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- Title
Renovation of Dyebath Water by Chlorination or Ozonation.
- Authors
Perkins, Warren S.; Judkins Jr., Joseph F.; Perry, William D.
- Abstract
Direct, reactive, acid and disperse dyes decolorized when chlorine or ozone was injected into a solution of the dye. The reactive and acid dyes reacted very readily, and solutions of the dyes were decolorized almost completely by chlorine or ozone. The direct and disperse dyes reacted much more slowly than the acid and reactive dyes and formed persistent yellow chlorination products. Even large doses of chlorine did not completely decolorize the direct and disperse dyes. The direct dyes were decolorized to a greater degree with ozone than with chlorine. The disperse dyes were also eventually decolorized to a greater degree with ozone than with chlorine, but the reaction rate with ozone was slower. The decolorization rate with chlorine increased when the pH of the water containing the dye was lowered. All of the dyes studied decolorize relatively rapidly at pH 3.5. At pH 3.5 about 15 minutes is sufficient for the reaction of chlorine with the dye to proceed almost as far as it will ultimately proceed. Changes in pH had little or no effect on decolorization of dyes with ozone. Various substances may interfere with the chlorination or ozonation process. Both sodium nitrite and enzyme-degraded starch interfere with the decolorization of dyes with chlorine. Chlorine and ozone decrease the molecular weight of dye molecules by attacking amide and other linkages. Azo groups are attacked by ozone and chlorine. Alkyl residues such as methyl groups are also oxidated by ozone and chlorine.
- Subjects
DYES &; dyeing; CHLORINE; OXIDATION; OZONE; REACTIVE dyes; WASTEWATER treatment; CHLORINATION; OZONIZATION; COLOR in the textile industries
- Publication
Textile Chemist & Colorist, 1980, Vol 12, Issue 8, p27
- ISSN
0040-490X
- Publication type
Article