Synthetic dyes are widely used in the textile industry. It is estimated that about 2-50 % of these dyes are lost during the dying process and released in the effluents. These compounds are highly colored and can cause severe contamination of water sources. In this study, ferrate has been employed for the treatment of indigo blue aqueous solutions and denim wastewater. The electrosynthesis of ferrate was carried out using a 2 4 factorial design and the optimal conditions were found: current density of 100 mA/cm 2 , room temperature, kind and concentration of electrolyte, NaOH 20 M. Under these conditions, 6.89 g/L (41.54 mM) of ferrate was produced. The successful synthesis of ferrate was confirmed using infrared spectroscopy, ultraviolet spectroscopy, and cyclic voltammetry. The electrosynthesized sodium ferrate (Na2FeO4) and potassium ferrate (K2FeO4) were evaluated in a jar test. The maximum dye removal percentage (> 77 %) was achieved using Na2FeO4 at a dose of 300 mg/L. In denim wastewater, the best color removal efficiency was 92.51 % using 200 mg/L of K2FeO4 at 30 min. The increased biodegradability index (0.98) after treatment by K2FeO4 confirmed that the biorefractory compounds were oxidized/removed. Palabras clave: tratamiento de aguas residuales, coagulación-floculación, efluente textil, índice de biodegradabilidad RESUMEN Los colorantes sintéticos son ampliamente utilizados en la industria textil, se estima que aproximadamente del 2 al 50 % de estos son perdidos durante el proceso de teñido y conducidos hacia los efluentes en donde han ocasionado una contaminación severa. Por lo tanto, en este estudio, se utilizó ferrato para tratar soluciones acuosas de azul índigo y agua residual textil. La electrosíntesis de ferrato se realizó mediante
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