RAS Pumping Rate from Aeration Tank Calculator

✖MLSS is the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics).ⓘ MLSS [X]			+10% -10%
✖Average Daily Influent Flow Rate is the total discharge that comes in the reactor.ⓘ Average Daily Influent Flow Rate [Q_a]			+10% -10%
✖Sludge Concentration in Return Line refers to the concentration of suspended solids in the sludge that is being pumped back from the secondary clarifier to the aeration tank.ⓘ Sludge Concentration in Return Line [X_r]			+10% -10%
✖WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line.ⓘ WAS Pumping Rate from Return Line [Q_w']			+10% -10%

✖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.ⓘ RAS Pumping Rate from Aeration Tank [RAS]

⎘ Copy

👎

Formula

LaTeX

Reset

👍

Download Pumping Rate Formulas PDF PDF Image

RAS Pumping Rate from Aeration Tank Solution

STEP 0: Pre-Calculation Summary

Formula Used

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)
RAS = (X*Q_a-X_r*Q_w')/(X_r-X)
This formula uses 5 Variables

Variables Used

Return Activated Sludge - (Measured in Cubic Meter per Second) - 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.
MLSS - (Measured in Kilogram per Cubic Meter) - MLSS is the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics).
Average Daily Influent Flow Rate - (Measured in Cubic Meter per Second) - Average Daily Influent Flow Rate is the total discharge that comes in the reactor.
Sludge Concentration in Return Line - (Measured in Kilogram per Cubic Meter) - Sludge Concentration in Return Line refers to the concentration of suspended solids in the sludge that is being pumped back from the secondary clarifier to the aeration tank.
WAS Pumping Rate from Return Line - (Measured in Cubic Meter per Second) - WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line.

STEP 1: Convert Input(s) to Base Unit

MLSS: 1200 Milligram per Liter --> 1.2 Kilogram per Cubic Meter (Check conversion here)
Average Daily Influent Flow Rate: 1.2 Cubic Meter per Day --> 1.38888888888889E-05 Cubic Meter per Second (Check conversion here)
Sludge Concentration in Return Line: 200 Milligram per Liter --> 0.2 Kilogram per Cubic Meter (Check conversion here)
WAS Pumping Rate from Return Line: 400 Cubic Meter per Day --> 0.00462962962962963 Cubic Meter per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

RAS = (X*Q_a-X_r*Q_w')/(X_r-X) --> (1.2*1.38888888888889E-05-0.2*0.00462962962962963)/(0.2-1.2)

Evaluating ... ...

RAS = 0.000909259259259259

STEP 3: Convert Result to Output's Unit

0.000909259259259259 Cubic Meter per Second -->78.56 Cubic Meter per Day (Check conversion here)

FINAL ANSWER

78.56 Cubic Meter per Day <-- Return Activated Sludge

(Calculation completed in 00.004 seconds)

You are here -

Home » Engineering » Civil » Environmental Engineering » Design of a Complete Mix Activated Sludge Reactor » Pumping Rate » RAS Pumping Rate » RAS Pumping Rate from Aeration Tank

Credits

Created by Ishita Goyal

Meerut Institute of Engineering and Technology (MIET), Meerut

Ishita Goyal has created this Calculator and 500+ more calculators!

Verified by Chandana P Dev

NSS College of Engineering (NSSCE), Palakkad

Chandana P Dev has verified this Calculator and 1700+ more calculators!

< RAS Pumping Rate Calculators

RAS Pumping Rate from Aeration Tank

LaTeX Go 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)

RAS Pumping Rate using Recirculation Ratio

LaTeX Go Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate

RAS Pumping Rate from Aeration Tank Formula

LaTeX Go

What is Aeration Tank?

An Aeration Tank is a critical component in wastewater treatment plants, particularly in the activated sludge process. It is a large, often rectangular or circular, tank where wastewater is mixed with air (or oxygen) to support the growth of aerobic microorganisms. These microorganisms break down organic matter in the wastewater through biological processes.

How to Calculate RAS Pumping Rate from Aeration Tank?

RAS Pumping Rate from Aeration Tank calculator uses 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) to calculate the Return Activated Sludge, The RAS pumping rate from aeration tank is the amount of returned activated sludge that is generated from the aeration tank. Return Activated Sludge is denoted by RAS symbol.

How to calculate RAS Pumping Rate from Aeration Tank using this online calculator? To use this online calculator for RAS Pumping Rate from Aeration Tank, enter MLSS (X), Average Daily Influent Flow Rate (Q_a), Sludge Concentration in Return Line (X_r) & WAS Pumping Rate from Return Line (Q_w') and hit the calculate button. Here is how the RAS Pumping Rate from Aeration Tank calculation can be explained with given input values -> 6.8E+6 = (1.2*1.38888888888889E-05-0.2*0.00462962962962963)/(0.2-1.2).

FAQ

What is RAS Pumping Rate from Aeration Tank?

The RAS pumping rate from aeration tank is the amount of returned activated sludge that is generated from the aeration tank and is represented as RAS = (X*Q_a-X_r*Q_w')/(X_r-X) or 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). MLSS is the sum of volatile suspended solids (organics) and fixed suspended solids (inorganics), Average Daily Influent Flow Rate is the total discharge that comes in the reactor, Sludge Concentration in Return Line refers to the concentration of suspended solids in the sludge that is being pumped back from the secondary clarifier to the aeration tank & WAS Pumping Rate from Return Line is the flow rate of waste sludge from the return line.

How to calculate RAS Pumping Rate from Aeration Tank?

The RAS pumping rate from aeration tank is the amount of returned activated sludge that is generated from the aeration tank is calculated using 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). To calculate RAS Pumping Rate from Aeration Tank, you need MLSS (X), Average Daily Influent Flow Rate (Q_a), Sludge Concentration in Return Line (X_r) & WAS Pumping Rate from Return Line (Q_w'). With our tool, you need to enter the respective value for MLSS, Average Daily Influent Flow Rate, Sludge Concentration in Return Line & WAS Pumping Rate from Return Line 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 Return Activated Sludge?

In this formula, Return Activated Sludge uses MLSS, Average Daily Influent Flow Rate, Sludge Concentration in Return Line & WAS Pumping Rate from Return Line. We can use 1 other way(s) to calculate the same, which is/are as follows -

Return Activated Sludge = Recirculation Ratio*Average Daily Influent Flow Rate

Home

FREE PDFs

🔍 Search