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Secondary Treatment – Clarifiers
The second stage of secondary treatment involves the settling of activated sludge by gravity in the final settling tanks, or secondary clarifiers. A portion of this settled activated sludge is returned to the aeration tanks (returned activated sludge, or RAS) to maintain biological equilibrium in the aeration tank, while the remaining portion is discharged/ wasted (waste activated sludge, or WAS) to the sewer. All of the waste activated sludge flows to the Hyperion Treatment Plant for further processing.