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Updated: May 27, 2026

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
Oxygen transfer in activated sludge--new insights and potentials for cost saving
1Institut IWAR, Technische Universität Darmstadt, Petersenstrasse 13, 64287 Darmstadt, Germany. jhenkel@mines.edu
Abstract:
The alpha-factor has the greatest impact on the calculation of the required standard oxygen transfer rate (SOTR) in activated sludge systems equipped with submerged aeration systems. Knowing the dependencies of the alpha-factor leads to a better design of the aeration devices and, consequently, to a more efficient use of aeration energy. Applying the current state of knowledge about oxygen transfer leads to the conclusion that, in contrast to current opinion, simultaneous aerobic stabilization requires the same SOTR as conventional activated sludge systems with advanced nutrient removal, even though a higher organic load is degraded.
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