Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

A novel 2-sludge 3-stage process using a combination of granular sludge and biofilms was developed to achieve biological removal of nitrogen and phosphorus from high-strength industrial wastewater. The system consists of a granular sequencing batch reactor (SBR) working under alternating anaerobic/anoxic/aerobic conditions and an aerobic biofilm SBR. The wastewater is first fed to the granular SBR, where easily biodegradable carbon is taken up primarily by polyphosphate accumulating organisms. The supernatant resulting from a quick settling of the granular sludge is then fed to the biofilm SBR for nitrification, which produces oxidised nitrogen that is returned to the granular reactor for simultaneous nitrate and phosphorus removal. While maximising the utilization of organic substrate and reducing operational costs, as do other 2-sludge processes previously reported in literature, the proposed system solves the bottleneck problem of traditional two-sludge systems, namely high effluent ammonia concentration, due to its high volume exchanged ratios. An ammonia oxidation rate of 32mgN/L.h was achieved in the biofilm SBR, which produced nitrite as the final product. To avoid P-uptake inhibition by nitrite, the nitrite-containing stream was continuously fed to the granular reactor in the anoxic phase. The system currently achieves a nitrogen and phosphorus removal efficiency of 85% and 50%, respectively. The effluent is suitable for land application or for discharge to domestic wastewater treatment plants.
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: 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 These proceedings are not peer reviewed.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
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