Sidestream superoxygenation for wastewater treatment

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Sidestream superoxygenation for wastewater treatment

Oxygen transfer in clean water and mixed liquor

Journal Article (2018)

Author(s)

Carlos M. Barreto (TU Delft - Applied Sciences, IHE Delft Institute for Water Education)

Ivania M. Ochoa (IHE Delft Institute for Water Education)

Hector A. Garcia (IHE Delft Institute for Water Education)

Christine M. Hooijmans (IHE Delft Institute for Water Education)

Dennis Livingston (OVIVO Water - MBR Systems)

Aridai Herrera (JCI Industries, Inc.)

Damir Brdjanovic (TU Delft - Applied Sciences, IHE Delft Institute for Water Education)

Research Group

BT/Environmental Biotechnology

Wastewater treatment Activated sludge Membrane bioreactor Oxygen transfer Aeration efficiency Speece cone

DOI related publication

https://doi.org/10.1016/j.jenvman.2018.04.035 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:39975859-fd4f-4da9-8120-38fc1423506a

More Info

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Publication Year

2018

Language

English

Research Group

BT/Environmental Biotechnology

Volume number

219

Pages (from-to)

125-137

Downloads counter

198

Abstract

The performance of a pilot-scale superoxygenation system was evaluated in clean water and mixed liquor. A mass balance was applied over the pilot-scale system to determine the overall oxygen mass transfer rate coefficient (K_La, h⁻¹), the standard oxygen transfer rate (SOTR, kg O₂ d⁻¹), and the standard oxygen transfer efficiency (SOTE, %). Additionally, the alpha factor (α) was determined at a mixed liquor suspend solids (MLSS) concentration of approximately 5 g L⁻¹. SOTEs of nearly 100% were obtained in clean water and mixed liquor. The results showed that at higher oxygen flowrates, higher transfer rates could be achieved; this however, at expenses of the transfer efficiency. As expected, lower transfer efficiencies were observed in mixed liquor compared to clean water. Alpha factors varied between 0.6 and 1.0. However, values of approximately 1.0 can be obtained in all cases by fine tuning the oxygen flowrate delivered to the system.