Aeration and Mixing in Loop Reactors Equipped With Fine Bubble Diffusers and Slow Speed Mixers: A Full Scale Study

$17.50 plus tax (Refund Policy)

Buy Article:


Mixing and aeration characteristics obtained on three full scale loop reactors for 28 configurations (different mixers' location and rotation speed, air flow rates and diffuser grids' location) were analyzed. The propellers' thrust was measured in situ. Observed values vary with the tank geometry, the location of the mixers and the induced axial velocity. in situ thrust values are lower than the nominal ones obtained during shop tests, by 10 to 30 %. For the nominal rotation speed of the propellers, observed thrust-to-power ratios are comprised between 685 and 875 N kW−1. In agreement with previous results, an increase in the oxygen transfer rate with the axial velocity was observed, due to a partial neutralization of the spiral flows formed at the edge of the aerated zones. Aeration efficiency is not decreased, as the additional power consumption due to mixing is offset by the oxygen transfer enhancement. SAE values are comprised between 2.0 and 2.6 kg O2 kWh−1. Such on site results are especially important to be used as input and output data in CFD models.

Keywords: Aeration; fine bubble; mixing; thrust; wastewater treatment

Document Type: Research Article


Publication date: January 1, 2011

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 These proceedings are not peer reviewed.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



Share Content

Access 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
Cookie Policy
Cookie Policy
ingentaconnect 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