A Two-Phase Computational Fluid Dynamics Model for Ozone Tank Design and Troubleshooting in Water Treatment

Authors: Ta, C.; Hague, J.

Source: Ozone: Science and Engineering, Volume 26, Number 4, August 2004 , pp. 403-411(9)

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Abstract:

A computational fluid dynamics (CFD) tool was employed to design and study ozone contactors. The emphasis was to achieve the desired flow distribution. The Eulerian-Eulerian multiphase model was used with the standard k- egr

turbulent model. The water surface was slip wall boundary and was specified as a sink to remove ozone bubbles. For a single-column contactor with side entry, the flow pattern was found to be crucially dependent on both the direction and magnitude of the entry velocity from the inlet pipe. It was difficult to achieve uniform gas concentration over the contactor volume. In a multicompartment contactor, the countercurrent flow resulted in a mixed flow condition and the mixing increased with a higher gas rate. For the cocurrent flow, water was accelerated by the gas and the plug flow pattern was achieved. The flow distribution in each compartment can be significantly different even though the overall residence time distribution curves are similar.

Keywords: Ozone; Computational Fluid Dynamics; Contactor Design; Modeling

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01919510490482313

Affiliations: 1: Kempton AWTW, Thames Water, Research and Technology, Hanworth, Middlesex, United Kingdom

Publication date: 2004-08-01