Enhancing the fenton process by uv light applied in textile wastewater treatment

Vasilica-Ancuta Simion1, Igor Cretescu1, Doina Lutic2, Constantin Luca3, Ioannis Poulios4

1 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 73 Prof. Dr. docent Dimitrie Mangeron Str., 700050 Iasi, Romania
2 Al. I. Cuza University, Department of Materials Chemistry, 11 Carol I Blvd., 700506 Iasi, Romania
3 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Organic, Biochemical and Food Engineering, 73 Prof. Dr. docent Dimitrie Mangeron Str., 700050 Iasi, Romania
4 Aristotle University of Thessaloniki, Department of Chemistry, 54124 Thessaloniki, Greece

Abstract


Nowadays, an efficient wastewater management involves the use of advanced treatment technologies able to decompose hardly biodegradable compounds with reasonable costs at the lowest possible environmental impact. In our work we used one of the most efficient advanced wastewater treatment, the Fenton reaction and its photo-assisted version. The hydrogen peroxide was the oxidizer; despite its relatively high cost, its high activity in oxidizing of a large variety of organic persistent pollutants in the presence of Fe3+ ions as catalyst, makes it an alternative which is worth to be considered even in practical medium scale systems. The Fenton and photo-Fenton oxidation were performed using a model dye, the xanthene-type Rhodamine 6G, widely used in a series of biotechnology applications, but having major drawbacks when released in natural water flows, mainly mutagen and carcinogen effects. Therefore, a parametric case study was performed in order to define the optimal operating parameters (the pH value, the hydrogen peroxide concentration and the iron catalyst concentration). The oxidative degradation of Rhodamine 6G by Fenton reaction was more effective when combined with UV irradiation. Each parameter of the oxidative treatment is essential for the color and TOC removal. The optimal values found for the total color degradation and mineralization of the dye were as follows: 16 ppm Fe3+, 100 ppm H2O2 and pH of 4.5.

Keywords


advanced wastewater treatment; advanced oxidation process; photo-Fenton; Rhodamine 6G; UV irradiation

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