Frey, W. P. (1996). Ein Beitrag zur Charakterisierung von Belüftungssystemen für die biologische Abwasserreinigung nach dem Belebungsverfahren mit Sauerstoffzufuhrmessungen (Vol. 134). Inst. für Wassergüte u. Abfallwirtschaft, TU Wien. http://hdl.handle.net/20.500.12708/519
After a short review about mass transfer of air bubbles in water a description of experimental methods and methods of evaluation connected to oxygen transfer is given. Practical experience and the results from different oxygen transfer measurements allowed to describe interactions between the layout of these measurements and influencing factors. The results obtained from operating wastewater treatment plants and some basic ideas about oxygen transfer were used to generate specific sorption- and gas dispersion numbers. It was possible to correlate these numbers to different systems of gas spargers. These correlations led to the description of basic process characteristics for different aeration systems and provide applicable tools for the design and operation of aeration systems.