The City of Gardiner owns and operates a secondary wastewater treatment plant that serves the communities of Gardiner, Farmingdale, and Randolph in Maine. Located in South Gardiner, the plant has the capacity to treat up to 4.5 million gallons of wastewater per day, removing conventional pollutants and metals through its advanced treatment process.
Utilizing rotating biological contactors (RBCs) as its biological process, the Gardiner Treatment Plant employs a plastic material called media to grow a biological film full of microorganisms and bacteria. This film breaks off the RBCs and settles in clarifiers, where it is then processed into sludge. The sludge is transported to Unity, Maine, where it is used to produce a Class A Compost Product by Casella Waste Systems. The plant's main objective is to protect the drinking water supply and maintain water quality in the Kennebec River, ensuring the preservation of public use and aquatic life.
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