Optimization of triple dye mixture removal by oxidation with Fenton
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ORIGINAL PAPER
Optimization of triple dye mixture removal by oxidation with Fenton E. Adar1 Received: 30 December 2019 / Revised: 2 May 2020 / Accepted: 22 May 2020 © Islamic Azad University (IAU) 2020
Abstract Azo dyes are widely used in textile industry due to their easy production, high stability during washing and variety of colors. It raises concern over the ecosystem because of its structural features. Some advanced oxidation process that is tertiary treatment is one of the conventional treatment methods. Pollutants that cannot be removed by primary and secondary treatment are treated by tertiary treatment methods. Primary and secondary treatment methods are not generally sufficient for removal of azo dyes. For this reason, it has an important place in its treatment with advanced oxidation processes. The aim of this study is to investigate the effect of different parameters on color and COD removal yields of triple dye mixtures by Fenton method and to optimize with the Taguchi method. Moreover, the aim is to examine the relationship between these parameters and ORP by regression analysis, and the change of organic groups by FTIR analysis in the effluent. As a result of the study, it was observed that the parameters considered had different effects on COD and color removal. There was an increase in both color and COD removal only with the increase in H 2O2 concentration. The highest COD and color removal yields were 95.8% and 99.3%, respectively. As a conclusion, Fenton process is a method that can be preferred in the treatment of textile dyestuffs since the chemicals used are non-toxic, abundant and economical, and therefore, the operation cost of the system is quite favorable, providing advantages to compete with other advanced oxidation processes. Keywords FTIR · ORP · Observation · COD · Color · Treatment · Taguchi · Synthetic wastewater
Introduction As a result of the continuous development in ready-made clothing and home textiles, there are excessive production and consumption. The textile sector has an important place for production and environmental pollution, and there are pollutants in wastewater such as dyestuffs, surface active agents, toxic and organic compounds, heavy metals, soap, detergent, salt in bleaching, dyeing and washing processes in textile sector. Therefore, it is the most polluted wastewater for parameters such as different pH, dyestuff/color, temperature and organic, in other words, chemical oxygen demand (COD). It was stated that 1.6 million m 3 water was used in a textile factory for an average production of 8 tons. It is estimated that 7 × 105–10 × 105 tons of dyestuff Editorial responsibility: M. Abbaspour. * E. Adar [email protected] 1
Department of Environmental Engineering, Faculty of Engineering, Artvin Coruh University, 08100 Seyitler Campus, Artvin, Turkey
is produced for use in the textile industry worldwide and 2.8 × 105 tons of textile wastewater is produced annually (Mahamallik and Pal 2017; Turkes 2019), and 280,000 tons of the dye (10–15%) is discharg
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