Effect of temperature on the ozonation of textile waste effluent

Ramasamy, Rajakrishnan; Rahman, Noorsaadah Abd.; San, Wong Chiow

doi:10.1111/j.1478-4408.2001.tb00341.x

Cited by 17 publications

(7 citation statements)

References 11 publications

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Section: Resultssupporting

confidence: 92%

“…The decolorisation of the reactive dyebath by ozonation ranged from 85% to 100% for light shades, 89% to 100% for medium shades and 83% to 100% for dark shades (Figure 2). These results are in line with the decolorisation efficiency of 71-100% [22,[39][40][41] as reported. The average ozone consumption was 1371, 1752 and 2189 mg/l of the dyebath for light, medium and dark shades, respectively.…”

Section: Ozonation For Decolorisationsupporting

confidence: 91%

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Nanofiltration and ozonation for decolorisation and salt recovery from reactive dyebath

Vishnu

Joseph

2007

Coloration Technology

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Three commercially available high exhaust dyes were used to prepare dyebaths of different shades and subjected to nanofiltration and ozonation. Colour removal, chemical oxygen demand reduction, permeate flux, ozone consumption and total organic carbon removal were analysed to determine the efficiency of nanofiltration and ozonation. It was found that both nanofiltration and ozonation showed a high degree of (>90%) decolorising efficiency. High total organic carbon removal (80%) could be achieved by nanofiltration while ozonation could achieve only a maximum of 55% total organic carbon removal. The treated dyebath was reused for dyeing the fabric and the fabric quality was compared for the different shades. It was found that the quality of the dyed fabric was good for all shades dyed with nanofiltration permeate. The quality of the dyed fabric was affected for dark shades dyed with the ozone decolorised dyebath.

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Section: Resultssupporting

confidence: 92%

Section: Ozonation For Decolorisationsupporting

confidence: 91%

Nanofiltration and ozonation for decolorisation and salt recovery from reactive dyebath

Vishnu

Joseph

2007

Coloration Technology

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“…These results are in line with the decolorisation efficiency of 95% (Balcioglu and Arslan, 2001), 71 % (Ramasamy et al, 2001) and 90 % at 5 min ozonation time (Assalin, et al, 2004) at ozone dose of 15 and 14g/L respectively. Complete color removal of dye bath at 60 min ozonation time has also been reported (Balcioglu and Arslan, 2001; at an ozone dose of 35 mg/L.…”

Section: Discussionsupporting

confidence: 86%

Decolorisation of exhausted reactive dye bath using ozonator for reuse

Muthusubramanian

Vishnu

Joseph

2007

Int. J. Environ. Sci. Technol.

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Exhausted Reactive dye bath samples of Turquoise Blue, Olive Green and Navy Blue shades were collected from cotton knit wear dyeing units in Tirupur. Ozonation was conducted in a column reactor system fed with ozone at the rate of 0.16 g/min to assess its efficiency in reducing the color, chemical oxygen demand and total organic carbon. Complete decolorization of the effluent was achieved in 10 min contact time and ozone consumption of 153 mg/ L for Turquoise Blue, 128 for Olive Green and 143 for Navy Blue shades effluents respectively. The corresponding COD removal was 43 %, 44 % and 43 % for the three shades while TOC removal efficiency was 45 %, 45 % and 40% respectively. The results from the reusability studies indicate that the dyeing quality was not affected by the reuse of decolorized dye bath for two successive cycles. It is concluded that ozonation is efficient in decolorization of exhausted dye bath effluents containing conventional reactive dyes. However, the corresponding removal of COD from the textile effluent was not significant.

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“…19,[22][23][24][25] In case of vat dyes, the ozonation of textile wastewater has been studied with indigo carmine as the model pollutant 21 and actual textile effluent from a Malaysian plant using vat dyes. 17 The studies agreed that the dyes were degraded mainly by the direct action of ozone. The direct reaction favors the cleavage of the carbon-carbon double bond of the indigo molecule, thus producing isatin.…”

Section: Introductionmentioning

confidence: 65%

“…Oxidation of dye molecules proceeded typically through the molecular action of ozone without a significant reduction in organic carbon. [16][17][18][19][20][21] This indicates that ozone cleaves the chromophore of the dye molecule but does not attack on the intermediates. On the other hand, in the advanced oxidation process, where the formation of radicals from ozone is catalyzed with H 2 O 2 and UV irradiation, the organic carbon was reduced together with the decolorization of the dyeing effluents.…”

Section: Introductionmentioning

confidence: 99%

Finishing of denim fabrics with ozone in water

Kamppuri¹,

Mahmood²

2019

JTEFT

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The wet processing of denim jeans is required to achieve comfortable touch and versatile appearance for the final product. The finishing of denim jeans with ozone offers ecological and economic advantages by decreasing rinsing times, water and energy consumption. Ozone, a selective oxidant with high reduction potential, has proven to decolorize textile effluents and it is especially capable of reacting with indigo. In this study, the effect of ozone on the color change of denim fabrics and on the backstaining of the pocket fabrics was studied. Seven different denim fabrics, dyed with the indigo and mixture of indigo and sulfur dyes, were desized and bio-stoned and thereafter treated with ozone in aqueous medium. The response of the color of the indigo dyed denim fabrics to ozone was stronger in comparison with the fabrics dyed with the mixture of indigo and sulfur dyes. The pocket fabrics backstained during the desizing and bio-stoning and subsequent ozone treatment was able to decrease the backstaining. Ozone was able to bleach the denim jeans and decreased the backstaining without the significant loss of the strength of the fabrics. The combined desizing and enzyme wash followed by the ozone wash is thus a promising finishing treatment for denim jeans.

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Effect of temperature on the ozonation of textile waste effluent

Cited by 17 publications

References 11 publications

Nanofiltration and ozonation for decolorisation and salt recovery from reactive dyebath

Nanofiltration and ozonation for decolorisation and salt recovery from reactive dyebath

Decolorisation of exhausted reactive dye bath using ozonator for reuse

Finishing of denim fabrics with ozone in water

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