Return Activated Sludge in Substrate Concentration 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.

Substrate Concentration formulas that make use of Return Activated Sludge

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

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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