White Paper | May 7, 2012

Cost-Effective Plant Renovation Proves Itself

Source: Sanitaire -- A Xylem Brand

Innovative design combined with state-of-the-art wastewater treatment equipment and processes have played a key role in the effluent quality and energy efficiency achieved at the award-winning Fond du Lac Regional Wastewater Treatment Plant. Rather than build totally new facilities, this plant adapted existing elements to resolve bypass problems, to double hydraulic capacity, to comply with a stringent ammonia rule change and to improve the sludge management program, all at less energy usage than the much smaller earlier plant. Here’s how they did it…

The $61M renovation of the Fond du Lac (WI) Regional Wastewater Treatment Plant (WWTP) has earned an impressive string of awards for design and operational excellence, including recognition from the American Council of Engineering Companies (ACED), American Public Works Association, American Society of Civil Engineers and from Alliant Energy, the plant’s electric utility.

Like other plants across the nation, the Fond du Lac plant has had to respond to ever more stringent water treatment standards since the US Clean Water Act emerged from Congress. With federal and state regulatory agencies emphasizing effluent quality, the city utility committed to producing a new generation facility with advanced treatment capabilities capable of delivering more efficiency and cost effective operations. The project was driven primarily by an impending rule change in the plant’s discharge permit aimed at limiting ammonia effluent levels. Saddled with a treatment process incapable of compliance with the new ammonia rule, the utility elected to expand the scope of the upgrade to address other longstanding needs for more hydraulic capacity, improved energy efficiency; elimination of bypasses into Lake Winnebago during high rainfall; reduced operating costs and a better sludge management program.

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