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Operating Experience with Large CSO Control Facilities

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Nine facilities for storing and treating combined sewer overflows (CSO) are in operation on the Rouge River in metropolitan Detroit. These facilities provide screening, chlorination and storage of CSO, and they have a total peak flow capacity of 3,600 cfs and a storage volume of 60 million gallons. The facilities are being monitored to assess their performance and water quality benefits for future phases of CSO control in the Rouge. In the meantime, the operating data collected since June 1997 provide important information on design. This paper discusses several aspects of CSO facility operations:

Staff Training

Overall O&M Costs

Use of SCADA and Mobile Staffing

Pacing and Control of Hypochlorite Dosage

Solids Flushing Procedures

Dealing with Low Influent Flow Rates

Exploring Potential New Operating Practices

The nine CSO facilities include three operated by the City of Detroit Water and Sewerage Department, three operated by the Oakland County Drain Commissioner, and three operated by the Wayne County Department of Environment. All of these facilities have been constructed as part of watershed restoration efforts on the Rouge River. These other efforts include illicit discharge elimination, storm water management, abandoned dump remediation, and habitat and recreational improvements.

Overall, the operating experience with the Rouge River CSO control facilities is providing valuable information for designing future phases of CSO control on the Rouge and for communities engaged in CSO control in other watersheds. It is also helpful in identifying opportunities to enhance operational practices for CSO control.
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Document Type: Research Article

Publication date: 2000-01-01

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