Secondary clarifiers help to separate the solids from the liquid phase of the
mixed liquor, and remove settled solids from the floor. The three secondary
clarifiers at the Glens Falls plant are of the circular, center-column, siphon
feed type. Each of these clarifiers are 90 feet in diameter with a water depth
of 12 feet. The clarifiers have a detention time of 4.5 hours and an overflow
rate of 479 gallons per day per square foot.
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