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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.
Highlights
Textile dyeing is one of the most contaminative processes in textile wet processing [1]
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
relative unevenness index (RUI) of fabrics treated with water was the smallest, corresponding to around 0.2 for all the three fabrics dyed with different colors, demonstrating that all the three dyes had excellent leveling property
Summary
Textile dyeing is one of the most contaminative processes in textile wet processing [1]. The demand for sustainable manufacturing methods for textile products to save water and reduce wastewater generation is urgent [11] With this in mind, some feasible processes have been developed for effluent reclamation for reuse, including adsorption [12], electro-coagulation [13], ozonation [14], and some other comprehensive technologies [8,15]. All original organics in effluents contributing to pollution only changed their accumulation/dispersion status, and there is no reduction in mass Notwithstanding the fact they drastically improve the cleaning capacity of rinsing baths and potentially decrease water consumption, these benefits are accompanied with deficient water quality of the rinsing effluents. The collected spent effluents were treated by ozonation treatment to eliminate color contaminants before being reused in the second rinsing step (R2). The results of the study may broaden applications of ozonation technology in textile wastewater control
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