期刊名称：Revista Internacional de Contaminación Ambiental
印刷版ISSN：0188-4999
出版年度：2020
卷号：36
期号：3
页码：607-622
出版社：Centro de Ciencias de la Atmósfera
摘要：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 (Na 2 FeO 4 )and potassium ferrate (K 2 FeO 4 ) were evaluated in a jar test. The maximum dye removal percentage (> 77 %) was achieved using Na 2 FeO 4 at a dose of 300 mg/L. In denim wastewater, the best color removal efficiency was 92.51 % using 200 mg/L of K 2 FeO 4 at 30 min. The increased biodegradability index (0.98) after treatment by K 2 FeO 4 confirmed that the biorefractory compounds were oxidized/removed.
关键词：wastewater treatment;coagulation;flocculation;oxidation;textile effluent;biodegradability index;wastewater treatment;coagulation;flocculation;oxidation;textile effluent;biodegradability index
