SCE&G Wateree Station - FGD Scrubber

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Wateree Station – Flue Gas Desulphurization (FGD) Scrubber

Scrubbers are used in U.S. power plants to meet emissions standards set by the U.S. Environmental Protection Agency (EPA). New regulatory programs call for further reduction of sulfur dioxide (SO2) emissions from coal-burning power plants. Flue gas systems frequently use limestone-forced-oxidation scrubbers to convert SO2 in the flue gas to gypsum, which can be sold for wallboard manufacturing, cement additive, or agricultural applications, thus turning a waste stream into a usable resource. Landfills are necessary for the disposal of the gypsum byproduct when demand for the gypsum falls short of the production.

Our firm provided engineering services in support of the Wateree Station FGD scrubber projects for South Carolina Electric & Gas including the design, permitting, and construction quality assurance for the FGD scrubber blowdown wastewater pond.  Duties included: coordination with concurrent scrubber project construction, facility layout, wastewater treatment modeling, pump station and force main design, permitting, and construction bid document preparation.  Project highlights included a multi-bay, composite-lined treatment facility with influent and effluent HDPE force mains designed to be fully functional over a wide range of operating temperatures. Site layout required extensive coordination with adjacent FGD scrubber construction project and planning for the management of a large quantity of stockpiled construction debris and asbestos waste.

We prepared a Landfill Location Restriction Study and Permit to Construct application for a new Class 3 industrial solid waste landfill for the disposal of the gypsum byproduct. The lined landfill is designed for disposal of 17.6M cubic yards of FGD scrubber waste materials and includes a wastewater basin and pump station system.

We also prepared construction plans and specifications for the construction of a lined wastewater/leachate pond, a 2,000 gallon per minute pump station, and a 10-inch HDPE force main. The project was designed to transfer wastewater and leachate from the lined Class 3 industrial solid waste landfill to the Wateree Station ash sluicing ponds and for discharge through the NDPES outfall.