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Two-stage hybrid electrocoagulation–adsorption in the removal of disperse dyes and inorganic salts from the textile dyeing effluent

The conventional physical, chemical and biological treatment methods are less efficient, more time and energy-intensive, need more operational space and are less efficient in treating effluent-containing toxic elements. In the past few decades, electrocoagulation is gaining more attention in the treatment of textile dyeing effluent to remove color and chemical oxygen demand, because of its environmental compatibility and versatile nature. As a tertiary treatment for the removal of salts, capacitive deionization (CDI) is another electrochemical method that is effective in the removal of salts. In this study, high-performance hybrid TiO2/Al and carbon aerogel electrodes-based electrocoagulation–adsorption technology have been applied to treat the dyeing wastewater from small-scale industries in batch as well as in continuous mode. The effect of operating parameters such as pH, initial concentration of dye, electrolyte concentration, current and reaction time on the decolorization removal efficiency has been investigated. From the experimental investigations, it was observed that 99% of dye was removed, when the initial concentration of dye was 90 mg/L at initial pH of 7.0, with DC power of 0.3 Å and the reaction time of 10 min. It was also noted that about 60% of chlorides in the electro coagulated treated wastewater was removed through CDI.