Skip to main content

An Innovative Approach to CSO Control can Reduce Costs

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The Detroit Water and Sewerage Department (DWSD), in developing the Long Term CSO Control Plan, estimated that the cost of capital improvements needed to control CSO discharges would exceed 1 billion. Of particular concern are those discharges to the Detroit River. Real estate along the heavily urbanized river is among the highest valued property within the City. Using that property for pollution control facilities would likely generate protests from many different quarters. Therefore, DWSD is recommending an innovative screening and disinfection approach to reduce the impacts of CSOs on the Detroit River.

To accomplish the mission, underground structures were designed for two pilot facilities to convey the CSO flows through 4mm raked bar screens produced by two different manufacturers. The screens, developed in Europe, direct the solids to the wastewater treatment plant through a side stream. These screens do not require residuals to be collected and transported from these remote facilities. This is a major benefit because hauling the screenings through high value residential and commercial areas is judged to be unacceptable. In order to judge the efficiency of the screens, both types will be compared side by side in one of the structures.

To maximize the mixing of the disinfectant, high-energy mixers were included in chambers located after the screening equipment. The rapid mixing caused by these high-energy mixers will help maximize the bacterial kill and minimize the disinfectant discharged to the Detroit River.

The discharges from the facilities are directed into large diameter pipes that will provide sufficient volume to provide the minimum 10 minutes disinfection contact time at the design flow. The plan maximizes the use of existing sewers to provide the volume for disinfectant contact, thereby minimizing the need for new construction on riverfront properties. Also included are control structures, instrumentation and control devices that will control the flows to maximize disinfectant contact time.

If the use of this innovative screening and disinfection approach is successful, the citizens of Detroit will save a substantial portion of the estimated cost to construct retention basins, as well as reduce the impact of such facilities on scarce riverfront real estate.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2000-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more