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Clarifier Rehabilitation Projects

DuPage County, Illinois

The DuPage County Woodridge-Greene Valley Plant is the largest of three DuPage County-owned wastewater treatment facilities. It is designed to clean 12 million gallons per day of wastewater. The Knollwood plant is among the other facilities.

Four final clarifiers at the DuPage County Greene Valley Wastewater Treatment Plant and four at the Knollwood plant had exceeded their useful life and required either replacement of all mechanisms or rehabilitation.  Milhouse  Engineering and Construction, Inc. (Milhouse) performed  condition  assessments  and  concluded  significant  savings  could  be realized by rehabilitation of the clarifiers, including the replacement of major elements.

Milhouse provided design and construction management services for the rehabilitation of the eight 110 foot diameter clarifiers.

Work included:

•  The replacement of fiberglass weirs
•  Sandblasting
•  Protective coatings
•  Structural repairs
•  Ground water valve repairs
•  Replacement or repair of main drives
•  Replacement of valve actuators

The replacement of the square serpentine weirs at the Greene Valley WWTP required the sourcing of tooling to mold the fiberglass circular serpentine weirs to match one existing clarifier .

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