INTEGRATING NITRIFYING TRICKLING FILTERS INTO BIOLOGICAL NUTRIENT REMOVAL ACTIVATED SLUDGE FOR IMPROVED SYSTEM PERFORMANCE

Authors: Hu, Zhi-Rong; Wentzel, Mc; Ekama, Ga

Source: Proceedings of the Water Environment Federation, WEFTEC 2001: Session 51 through Session 60 , pp. 596-606(11)

Publisher: Water Environment Federation

Buy & download fulltext article:

OR

Price: $17.50 plus tax (Refund Policy)

Abstract:

A biological nutrient removal (BNR) activatedsludge (AS) scheme incorporating external nitrification in a fixed media system is evaluated. A laboratory scale investigation of the scheme indicates that it holds considerable potentialfor BNRAS system intensification through major reduction in sludge age and oxygen demand and significant improvement in sludge settleability. Because the BNRAS system is not required to nitrtfy, its anoxic mass fraction can be considerably enlarged at the expense of the aerobic mass fraction creating conditions that (i) allow it to achieve high N removals with domestic wastewaters with high TKN/COD ratios and (ii) promote anoxic P uptake polyphosphate accumulating organisms (PAO) to develop in the system. From this, andearlier investigations with conventional BNR systems, it appears that anoxic P uptake biological excess P removal (BEPR) is only about 2/3rds of aerobic P uptake BEPR. Inclusion of anoxic P uptake PAOs in, and exclusion of nitrtfiers from, the BNRAS system are not essentialfor the scheme. However, conditions that promote aerobic P uptake to maximize BEPR, are also conducive to nitrifier growth, which, if supported in the BNRAS system, would require virtual complete nitrification in the fixed media system to avoid nitrate interference with BEPR. Before the scheme can be implemented at large scale, an engineering and economic evaluation is required to quantify its potential benefits and savings.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864701790860452

Publication date: January 1, 2001

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 These proceedings are not peer reviewed.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