Phosphorus and Nitrogen Profile Measurements to Understand, to Locate and to Deal with Phosphorus Limitation in a Fixed Bed Filter

Authors: Scherrenberg, S.M.; Neef, R.; Menkveld, H.W.H.; van der Graaf, J.H.J.M.

Source: Proceedings of the Water Environment Federation, Nutrient Removal 2009 , pp. 1038-1049(12)

Publisher: Water Environment Federation

Buy & download fulltext article:

OR

Price: $17.50 plus tax (Refund Policy)

Abstract:

The European Union presented in 2000 the European Water Framework Directive (WFD). Within the WFD approach the focus is more and more on ultra low nitrogen (<2.2 mg N-total/L) and phosphorus concentrations (<0.15 mg P-total/L) in waste water treatment plant (WWTP) effluent. Nitrogen concentrations of 2.2 mg N-total/L can be reached with denitrifying filters as a tertiary treatment step. When combining nitrogen and chemical phosphorus removal in a filter, phosphorus limitation may occur. After nitrite accumulation, caused by phosphorus limitation, was measured in the filtrate water of the dual media filter, research has started to locate, to understand and to solve the problem. Profile measurements for nitrate, nitrite and orthophosphorus (PO4-P) combined with COD and O2 were conducted. Results show that the minimal required PO4-P/NOx-N ratio is 0.006 mg/mg after coagulation and flocculation. Profile measurements have proven to be a useful tool. It showed how nitrate and orthophosphorus are removed through the filter bed and it showed the consequences for the PO4-P/NOx-N ratio. When orthophosphorus is removed more rapidly compared to nitrate the PO4-P/NOx-N ratio decreases. When the PO4-P/NOx-N ratio becomes below 0.006 mg/mg for a certain period of time, orthophosphorus limitation occurs. The solution can be either changing the filter bed configuration or decreasing the coagulant dosage.

Keywords: 1-STEPĀ©; Profile measurements; dual media filtration; phosphorus limitation

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864709793901040

Publication date: January 1, 2009

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 These proceedings are not peer reviewed.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

Tools

Key

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