✖Sludge Volume Index is the volume occupied by 1 gram of activated sludge after 30 minutes of settling in a 1-liter graduated cylinder. SVI is expressed in milliliters per gram.ⓘ Sludge Volume Index [SVI]			+10% -10%
✖Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.ⓘ Recirculation Ratio [α]			+10% -10%

✖MLSS is the concentration of suspended solids in the mixed liquor within an aeration tank during the activated sludge process.ⓘ MLSS given Sludge Volume Index and Recirculation Ratio [X]

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Formula

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MLSS given Sludge Volume Index and Recirculation Ratio

Formula

`"X" = 1/("SVI"*(1+"α"))`

Example

`"2.666667mg/L"=1/("150mL/g"*(1+"1.5"))`

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MLSS given Sludge Volume Index and Recirculation Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

MLSS = 1/(Sludge Volume Index*(1+Recirculation Ratio))
X = 1/(SVI*(1+α))
This formula uses 3 Variables

Variables Used

MLSS - (Measured in Milligram per Liter) - MLSS is the concentration of suspended solids in the mixed liquor within an aeration tank during the activated sludge process.
Sludge Volume Index - (Measured in Cubic Meter per Kilogram) - Sludge Volume Index is the volume occupied by 1 gram of activated sludge after 30 minutes of settling in a 1-liter graduated cylinder. SVI is expressed in milliliters per gram.
Recirculation Ratio - Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.

STEP 1: Convert Input(s) to Base Unit

Sludge Volume Index: 150 Milliliter per Gram --> 0.15 Cubic Meter per Kilogram (Check conversion here)
Recirculation Ratio: 1.5 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

X = 1/(SVI*(1+α)) --> 1/(0.15*(1+1.5))

Evaluating ... ...

X = 2.66666666666667

STEP 3: Convert Result to Output's Unit

0.00266666666666667 Kilogram per Cubic Meter -->2.66666666666667 Milligram per Liter (Check conversion here)

FINAL ANSWER

2.66666666666667 ≈ 2.666667 Milligram per Liter <-- MLSS

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Environmental Engineering » Treatment of Sewage » Sludge Recycle and Rate of Returned Sludge » Mixed Liquor Suspended Solid MLSS » MLSS given Sludge Volume Index and Recirculation Ratio

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Birsa Institute of Technology (BIT), Sindri

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< 3 Mixed Liquor Suspended Solid MLSS Calculators

MLSS given SVI and Sewage Discharge

Go Mixed Liquor Suspended Solids = (((Recirculation Flow/Sewage Discharge)*(10^6))/Sludge Volume Index)/(1+(Recirculation Flow/Sewage Discharge))

MLSS given Sludge Recirculation Ratio

Go MLSS = (Recirculation Ratio*MLSS in returned or wasted sludge)/(1+Recirculation Ratio)

MLSS given Sludge Volume Index and Recirculation Ratio

Go MLSS = 1/(Sludge Volume Index*(1+Recirculation Ratio))

MLSS given Sludge Volume Index and Recirculation Ratio Formula

MLSS = 1/(Sludge Volume Index*(1+Recirculation Ratio))
X = 1/(SVI*(1+α))

What is mlss ?

Mixed liquor suspended solids (MLSS) is the concentration of suspended solids, in an aeration tank during the activated sludge process, which occurs during the treatment of waste water.

How to Calculate MLSS given Sludge Volume Index and Recirculation Ratio?

MLSS given Sludge Volume Index and Recirculation Ratio calculator uses MLSS = 1/(Sludge Volume Index*(1+Recirculation Ratio)) to calculate the MLSS, MLSS given Sludge Volume Index and Recirculation Ratio calculates mixed liquor suspended solids when we have prior information of other parameters used. MLSS is denoted by X symbol.

How to calculate MLSS given Sludge Volume Index and Recirculation Ratio using this online calculator? To use this online calculator for MLSS given Sludge Volume Index and Recirculation Ratio, enter Sludge Volume Index (SVI) & Recirculation Ratio (α) and hit the calculate button. Here is how the MLSS given Sludge Volume Index and Recirculation Ratio calculation can be explained with given input values -> 2666.667 = 1/(0.15*(1+1.5)).

FAQ

What is MLSS given Sludge Volume Index and Recirculation Ratio?

MLSS given Sludge Volume Index and Recirculation Ratio calculates mixed liquor suspended solids when we have prior information of other parameters used and is represented as X = 1/(SVI*(1+α)) or MLSS = 1/(Sludge Volume Index*(1+Recirculation Ratio)). Sludge Volume Index is the volume occupied by 1 gram of activated sludge after 30 minutes of settling in a 1-liter graduated cylinder. SVI is expressed in milliliters per gram & Recirculation Ratio is the ratio of the RAS pumping rate to influent flow rate.

How to calculate MLSS given Sludge Volume Index and Recirculation Ratio?

MLSS given Sludge Volume Index and Recirculation Ratio calculates mixed liquor suspended solids when we have prior information of other parameters used is calculated using MLSS = 1/(Sludge Volume Index*(1+Recirculation Ratio)). To calculate MLSS given Sludge Volume Index and Recirculation Ratio, you need Sludge Volume Index (SVI) & Recirculation Ratio (α). With our tool, you need to enter the respective value for Sludge Volume Index & Recirculation Ratio 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 MLSS?

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

MLSS = (Recirculation Ratio*MLSS in returned or wasted sludge)/(1+Recirculation Ratio)

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