Suraj Kumar
Birsa Institute of Technology (BIT), Sindri
Suraj Kumar has created this Calculator and 500+ more calculators!
Ishita Goyal
Meerut Institute of Engineering and Technology (MIET), Meerut
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11 Other formulas that you can solve using the same Inputs

Mixed liquor volatile suspended solids when the volume of the reactor is given
mlvss=(mean cell residence time*average daily influent flow rate*maximum yield coefficient*(influent substrate concentration-effluent substrate concentration))/(Volume of the reactor*(1+(endogenous decay coefficient*mean cell residence time))) GO
Influent substrate concentration when the volume of the reactor is given
influent substrate concentration=((Volume of the reactor*mlvss*(1+(endogenous decay coefficient*mean cell residence time)))/(mean cell residence time*average daily influent flow rate*maximum yield coefficient))+effluent substrate concentration GO
Effluent substrate concentration when the volume of the reactor is given
effluent substrate concentration=influent substrate concentration-((Volume of the reactor*mlvss*(1+(endogenous decay coefficient*mean cell residence time)))/(mean cell residence time*average daily influent flow rate*maximum yield coefficient)) GO
Volume of the Reactor
Volume of the reactor=(mean cell residence time*maximum yield coefficient*average daily influent flow rate*(influent substrate concentration-effluent substrate concentration))/(mlvss*(1+(mean cell residence time*endogenous decay coefficient))) GO
Mean cell residence time when the volume of the reactor is given
mean cell residence time=(Volume of the reactor*mlvss)/(average daily influent flow rate*maximum yield coefficient*(influent substrate concentration-effluent substrate concentration)-(Volume of the reactor*mlvss*endogenous decay coefficient)) GO
Maximum yield coefficient when the volume of the reactor is given
maximum yield coefficient=Volume of the reactor*mlvss*(1+(mean cell residence time*endogenous decay coefficient))/(mean cell residence time*average daily influent flow rate*(influent substrate concentration-effluent substrate concentration)) GO
Endogenous decay constant when the volume of the reactor is given
endogenous decay coefficient=((average daily influent flow rate*maximum yield coefficient*(influent substrate concentration-effluent substrate concentration))/(Volume of the reactor*mlvss))-(1/mean cell residence time) GO
Observed Cell Yield When Net Waste Activated Sludge is Given
observed cell yield=net waste activated sludge/(8.34*average daily influent flow rate*(influent substrate concentration-effluent substrate concentration)) GO
Net waste activated sludge
net waste activated sludge=observed cell yield*average daily influent flow rate*(influent substrate concentration-effluent substrate concentration)*8.34 GO
Volume of Reactor when Hydraulic Retention Time is Given
Volume of the reactor=hydraulic retention time*average daily influent flow rate GO
Hydraulic Retention Time
hydraulic retention time=Volume of the reactor/average daily influent flow rate GO

3 Other formulas that calculate the same Output

RAS Pumping Rate from Aeration Tank
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) GO
RAS Pumping Rate when Recirculation Ratio is Given
Return activated sludge=recirculation ratio*average daily influent flow rate GO
Return Activated Sludge Flow Rate when Maximum Solids Entering the Clarifier is Given
Return activated sludge=(Maximum solids/(mlss*8.34))-Peak Discharge GO

Return Activated Sludge Flow Rate Formula

Return activated sludge=1.25*average daily influent flow rate
Q<sub>r</sub>=1.25*Q
More formulas
Peak Discharge in Circular Settling Tanks GO
Average Daily Load when Peak Discharge in Circular Settling Tanks is Given GO
Peaking Factor when Peak Discharge in Circular Settling Tanks is Given GO
Surface Area of Circular Settling Tank GO
Peak Discharge when Surface Area of Circular Settling Tank is Given GO
Design Surface Loading Rate when Surface Area of Circular Settling Tank is Given GO
Influent Flow Rate when Return Activated Sludge Flow Rate is Given GO
Maximum Solids Entering the Clarifier GO
Peak Discharge when Maximum Solids Entering the Clarifier is Given GO
Return Activated Sludge Flow Rate when Maximum Solids Entering the Clarifier is Given GO
Mixed Liquor Suspended Solids in Aeration Tank when Maximum Solids is Given GO
Assumed Solid Loading Rate of Circular Settling Tanks GO
Maximum Solids when Solid Loading Rate is Given GO
Surface Area when Solid Loading Rate is Given GO
Actual Solid Loading Rate of Circular Settling Tanks GO
Solids Processed when Actual Solid Loading Rate is Given GO
Total Settling Tank Surface Area when Actual Solid Loading Rate is Given GO

What is return activated sludge flow rate ?

Returning activated sludge will vary with each installation and with different load factors. In general, it will range from 20 to 40 percent of the influent wastewater flow for diffused air and 10 to 40 percent for mechanical aeration units.

How to Calculate Return Activated Sludge Flow Rate?

Return Activated Sludge Flow Rate calculator uses Return activated sludge=1.25*average daily influent flow rate to calculate the Return activated sludge, The Return Activated Sludge Flow Rate will vary with each installation and with different load factors.It is calculated when we have prior knowledge of daily influent flow rate. Return activated sludge and is denoted by Qr symbol.

How to calculate Return Activated Sludge Flow Rate using this online calculator? To use this online calculator for Return Activated Sludge Flow Rate, enter average daily influent flow rate (Q) and hit the calculate button. Here is how the Return Activated Sludge Flow Rate calculation can be explained with given input values -> 1.447E-5 = 1.25*1.15740740740741E-05.

FAQ

What is Return Activated Sludge Flow Rate?
The Return Activated Sludge Flow Rate will vary with each installation and with different load factors.It is calculated when we have prior knowledge of daily influent flow rate and is represented as Qr=1.25*Q or Return activated sludge=1.25*average daily influent flow rate. Average daily influent flow rate is the total discharge that comes in the reactor.
How to calculate Return Activated Sludge Flow Rate?
The Return Activated Sludge Flow Rate will vary with each installation and with different load factors.It is calculated when we have prior knowledge of daily influent flow rate is calculated using Return activated sludge=1.25*average daily influent flow rate. To calculate Return Activated Sludge Flow Rate, you need average daily influent flow rate (Q). With our tool, you need to enter the respective value for average daily influent flow rate 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 average daily influent flow rate. We can use 3 other way(s) to calculate the same, which is/are as follows -
  • Return activated sludge=(Maximum solids/(mlss*8.34))-Peak Discharge
  • 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)
  • Return activated sludge=recirculation ratio*average daily influent flow rate
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