ratio*Sewage Concentration

Sludge Recirculation Ratio

Go Recirculation Ratio = Recirculation flow/Sewage Discharge

Sludge Recirculation Ratio Formula

Recirculation Ratio = Recirculation flow/Sewage Discharge
α = Q_r/Q_s

What is sludge recirculation ratio ?

The sludge recirculation ratio is generally in the range of 0.25 to 0.5. recommendation are mean cell residence time of 5 to 15 days, MLSS of 1500 to 3000 mg/L, HRT of 4 to 8 h and sludge recirculation ratio of 0.25 to 0.5.

How to Calculate Sludge Recirculation Ratio?

Sludge Recirculation Ratio calculator uses Recirculation Ratio = Recirculation flow/Sewage Discharge to calculate the Recirculation Ratio, The Sludge Recirculation Ratio is the ratio of return sludge to sewage flow.It is also called return sludge ratio. Recirculation Ratio is denoted by α symbol.

How to calculate Sludge Recirculation Ratio using this online calculator? To use this online calculator for Sludge Recirculation Ratio, enter Recirculation flow (Q_r) & Sewage Discharge (Q_s) and hit the calculate button. Here is how the Sludge Recirculation Ratio calculation can be explained with given input values -> 1.4E-5 = 0.000138888888888889/10.

FAQ

What is Sludge Recirculation Ratio?

The Sludge Recirculation Ratio is the ratio of return sludge to sewage flow.It is also called return sludge ratio and is represented as α = Q_r/Q_s or Recirculation Ratio = Recirculation flow/Sewage Discharge. Recirculation flow is the flow generated in recirculation tank collecting the primary treated effluent from a pretreatment component & Sewage discharge is the flow rate of sewage when it is being discharged in the river.

How to calculate Sludge Recirculation Ratio?

The Sludge Recirculation Ratio is the ratio of return sludge to sewage flow.It is also called return sludge ratio is calculated using Recirculation Ratio = Recirculation flow/Sewage Discharge. To calculate Sludge Recirculation Ratio, you need Recirculation flow (Q_r) & Sewage Discharge (Q_s). With our tool, you need to enter the respective value for Recirculation flow & Sewage Discharge 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 Recirculation Ratio?

In this formula, Recirculation Ratio uses Recirculation flow & Sewage Discharge. We can use 1 other way(s) to calculate the same, which is/are as follows -

Recirculation Ratio = (MLSS/(((10^6)/Sludge Volume Index)-MLSS))

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