Baby Creek Screening and Disinfection Facility
The Baby Creek facility is another screening and disinfection facility that uses fine screens and disinfection to treat combined sewage flows that pass through it. It is located at Miller and Industrial Drive in southwest Detroit at the city limit shared with Dearborn. The facility is rated for 5,100 cfs. The site area includes the Woodmere Pumping Station that services a 450-acre portion of the Baby Creek tributary area.
Belle Isle CSO RTB
The Belle Isle CSO RTB is the smallest RTB and was sized to provide 10 minutes of detention for the peak flow of the 10-year, 1-hour storm. Located on Belle Isle along the Detroit River, this RTB has a storage capacity of 300,000 gallons. It eliminated one untreated CSO outfall and has been operational since March 2008.
Conner Creek CSO RTB
Detroit’s largest CSO control facility, the Conner Creek CSO RTB eliminated three outfalls and has dramatically improved water quality in Conner Creek and the Detroit River since going into operation in November 2005. This RTB provides 62 million gallons of total storage, with 30 million gallons in the retention treatment basin and 32 million gallons in upstream structures. High-speed mixers are used to rapidly disinfect flows and achieve the required fecal coliform limits. This facility was sized to provide 5 minutes of detention for settling and disinfection for the peak flow from the 10-year, 1-hour storm. DWSD has been working with DTE Energy to support efforts to attract wildlife to this upper reach of the Detroit River through a more naturalized site along the river, near the RTB and adjacent to the Connor Creek Power Plant and the Bayview Yacht Club.
Hubbell-Southfield CSO RTB
The Hubbell-Southfield CSO RTB is one of DWSD’s most active, longest operating CSO facilities and the largest on the Rouge River. Since August 1999, it has been effectively capturing and treating combined sewage through screening, settling and disinfection to meet discharge permit requirements that protect public health. Sized to fit into the available land and site constraints, the basin has a 22 million gallon storage capacity. Located next to the Tournament Players Championship Golf Course (TPC) in Dearborn, this RTB serves as an example of how these facilities can be good neighbors and blend in with the surrounding environment. The facility features an innovative design component that enables three different operational modes within the RTB and prevents resuspension of solids during large storms with high flow rates.
The Leib facility was constructed to address a large outfall on the Detroit River and to demonstrate the effectiveness of fine screening (horizontal and vertical) in combination with 10 minutes of disinfection time for the design flow to meet protection of public health standards. High-energy mixers are being used to mix sodium hypochlorite to maximize bacterial kill and minimize discharge of residual chlorine to the Detroit River. The facility can treat a flow rate of up to 1,500 cfs. It began operation in 2002 and successfully achieved the required treatment levels during the demonstration period.
The Oakwood CSO RTB is currently under construction and is expected to be placed in service by the end of 2012. Located on the lower portion of the Rouge River immediately south of I-75, the 9-million-gallon RTB is designed to provide CSO treatment through storage plus fine screening and disinfection. This facility includes a major influent pumping station with capacity to pump 1,800 cubic feet per second (cfs). Once completed, this pumping station will replace the existing pumping station and increase the level of service for the Oakwood District and help alleviate basement flooding in the upstream area.
Located in Eliza Howell Park, the Puritan-Fenkell CSO RTB is the third Rouge River CSO RTB. This facility successfully demonstrated that a facility sized to provide 20 minutes of detention time for settling and disinfection of the 1-year, 1-hour storm event peak flow is sufficient to meet protection of public health standards. The 2.8-million-gallon facility became operational in August 1999 and eliminated two untreated CSO outfalls.
DWSD’s Seven Mile CSO RTB was constructed at the same time as the Hubbell-Southfield and Puritan-Fenkell CSO RTBs with funding from the Rouge River National Wet Weather Demonstration Program. Located on the northeast corner of West Seven Mile Road, the roof of the basin also serves as the parking lot for the Greater Grace Temple. The RTB is sized to provide 30 minutes of detention time for settling and disinfection of the 1-year, 1-hour storm event peak flow. It has a 2.2 million gallon storage capacity. Two untreated CSO outfalls were eliminated when it went into operation in December 1998.
The St. Aubin facility was undertaken at the same time as the Leib facility; it uses the same technology but a different type of screen. While St. Aubin is much smaller, with about one fifth of the treatment capacity of Leib, it is important in addressing water quality along Chene Park that frequently hosts concerts and other events. This facility has operated successfully since 2002.