The Performance of Unconfined Hollow Fiber Membranes as Pipe Flow and Mixed Flow Aerators

by Drew W. Johnson, Univ of Minnesota, Minneapolis, United States,
Michael J. Semmens, Univ of Minnesota, Minneapolis, United States,

Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment


Unconfined gas permeable membranes situated within mixed reactors are currently being evaluated as a viable technology for gas transfer. The use of sealed hollow fiber membranes that are pressurized with pure oxygen provides rapid and effective gas transfer without bubbles. The ability for gas transfer without bubble formation makes this technology especially well suited for environments where the gas stripping of VOCs (volatile organic compounds) is of concern. The kinetics of gas transfer are fast and well defined since the interfacial area is known and the driving force for transfer is large. In this paper, mass transfer correlations are presented for unconfined membranes which allow the performance of membrane aerators to be compared with other gas transfer technologies.

Subject Headings: Membranes | Gas flow | Wells (oil and gas) | Aeration | Volatile organic compounds | Stripping (chemical) | Fabrics

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