Abstract
This paper presents the results of a laboratory study on the effect of pH (2, 5, and 9) and gas-phase ozone concentration (1, 7, and 11 wt. %) on the decolorization efficiency via ozonation for seven common textile dyes. Higher gas-phase ozone concentrations resulted in higher decolorization rates due to more rapid ozone transfer. Higher gas-phase ozone concentration, however, was also observed to have a positive, neutral, or negative effect on ozone dose requirements for different dyes. In general, greater ozone utilization efficiency was achieved at lower pH levels where direct ozone reactions predominate. It was observed that because ozonation can cause significant resolubilization of precipitated dyes, complete removal of dye precipitate should be accomplished prior to polishing via ozonation. The results point to the need for laboratory and/or pilot testing for dye-laden waste streams to allow process optimization.
Recommended Citation
C. D. Adams and S. Gorg, "Effect of PH and Gas-phase Ozone Concentration on the Decolorization of Common Textile Dyes," Journal of Environmental Engineering, vol. 128, no. 3, pp. 293 - 298, American Society of Civil Engineers, Mar 2002.
The definitive version is available at https://doi.org/10.1061/(ASCE)0733-9372(2002)128:3(293)
Department(s)
Civil, Architectural and Environmental Engineering
Second Department
Chemistry
Keywords and Phrases
Dyes; Laboratory tests; Ozone; Wastewater
International Standard Serial Number (ISSN)
0733-9372
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Society of Civil Engineers, All rights reserved.
Publication Date
01 Mar 2002
Included in
Architectural Engineering Commons, Chemistry Commons, Civil and Environmental Engineering Commons
