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The synergistic effect of ozonation and photocatalysis on color removal from reused water

Paper ID Volume ID Publish Year Pages File Format Full-Text
28711 44087 2008 9 PDF Available
Title
The synergistic effect of ozonation and photocatalysis on color removal from reused water
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.

Keywords
Color removal; Water reuse; Photocatalysis; Ozonation; Titanium dioxide; Synergistic effect
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 196, Issue 1, 30 April 2008, Pages 24–32
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us