Facility Planning, Low-Level Phosphorus Pilot Testing, and Various Upgrades
Client: City of Brookfield
Location: Brookfield, Wisconsin
The City of Brookfield operates the Fox River Water Pollution Control Center, a 12.5 mgd (51‑mgd peak) advanced wastewater treatment plant serving portions of Brookfield and six other Waukesha County communities. The City retained Donohue to develop a Facility Plan for this regional wastewater treatment facility.
The purpose of the Facility Plan was to develop an upgrade strategy to address foreseeable liquid-train issues that jeopardize effluent limit compliance throughout the 20-year planning period. The primary issues include a future low-level effluent phosphorus limit (0.075 mg/L), equipment age and reliability, and community growth.
The planning effort included evaluation of tertiary filtration upgrades for meeting low-level effluent phosphorus. The evaluation identified installation of new cloth-media filters into Brookfield’s existing sand filter building as the most cost-effective solution for permit compliance. In order to further evaluate treatment performance of the recommended upgrades, pilot testing was carried out utilizing a combination of chemical dosing and cloth-media filtration. The pilot testing demonstrated effluent quality in compliance with the 0.075 mg/L future phosphorus limit.
Another tool utilized during the evaluation was a calibrated dynamic activated sludge BioWin model. The long-term dynamic simulations produced insight-providing probability distributions that guided the development of operating strategies for meeting the low-level effluent phosphorus limit.
In addition to facility planning, Donohue has completed additional wastewater projects for Brookfield; they include:
- 2035 Facilities Plan
- Phosphorus Removal Study
- RAS Pump Station Improvements
- Aeration System Efficiency Improvements
- Disinfection System Upgrade
- Sewer Cleaning/Dewatering
- Digester Inspections
- Generator and Controls Replacement
- WPDES Permit Renewal/Application Assistance
- PE Splitter Structure Rehabilitation