Skip to main content

Kinetic/Half-saturation Coefficient Considerations for Post Denitrification MBBR

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

To understand better Moving Bed Biofilm Reactor (MBBR) post denitrification process robustness to very low level of nitrate+nitrite (NOx-N) < 1 mg/L, and possible kinetic limitations to achieve these low levels, pilot was implemented at the Blue Plains AWTP between December 2007 and early July 2008. Kinetics of microbial growth govern the utilization of the substrate and the production of the biomass; hence it was important to understand the limitations of the substrate (usually expressed as Ks (half-saturation coefficient)) on the overall denitrification rates. Total of four 100-gallon anoxic pilot reactors (each filled with 30% by volume of Hydroxyl 515® plastic media) were used for this testing. Two types of in-situ Specific Denitrification Rate (SDNR) batch tests were conducted throughout this piloting - one with NOx-N limitations and one with biodegradable soluble COD (bsCOD) limitations. Both types of tests were conducted with excess phosphorus. During the tests, SDNR was estimated by measuring the rate of consumption of NOx-N over time. At an ambient temperature of 17°C, Ks,NOx-N (Ks for nitrate limited test) was 2.5 mg/L on average, and Ks,bsCOD (Ks for bsCOD limited test) was 6.5 mg/L. During the cold temperature period (13.5°C), Ks,NOx-N was 2.4 mg/L on average while Ks,bsCOD concentration was not a definitive finding. This study supported previous reports indicating the need for residual bsCOD of 10–15 mg/L in anoxic zones. In-situ SDNR data were used to develop a reasonable model for the MBBR system, based on the double Monod relationship. It was estimated that rmax (maximum denitrification rate) = 4.7 g/m2/d, Ks,NOx-N = 3.5 mg/L and Ks,bsCOD = 9.7 mg/L. Half-saturation coefficient was found to be a very important design consideration for fixed film polishing application.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: ENR; Half-saturation; Kinetic Limitation; Limit of Technology (LOT); Moving Bed Biofilm Reactor (MBBR); Post Denitrification

Document Type: Research Article

Publication date: 2009-01-01

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