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The Synergistic Effect of Ozonation and Photocatalysis on Color Removal from Reused Water

Zou, Linda and Zhu, Bo (2008) The Synergistic Effect of Ozonation and Photocatalysis on Color Removal from Reused Water. Journal of Photochemistry and Photobiology A: Chemistry, 196 (1). pp. 24-32. ISSN 1010-6030

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Abstract

In this study, the treatment efficiency of different AOPs (UV/O3, UV/TiO2 and UV/TiO2/O3) was compared for the reduction of color and trace organics remained in the actual-treated wastewater using a laboratory scale recirculating ozonation photocatalytic system. Color, A254 (the organics absorption at the wavelength of 254 nm), and total organic carbon (TOC) were characterized to assess the process efficiency. The effects of ozone dose, circulation flow rate, UV intensity, ozone input flow rate, ozonation procedure, as well as UV light source on the process efficiency were also investigated. The results showed that the combined ozonation and photocatalytic process (UV/TiO2/O3) is more efficient than ozonation (UV/O3) or photocatalysis (UV/TiO2) alone, particularly in total mineralization of TOCs. It was evident that a synergistic effect occurred in the combined ozonation and photocatalytic process. The ozone dose and ozonation procedure were found to have a significant impact on the process efficiency whereas circulation flow rate, UV intensity, ozone input flow rate, and UV light source had relatively less effect. The color removal rate was significantly increased with the increase of O3 dose. The co-treatment of ozonation and photocatalytic oxidation increased TOC removal rate by nearly 50% compared to the process when ozonation was used as a pre-treatment for photocatalysis. This was due to the synergistic effect between photocatalysis and ozonation.

Item Type: Article
Uncontrolled Keywords: ResPubID15027. synergistic effect, ozonation, photocatalysis, colour removal, reused water, water treatment, wastewater, UV, ultra-violet light
Subjects: FOR Classification > 0399 Other Chemical Sciences
Faculty/School/Research Centre/Department > Institute for Sustainability and Innovation (ISI)
FOR Classification > 0904 Chemical Engineering
SEO Classification > 9004 Water and Waste Services
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Depositing User: VUIR
Date Deposited: 17 Aug 2011 00:09
Last Modified: 17 Aug 2011 00:09
URI: http://vuir.vu.edu.au/id/eprint/4101
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Citations in Scopus: 29 - View on Scopus

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