Skip to main content

ENHANCED BNR WITH MBR – A UNIQUE COMBINATION

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Over the past decade the application of membrane bioreactor (MBR) technology has grown exponentially in terms of number of plants and capacity of wastewater treated. Most of these facilities are designed for nitrification/denitrification and some for phosphorous removal using chemical precipitation. More recently there has been a significant interest in enhanced biological nutrient removal (EBNR) using MBR technology to capitalize on the benefits of these two advanced technologies. Enhanced BNR and MBR is a unique combination since the enhanced BNR process provides excess phosphorous accumulation in the biomass and the MBR process provides excellent solids-liquid separation which ensure virtually no solids in the treated effluent.

The Cauley Creek WRF (Georgia, U.S.A.) utilizing ZeeWeed® MBR technology has been operating since May 2002 using ferric chloride addition to achieve effluent TP less than 0.13 mg/L. As part of the planning process to double the capacity to 5 mgd, the Owner wanted to reduce operating costs by converting the plant to an enhanced BNR process with chemical trimming for TP removal. Detailed wastewater characterization and Bio Win modeling showed that a Johannesburg type configuration was the preferred approach. The existing bioreactor tankage was retrofitted to an enhanced BNR process to treat the same capacity of 2.5 mgd by installing new concrete baffles and flow splitter boxes. A new mirror image plant was built for the additional 2.5 mgd. The results from actual operation during the first fall/winter showed that the dosage of ferric chloride and caustic were reduced by approximately 50% as compared to chemical P removal to achieve the same effluent TP limit, indicating significant Bio-P removal. The plant also achieved excellent nitrification/denitrification with effluent ammonia-N below 0.5 mg/L and nitrate-N below 5 mg/L.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2005-01-01

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
X
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