Reuse of Decolorized Dyeing Effluents in Repeated Dyeings

Öner E. , Atak O. , Gömeç R.

International Scientific Conference "Innovative solutions for sustainable development of textiles and leather industry", Oradea, Romania, 27 - 28 May 2016, vol.17, pp.105-110

  • Publication Type: Conference Paper / Full Text
  • Volume: 17
  • City: Oradea
  • Country: Romania
  • Page Numbers: pp.105-110


Abstract: In this experimental work, the effluents of the reactive and disperse dyeings were reused in the next

dyeing after the decolourization by ozone gas. Accordingly, the polyester woven samples were dyed with C.I.

Disperse Yellow 160, C.I. Disperse Red 77 and C.I. Disperse Blue 79:1, and the cotton woven samples were

dyed with C.I. Reactive Yellow 176, C.I. Reactive Red 239 and C.I. Reactive Blue 221. The effluents of the

dyeings with these dyes and also with their mixtures were decolorized by ozone gas. The colours of the

samples dyed with the decolorized effluents were compared with the original dyeings (standards) and the

colour differences were calculated. Under the experimental conditions of this investigation, the many of the

dyeing effluents were decolorized successfully, except the effluent of C.I. Disperse Red 77. In the case that this

red disperse dye present in the dyebath, the decolorized effluent had a slight reddish colour. The colour

differences between the original dyeing (standard) and the samples dyed with the decolorized effluent are

mostly below the tolerance (DE<1) or slightly above the tolerance. The solid colours and uniform dyeings

were achieved in the dyeings. The method seems promising in decreasing the amount of water used in textile


Key words: ozone treatment, reuse of dyebaths, decolourization, disperse dyes, reactive dyes