Degradação do corante Remazol vermelho RB por H2O2/UV

Abstract

Many industrial activities, including the textile industry, use a large volume of water in the process and produce a huge amount of wastewater. Chemical oxidation, including the Advanced Oxidation Processes (AOP), is one of the alternative technologies for the treatment of dye containing effluents. AOP is based on the generation of highly oxidizing hydroxyl radicals (.OH) which can decompose quickly and non-selectively the compounds, leading to their partial or complete mineralization. The paper aimed to study UV/H2O2 AOP for the degradation of the dye Remazol Red RB 133%, and the evaluation of experimental conditions such as hydrogen peroxide concentration, pH and potency of UV lamp on the process kinetics. It was observed that at 240 minutes irradiation time, all color was removed by using a dosage of 1% H2O2 and the COD removal was 78.4%. The pH 3, 6 and 8 did not influence the color removal, however at pH 10 a difference was found. COD removals at pH 3, 6 and 8 were higher which suggest a dye mineralization increase with the pH. However, COD removal at pH 10 did not show the same trend. The potency of UV lamp plays a role in the process in which 210 W was the best potency for color and COD removal. Therefore, AOP UV/H2O2 seems to be an interesting option for the treatment of textile effluents.