Removal of Acid Yellow 17 from Textile Wastewater by Adsorption and Heterogeneous Persulfate Oxidation
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ORIGINAL PAPER
Removal of Acid Yellow 17 from Textile Wastewater by Adsorption and Heterogeneous Persulfate Oxidation E. Adar1 Received: 13 July 2020 / Revised: 27 September 2020 / Accepted: 10 October 2020 © Islamic Azad University (IAU) 2020
Abstract Azo dyes commonly used in various industries have a stable and toxic structure. Wastewater containing AY17 dye as a model contaminant was investigated in terms of color and COD removal by both adsorption and persulfate oxidation activated with the PAC. In this study, the effects of temperature (25–50 °C), pH (3–10), persulfate concentration (1000–4000 mg/L), adsorbent dosage (0.1–0.5 g), reaction time (5–60 min), dye concentration (300–1000 mg/L) and NaCI concentration (0–1000 mg/L) on both color and COD removals from wastewater containing AY17 dye were examined. As a result of the study, it was seen that the dosage of adsorbent, pH and reaction time are important parameters in both systems. The use of the PAC as an adsorbent caused to shortening of the reaction time in the HPS system. It also showed that acidic and neutral pH values are more suitable for the removal of AY17 with both systems. Color and COD removal were determined as 100–88.4% and 100–96.6%, respectively, at optimum values obtained for the adsorption and HPS system. An experimental design was applied for various operating parameters in order to analyze experimental data. Models have been proposed for both color removal and COD removal estimates for both systems. Keywords Heterogeneous persulfate oxidation · Adsorption · Powder activate carbon · Temperature · Salt · pH
Introduction The continuous and rapid development of the industry with the population growth in the world leads to many problems, especially environmental pollution. One of the specific contaminants that cause environmental pollution today is synthetic dyes. Dyestuffs are commonly used in various industries (detergent, soap, silk, etc.), especially in the textile industry, and even their low use generates colored wastewater (Imecik et al. 2014). Wastewater from the textile and dye production industries is among the wastewater group that is difficult to treat. The reason for this is that the dyes generally have a synthetic and complex aromatic molecular structure and these structures make the dyes more stable and more resistant to biodegradation. More than one hundred thousand Editorial responsibility: Maryam Shabani. * E. Adar [email protected] 1
Department of Environmental Engineering, Faculty of Engineering, Artvin Coruh University, Seyitler Campus, 08100 Artvin, Turkey
synthetic dye types are used commercially worldwide, and it is estimated that approximately 700,000 tons are produced annually. Azo dyes, which are characterized by nitrogennitrogen double bonds (N=N), constitute the largest and most important commercial dye class that constitutes 50% of all commercial dyes (Yang et al. 2011). It is reported that approximately 10–15% of these dyes are discharged with industrial wastewater. Even in low concentrations, they
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