The Field's Point Wastewater Treatment Facility (WWTF) upgrade employs the largest integrated fixed-film activated sludge (IFAS) treatment process in the world for biological nutrient removal.

Challenge: To reduce nitrogen levels in the Providence River and Narragansett Bay, and to meet Rhode Island Pollution Elimination System effluent permit limits, the Narragansett Bay Commission (NBC) pursued options to provide enhanced treatment at the Fields Point WWTF. The Commission selected the IFAS upgrade alternative, while stipulating the wastewater treatment plant operate at peak efficiency and within required treatment limits throughout the four-year modernization and construction effort.

Solution: Kleinfelder investigated alternative biological nitrogen removal processes, including the associated modifications and costs, necessary to achieve potential seasonal and year-round effluent nitrogen standards. The IFAS process offered the most cost-effective and constructible solution to meet a 5 mg/l seasonal nitrogen removal limit. Kleinfelder also designed new operations and administration buildings to complement existing structures and create an integrated campus.

Project Results: Kleinfelder developed a solution that meets regulatory requirements and will provide an efficient and modern WWTF that can effectively serve the community over the long term, while improving the area’s water quality. The project also is scheduled for completion one year ahead of schedule.