Treatment of Textile Wastewater Using Advanced Oxidation Processes—A Critical Review

Textile manufacturing is a multi-stage operation process that produces significant amounts of highly toxic wastewater. Given the size of the global textile market and its environmental impact, the development of effective, economical, and easy-to handle alternative treatment technologies for textile...
Ausführliche Beschreibung

Textile manufacturing is a multi-stage operation process that produces significant amounts of highly toxic wastewater. Given the size of the global textile market and its environmental impact, the development of effective, economical, and easy-to handle alternative treatment technologies for textile wastewater is of significant interest. Based on the analysis of peer-reviewed publications over the last two decades, this paper provides a comprehensive review of advanced oxidation processes (AOPs) on textile wastewater treatment, including their performances, mechanisms, advantages, disadvantages, influencing factors, and electrical energy per order (E<sub<EO</sub<) requirements. Fenton-based AOPs show the lowest median E<sub<EO</sub< value of 0.98 kWh m<sup<−3</sup< order<sup<−1</sup<, followed by photochemical (3.20 kWh m<sup<−3</sup< order<sup<−1</sup<), ozonation (3.34 kWh m<sup<−3</sup< order<sup<−1</sup<), electrochemical (29.5 kWh m<sup<−3</sup< order<sup<−1</sup<), photocatalysis (91 kWh m<sup<−3</sup< order<sup<−1</sup<), and ultrasound (971.45 kWh m<sup<−3</sup< order<sup<−1</sup<). The Fenton process can treat textile effluent at the lowest possible cost due to the minimal energy input and low reagent cost, while Ultrasound-based AOPs show the lowest electrical efficiency due to the high energy consumption. Further, to explore the applicability of these methods, available results from a full-scale implementation of the enhanced Fenton technology at a textile mill wastewater treatment plant (WWTP) are discussed. The WWTP operates at an estimated cost of CNY ¥1.62 m<sup<−3</sup< (USD $0.23 m<sup<−3</sup<) with effluent meeting the China Grade I-A pollutant discharge standard for municipal WWTPs, indicating that the enhanced Fenton technology is efficient and cost-effective in industrial treatment for textile effluent. Ausführliche Beschreibung