Skip to main content

DESIGN AND OPERATION OF NUTRIENT REMOVAL PLANTS FOR VERY LOW EFFLUENT CONCENTRATIONS

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Out of a total of six plants with nitrogen removal in Norway, four plants use the MBBR (Moving Bed Biofilm Reactor) process. In all four cases the MBBR process was chosen because it offered a very compact treatment solution and because it had the lowest investment costs as well as the lowest total annual costs. All the MBBR plants use the combined denitrification process (pre-denitrification + post-denitrification) for nitrogen removal, followed by chemical precipitation for phosphorus removal. This type of design offers a lot of operation flexibility and enables the plants to produce very low effluent concentrations. External carbon sources used for post-denitrification at these plants are ethanol, methanol and monopropylene glycol. The plants have maximum design flows from 1,125 to 7,200 m3/h (7.1 to 45.6 mgd) and at least two parallel trains. All plants have primary clarifiers. Two of the plants use sedimentation for final solids separation, while the other two use dissolved air flotation. The paper presents typical design data for nitrification and denitrification in MBBRs, plus results from guarantee tests where a single train is operated at design load, as well as results from normal operation of the plants. With influent concentrations above 50 mg total N/L, the Gardermoen WWTP has demonstrated effluent concentrations < 2 mg total N/L and < 1 mg total inorganic N/L. For the year 2005 the Lillehammer WWTP had annual average effluent concentrations of 2.2 mg BOD5/L, 2.9 mg total N/L and 0.12 mg total P/L. Years of full-scale experience from MBBR plants in Norway, using combined pre- and post-denitrification plus post-precipitation, has documented that final effluent concentrations below 3 mg total N/L and 0.3 mg total P/L can be achieved at low wastewater temperatures and at acceptable capital and O & M costs.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864707787977433

Publication date: 2007-01-01

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 These proceedings are not peer reviewed.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