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. 2019 Jul 29;24(15):2755.
doi: 10.3390/molecules24152755.

Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

Enling Hu  1   2 , Songmin Shang  3 , And Ka-Lok Chiu  2
Affiliations

Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

Enling Hu et al. Molecules. .

Abstract

The textile wash-off process consumes substantial amounts of water, which generates large volumes of wastewater that pose potential pollution issues for the environment. In the present study, catalytic ozonation was applied to degrade residual dyes present in rinsing effluents from wash-off processes towards the aim of recycling the waste effluents. A magnetic catalyst was prepared for promoting dye degradation by catalytic ozonation. Via a hydrothermal reaction, highly magnetic manganese ferrite (MnFe2O4) particles were successfully loaded on carbon aerogel (CA) materials (MnFe2O4@CA). The results showed that the developed catalyst strikingly promoted the degradation of dye contaminants by catalytic ozonation, in terms of color removal and reduction of chemical oxidation demand (COD) in rinsing effluents. COD removal efficiency in catalytic ozonation was enhanced by 25% when compared with that achieved by ozonation alone under the same treatment conditions. Moreover, we confirmed that after catalytic ozonation, the rinsing effluents could be recycled to replace fresh water without any evident compromise in the color quality of fabrics. The color difference (ΔEcmc(2:1)) between fabrics treated with recycled effluents and water was not more than 1.0, suggesting that the fabrics treated with recycled effluents displayed acceptable color reproducibility. Although colorfastness and color evenness of fabrics treated with recycled effluents were slightly poorer than those of fabrics treated with water, they were still within the acceptable tolerance. Therefore, the present study validated that catalytic ozonation was a promising technology for saving water and wastewater elimination in textile dyeing. It provides a feasibility assessment of catalytic ozonation for recycling waste effluents to reduce water dependence in textile production. Furthermore, we show a new perspective in on-site recycling waste effluents by catalytic ozonation and enrich the knowledge on feasible approaches for water management in textile production.

Keywords: catalytic ozonation; effluent recycling; fabric color quality; magnetic collection; textile dyeing.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Recycling of spent rinsing effluents by catalytic ozonation.
Figure 2
Figure 2
XRD pattern of CA and MnFe2O4@CA.
Figure 3
Figure 3
SEM images MnFe2O4 (a,b) and MnFe2O4@CA (c,d), and TEM (e) and SEAD (f) of MnFe2O4@CA.
Figure 4
Figure 4
Nitrogen adsorption-desorption isotherms of catalyst materials.
Figure 5
Figure 5
FTIR of MnFe2O4 and MnFe2O4@CA.
Figure 6
Figure 6
TGA of CA and MnFe2O4@CA.
Figure 7
Figure 7
Color of Er1 treated by various processes: digital photos (a) and UV-vis absorbance (b) of Er1 after different treatment time.
Figure 7
Figure 7
Color of Er1 treated by various processes: digital photos (a) and UV-vis absorbance (b) of Er1 after different treatment time.
Figure 8
Figure 8
Evolution of COD of Er1 in different processes.
Figure 9
Figure 9
Color evolution of selected effluents.
Figure 10
Figure 10
COD evolution of selected effluents.
Figure 11
Figure 11
Color difference of fabrics dyed with different dyes.
Figure 12
Figure 12
RUI of fabrics dyed with different dyes.
Figure 13
Figure 13
Flow chart of recycling waste rinsing effluents in wash-off process.
See this image and copyright information in PMC

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