Modeling and Implementation of Flocculation Zones in Rectangular Final Settling Tanks at the Newtown Creek Water Pollution Control Plant

Authors: Griborio, Alonso; O'Connor, Patrick; Federici, Nat J.; Giardina, Frank; Fortin, John; Pitt, Paul; Dailey, Sarah; Husband, Joseph; Koch, Carl

Source: Proceedings of the Water Environment Federation, WEFTEC 2008: Session 41 through Session 50 , pp. 3689-3706(18)

Publisher: Water Environment Federation

Buy & download fulltext article:


Price: $17.50 plus tax (Refund Policy)


The Newtown Creek Water Pollution Control Plant (WPCP), designed for 310 MGD average daily flow (ADF), is one of fourteen WPCPs owned and operated by the New York City Department of Environmental Protection (NYCDEP). The facility, which is the only NYCDEP plant operating without Primary Settling Tanks, is currently undergoing a plant-wide upgrade that includes increasing the biological treatment facilities by 50% (from two to three batteries) and changing the process from High Rate Modified Conventional Activated Sludge operation to Low Solids Retention Time (SRT) (1.8 – 2.2 days) Step Feed Activated Sludge operation. The plant is currently operating under an interim permit with new secondary treatment permit limits scheduled to go into effect at the conclusion of construction. A demonstration program was initiated in two existing test tanks to optimize dry and wet weather operating strategies and the operation of the flocculation zones that were installed at the head end of the final settling tanks. The flocculation zones were added because the plant had experienced previous bioflocculation problems: Flocculated Suspended Solids (FSS) results significantly below Dispersed Suspended Solids (DSS) results). In order to evaluate the performance of the test tanks, they were constructed in a way that isolated them from the existing plant. Additionally, a state-of-the-art Computational Fluid Dynamics (CFD) model was used to test the effectiveness of the flocculation zones in the Final Settling Tanks, and to optimize their design.

Document Type: Research Article


Publication date: January 1, 2008

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites



Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page