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SCHEMATIC WATER FL®W
E.I. DU PONT DE NEMOURS & CO.
FAYETTEVILLE WORKS
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PONT DE NEMOURS & CO.
FAYETTEVILLE WORKS
PAGE 2 OF 2

DUPONT - -FAY ETTEVILLE WORKS
NCD00035 /a
Sludge Management Plan
The DuPont -Fayetteville Works operates a Class 3 Wastewater Treatment Plant which is
comprised of a single -stage activated sludge biological system.
Excess sludge is removed from the system by diverting part of the Recycled Activated Sludge
at approximately 0.6% solids) from the clarifiers to a Dissolved Air Floatation (DAF) unit for
initial thickening.
The sludge from the .DAF (at approximately 3% solids) is transferred to a Mix Tank where
polymer agents are added to enhance the dewatering process.
The semi -thickened sludge is transferred from the Mix Tank to a Rotary Filter for final
thickening, whereby the sludge is thickened to 6% solids.
The thickened sludge is then transferred to a Screw Press where it is dewatered to a
concentration of 9-20% solids.
Following the Screw Press, the sludge is dried in steam heated dryers to a concentration of
40-55% solids.
On the average, the weekly quantity of generated dried sludge is 13,000 Ib.
The dried, non -hazardous sludge is transported off-site to a commercial Subtitle D landfill.
This sludge is currently being disposed of at the Sampson County Landfill near Roseboro, NC.

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