Sidestream superoxygenation for wastewater treatment: Oxygen transfer in clean water and mixed liquor

Carlos M Barreto; Ivania M Ochoa; Hector A Garcia; Christine M Hooijmans; Dennis Livingston; Aridai Herrera; Damir Brdjanovic

doi:10.1016/j.jenvman.2018.04.035

Sidestream superoxygenation for wastewater treatment: Oxygen transfer in clean water and mixed liquor

J Environ Manage. 2018 Aug 1:219:125-137. doi: 10.1016/j.jenvman.2018.04.035. Epub 2018 May 5.

Authors

Carlos M Barreto¹, Ivania M Ochoa², Hector A Garcia³, Christine M Hooijmans², Dennis Livingston⁴, Aridai Herrera⁵, Damir Brdjanovic¹

Affiliations

¹ Department of Environmental Engineering and Water Technology, IHE Delft Institute for Water Education, Westvest 7, 2611AX Delft, The Netherlands; Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
² Department of Environmental Engineering and Water Technology, IHE Delft Institute for Water Education, Westvest 7, 2611AX Delft, The Netherlands.
³ Department of Environmental Engineering and Water Technology, IHE Delft Institute for Water Education, Westvest 7, 2611AX Delft, The Netherlands. Electronic address: h.garcia@un-ihe.org.
⁴ OVIVO Water - MBR Systems, 2404 Rutland Dr, Austin, TX 78758, United States.
⁵ JCI Industries, Inc., 1161 S.E. Hamblen Road Lee's Summit, MO 64081 Kansas City, Missouri, United States.

PMID: 29738932
DOI: 10.1016/j.jenvman.2018.04.035

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.

Keywords: Activated sludge; Aeration efficiency; Membrane bioreactor; Oxygen transfer; Speece cone; Wastewater treatment.

MeSH terms

Bioreactors*
Oxygen
Sewage
Waste Disposal, Fluid*
Wastewater*
Water

Substances

Sewage
Waste Water
Water
Oxygen