Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The City of West Lafayette, Indiana (City), faced with the challenge of reducing combined sewer overflow (CSO) to the Wabash River, addressed future CSO control regulations by developing the West Lafayette Wastewater Treatment Plant Facilities Plan in 1993. In 1996, the City prepared Amendment No.1 to the facilities plan presenting various wastewater collection system improvements including the Wet Weather Treatment Facility. The facility, located adjacent to the wastewater treatment plant, would provide settleable solids removal and disinfection of flows in excess of the plant capacity. Partnering with the City of West Lafayette, Malcolm Pirnie, Inc. evaluated alternatives and designed the facility.

The alternative initially recommended for CSO treatment was comprised of four vortex separators and chemical disinfection. During preliminary design of the Wet Weather Treatment Facility, performance was discussed with representatives of two major vortex separator manufacturers. Based upon the units installed to date, the performance of vortex separators has been much less than initially expected. In fact, the data indicate that a vortex separator can be expected to achieve no more than ten percent net solids removal. This low removal rate led to the evaluation of other alternatives.

A rectangular basin was evaluated and compared to the vortex separators' solids removal, volume, disinfection contact time and cost. One basin of almost double the volume of four vortex separators could be constructed at approximately the same capital cost. The rectangular basin would provide 20 minutes of chlorine contact time at the design flow whereas four vortex separators provide 10 minutes. It also is anticipated that the rectangular basin would provide more solids removal than the vortex separators. Additionally, the rectangular basin would be capable of capturing a greater volume of overflow resulting from small storms, thereby providing treatment for a greater number of storm events. Based upon these benefits, the City proposed construction of a rectangular basin for treatment of excess wet weather flow.
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: 2002-01-01

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