Skip to main content

Oxygen Mass Transfer in a Flow-through Hollow-fiber Membrane Aeration Reactor

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

The increasing use of membrane-aerated biofilm reactors in wastewater treatment necessitates more accurate understanding of their oxygen transfer capabilities for design and operation purposes. The oxygen mass transfer in a hollow-fiber membrane-aerated biofilm reactor (HFMBR) was evaluated using conventional clean water testing, and results were compared to performance data and oxygen microsensor profiles when an active nitrifying biofilm was present on the fibers. Using a flow-through configuration (as opposed to sealed end fibers), conventional mass transfer testing predicted oxygen transfer efficiencies between 6% and 40%, depending on air flow rate through the fibers and lumen pressure. The mass transfer coefficient (average = 2.8 x10−4 cm/sec) was found to be largely independent of air flow rate but had a slight positive correlation with lumen pressure (correlation coefficient = 0.5), possibly due to radial deflection of the siloxane fibers. With an active nitrifying biofilm (predominantly nitritation), significantly higher oxygen transfer efficiencies were observed, between 40% and 62%, as measured by outlet gas oxygen concentration, ammonia consumption stoichiometry, and oxidized nitrogen production stoichiometry, all of which were in reasonable agreement. Oxygen microsensor profiles in active biofilm and on bare fibers suggest that one reason for this discrepancy is the reduced surface dissolved oxygen (DO) concentration at the membrane-biofilm interface. Bulk liquid DO measurements lead to an overestimation of the mass transfer driving force and, as a result, an underestimation of the mass transfer coefficient (KOL). These results demonstrate substantial limitations when applying conventional oxygen transfer testing methods (based on bulk liquid DO concentration) to design of membrane-aerated biofilm reactors.
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: HOLLOW-FIBER MEMBRANE BIOFILM REACTOR; MASS TRANSFER COEFFICIENT; MICROSENSOR; OXYGEN TRANSFER

Document Type: Research Article

Publication date: 2007-10-01

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