Research Seminar Series

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  • Tom Tarento, Link Building (J13) 108,
  • Golnoosh Torabian, Link Building (J13) 108,

Ozonation Kinetics in an In Situ Ozone Generator-Reactor

Professor Alexander Mathews
Kansas State University
Manhattan, Kansas, USA
Venue: Common Room, Room 407, Level 4
J01 Chemical Engineering Building
Date: Thursday 15 October 2015
Time: 11am
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Seminar details

A number of commonly used chemicals such as dyes, pharmaceuticals, cosmetics and hormones are entering receiving waters due to the inability of wastewater treatment systems to remove such compounds. These chemicals are concern due to their toxicity and carcinogenicity to humans and aquatic organisms. Ozone is a powerful oxidant that can be used to oxidize such compounds in effluents. The application of ozone is somewhat limited due to mass transfer limitations, and the lack of understanding of fundamental mechanistic factors that contribute to poor utilization of applied ozone. Mass transfer of ozone form the gas to the liquid phase has been reported to be the main rate limiting step in ozonation. In the case of high molecular weight compounds, the diffusion and transport of the compound in the hydrodynamic film, the production of byproducts and secondary reactions of byproducts and ozone, can also influence the overall oxidation kinetics. In this presentation the kinetics of oxidation of a high molecular weight anthraquinone dye in a novel in situ ozone generator and reactor is analyzed in terms of fundamental principles of absorption, reaction, and hydrodynamics. The oxidation kinetics model for the dye is based on the consideration of a fast dye decolorization reaction and a slow reaction of ozone with the primary products from the first reaction. Gas-liquid reactions can occur in the liquid film, the bulk liquid, or a combination of both. Experimental data for the oxidation of high molecular weight dyes along with model description, verification, and sensitivity analyses to optimize the performance of the in situ ozonation system will be presented. Comparison with conventional stirred tank ozonator will also be provided.