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Decolorization of textile wastewater by electrooxidation process using different anode materials: Statistical

Nouha Bakaraki Turan¹, Hanife Sari Erkan¹, Fatih Ilhan¹

¹Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey.

Water Environment Research : a Research Publication of the Water Environment Federation

|January 19, 2022

Summary

This study evaluated different anode materials for removing reactive dyes from textile wastewater using electrooxidation. Titanium dioxide (TiO2)-coated ruthenium dioxide (RuO2) and TiO2/TiO2 anodes offered the highest color removal efficiency with the lowest energy consumption.

Keywords:

RuO2 electrode TiO2 electrode decolorization electrooxidation textile wastewater

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Area of Science:

Environmental Chemistry
Electrochemistry
Wastewater Treatment

Background:

Textile wastewater contains reactive dyes, posing environmental risks due to mutagenic and carcinogenic properties.
Effective decolorization methods are crucial for mitigating the environmental impact of textile industry effluents.

Purpose of the Study:

To investigate the efficacy of various anodic materials in the electrooxidative decolorization of real textile wastewater.
To optimize color removal and energy consumption using response surface methodology and Box-Behnken design.

Main Methods:

Electrooxidation process utilizing four different anode materials: Pt/TiO2, RuO2/TiO2, TiO2/TiO2, and graphite, with TiO2 as the cathode.
Response surface methodology (RSM) and Box-Behnken design (BBD) for optimization studies.
Analysis of variance (ANOVA) to determine the compatibility and performance of electrode pairs.

Main Results:

All tested anodic materials achieved satisfactory color removal efficiencies exceeding 86%.
RuO2/TiO2 anode exhibited the highest color removal efficiency (93.6%) with the lowest energy consumption (0.26 €/m³).
TiO2/TiO2 anode also demonstrated high efficiency (91.5%) and low energy consumption (0.31 €/m³).

Conclusions:

Anodic material selection significantly impacts the efficiency and cost-effectiveness of textile wastewater decolorization.
TiO2/TiO2 and RuO2/TiO2 electrode pairs are recommended for practical application due to their superior performance in both color removal and energy efficiency.
Electrooxidation presents a viable and efficient technology for treating reactive dye-containing textile wastewater.