Novel trends in AOPs for textile wastewater treatment. Enhanced dye by-products removal by catalytic and synergistic actions

Abstract

The textile industry causes massive water pollution. As far as the color of textile wastewater is the most visible source of this pollution, it is the most studied. However, could the color of textile wastewater be only the top of the issue? Could the problem be recognized as an iceberg effect? Why is color removal not comparable to mineralization? This review paper tries to summarize the recent experience in the field of enhanced textile wastewater treatment. The enhancement through catalytic action for dye removals and their by-products was widely discussed. The basis of catalytic effects was studied for ozone-, H2O2, electro-, photo- and plasma-based processes. The synergistic effects in hybrid AOPs were discussed. The authors’ ambition was to highlight the by-products accumulation problem and emphasize the need for more advanced textile wastewater treatment, hoping to avoid the occurrence of a new group of dye-sourced micropollutants in the environment.

Keywords

• Textile wastewater
• Dye by-products
• Hybrid AOPs
• Catalytic ozonation
• Electro-oxidation
• Plasma treatment