Wastewater Treatment
Brodhead, Wisconsin
In 1993, Foth was retained to review the existing wastewater treatment facility to improve operation. The wastewater treatment facility experienced periods of high flows and poor BOD removal. Foth worked closely with city personnel during the review process. The review identified numerous design deficiencies and noted that the WPDES permit was due to expire in 1994. The new WPDES permit contained additional sludge storage and phosphorus removal limitations. In order to meet the new WPDES limits and eliminate design deficiencies, Foth was retained to design and oversee construction of a new wastewater treatment facility.
The new wastewater treatment facility includes raw wastewater pumping controlled off of VFD drives, mechanical screening, grit removal, biological phosphorus removal, oxidation ditch, final clarification, ultraviolet disinfection, aerobic sludge digestion, RAS sludge pumping off of VFD drives, and sludge storage. A programmable logic controller is used for alarm and process control. Monitoring for process control is routed through a personal computer.
Plant Design
Average flow ...................................597,000 gpd
Peak flow ...................................3,000,000 gpd
BOD ...................................967 lbs/day
TSS ...................................1,028 lbs/day
Phosphorus ...................................33 lbs/day
Benefits:
- Foth assisted the city in receiving a low interest loan from the Clean Water Fund loan program.
- Creativity and teamwork between Foth and the City of Brodhead resulted in a wastewater treatment plant that meets the city's needs and budget.
- Biological phosphorus removal reduced the amount of sludge produced and allowed for a significant reduction in the size of the aerobic digesters and sludge storage tank.
- The wastewater treatment facility was designed for future expansion and for the addition of a gravity belt thickener.
