3.8 Article

Ultrasound assisted electrochemical oxidation of synthetic dye wastewater

Journal

INDIAN CHEMICAL ENGINEER
Volume -, Issue -, Pages -

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/00194506.2023.2280637

Keywords

Synthetic wastewater; decolorisation; electrooxidation; ultrasound

Ask authors/readers for more resources

This study investigated the treatment of synthetic dye wastewater using a sono-electrochemical reactor. The results showed that the addition of NaCl as a supporting electrolyte resulted in higher decolorization. Increasing the applied current density and decreasing the pH also improved the color removal. The sono-electrochemical process demonstrated better decolorization and COD reduction compared to the electrochemical process. The combined treatment under optimum conditions showed promising results in degrading recalcitrant compounds in wastewater.
This study reports the treatment of synthetic dye wastewater in a sono-electrochemical reactor. The influence of three different supporting electrolytes (Na2SO4, NaCl, and Na2NO3) on % decolorisation was studied and higher decolorisation was observed with NaCl. The increase in applied current density (0.25, 0.5, 0.75, 1, 1.25 A/dm(2)) enhanced the color removal and the optimum current density arrived was 1.25 A/dm(2). The % decolorisation was studied at three different pH (3, 7 & 11), and about 95.7% decolorisation was observed at pH 3. The inter electrode distance of 1 cm gave highest decolorisation. The addition of Na2SO4 and Na2NO3 in the sonolyzer bath did not influence the % decolorisation significantly. The sono-electrochemical process gave 99.16% decolorisation and 91.15% COD reduction while the electrochemical process gave 94.79% decolorisation and 76.82% COD reduction. The optimum electrolyte concentration, current density, pH and electrode distance of 0.5 g/L, 1.25 A/dm(2), 3, and 1 cm, respectively gave highest decolorisation. The reaction kinetics of the sono-electrochemical oxidation treatment was also investigated. The higher mineralisation rate at a lower residence time indicates that the combined treatment is promising for degrading recalcitrant compounds present in wastewater.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

3.8
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available