Evaluating the efficiency of advanced oxidation processes for textile wastewater treatment: Electro‐kinetic, sonochemical and persulfate

Abstract

The aim of this study was to evaluate the electro‐kinetic/ultrasonic/persulfate (EK/US/PS) process efficiency for textile wastewater treatment. The concentration of persulfate (0.5, 0.75, 1, 1.25, 1.5 mM), reaction time (30, 60, 90 and 120 min were studied consecutively, according to one factor at the time methodology. Result was indicated that the highest removal efficiency of 38% was achieved at pH 5. The chemical oxygen demand (COD) removal efficiency at electrolyte concentration of 6, 8 and 10 g/L were 56, 58 and 59% respectively. Results were showed that by increasing the ultrasonic power up to 300 W, the removal efficiency increased from 78 to 96% at a reaction time of 90 min and from 92 to 96% at a reaction time of 120 min. The correlation coefficient for pseudo‐first‐order kinetic model and pseudo‐second‐order kinetic models were obtained 0.96 and 0.87, respectively. Therefore, according to the results of this study, it was suggested to use EK/US/PS process for treatment of textile wastewater.

Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

“…Jorfi and Ghaedrahmat [ 43 ] also evaluated the electro/US/PDS process efficiency in the treatment of a textile wastewater. Parameters such as pH, electrolyte (Na 2 SO 4 ) concentration, applied voltage, PDS concentration, and US power were studied, and the optimal conditions determined.…”

“…Among the different studies involving the application of electro-persulfate processes in the treatment of complex wastewater matrices, there are a few that combined the electrochemical PS activation with irradiation or heat as co-activators [13,20,22,23,26,[41][42][43]. Table 5 summarizes the conditions used in the electro-persulfate studies involving coactivation by irradiation or heat, as well as the main results obtained.…”

“…Electro-persulfate processes involving co-activation by ultrasound radiation were applied in the treatment of petrochemical [22,41] and textile [42,43] wastewaters. Ahmadi et al [41] assessed the influence of different variables, such as pH, applied voltage, and US power, in a US-assisted electro-Fenton process for the treatment of saline petrochemical wastewater.…”