Return Activated Sludge in Environmental Engineering Formulas

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. And is denoted by RAS. Return Activated Sludge is usually measured using the Cubic Meter per Day for Volumetric Flow Rate. Note that the value of Return Activated Sludge is always positive.

Formulas to find Return Activated Sludge in Environmental Engineering

fxRAS Pumping Rate from Aeration TankGo

fxRAS Pumping Rate using Recirculation RatioGo

Environmental Engineering formulas that make use of Return Activated Sludge

fxRecirculation RatioGo

fxConcentration of Sludge in Return Line given RAS Pumping Rate from Aeration TankGo

fxAverage Daily Influent Flow Rate using Recirculation RatioGo

fxWAS Pumping Rate from Return Line given RAS Pumping Rate from Aeration TankGo

List of variables in Environmental Engineering formulas

fx MLSS Go

fx Average Daily Influent Flow Rate Go

fx Sludge Concentration in Return Line Go

fx WAS Pumping Rate from Return Line Go

fx Recirculation Ratio Go

FAQ

What is the 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. Return Activated Sludge is usually measured using the Cubic Meter per Day for Volumetric Flow Rate. Note that the value of Return Activated Sludge is always positive.

Can the Return Activated Sludge be negative?

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

What unit is used to measure Return Activated Sludge?

Return Activated Sludge 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 can be measured.

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