Affiliation:
1. Civil Engineering Department Kharazmi University Tehran Iran
2. Aqua Intelligent Technology Vancouver British Columbia Canada
Abstract
AbstractThe textile and dyeing industries are among the largest water‐consuming and polluting industries in the world. The most important feature of the textile dyeing industry wastewater is its color, due to the use of colored materials. Most of these dye compounds are resistant to conventional purification methods and their biodegradation is very low through secondary purification processes, resulting in incomplete removal. Therefore, selecting the optimal method to remove these color compounds is essential. In this study, we studied the removal of an organic dye contaminant (Reactive Blue dye 19 [RB19]) using advanced oxidation processes (AOPs). For this purpose, ultraviolet (UV) mercury lamps with a wavelength of 254 nm and a voltage of W16 inside a reactor were used as an energy source. The experiments were performed in a collimated beam reactor inside a dark chamber. Two oxidizers, sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2), were used to remove RB19 from the artificial sewage stream. Removal of RB19 with a concentration of 20 mg/L with variable pH (5, 7, and 9), oxidant concentrations (5, 10, and 20 mg/L), and time (5, 10, 15, and 30 min) were investigated during the processes of photolysis, chemical oxidation (by H2O2 and NaOCl), and UV/NaOCl and UV/H2O2 AOPs. The photolysis process did not remove the RB19. The highest removal efficiencies of RB19 by chemical oxidation processes with NaOCl and H2O2, UV/NaOCl, and UV/H2O2 at optimal conditions (pH = 5, [oxidant] = 20 mg/L, RB19 = 20 mg/L, and radiation intensity of 1005 mJ/cm2) were 64.49%, 0.88%, 99.7%, and 13.31%, respectively. These results indicate that the hydroxyl radical was produced, under optimum conditions, more in the acidic medium; thus, the RB19 removal efficiency was higher in the acidic medium. The combination of UV rays with oxidants resulted in the production of more hydroxyl radicals and increased removal efficiency.
Subject
Pollution,Waste Management and Disposal,Environmental Engineering
Reference43 articles.
1. Application of response surface methodology in the degradation of Reactive Blue 19 using H2O2/MgO nanoparticles advanced oxidation process
2. Degradation product distribution of Reactive Red-147 dye treated by UV/H2O2/TiO2 advanced oxidation process
3. Bezi K. &Javadi M.(2010).The water crisis in the Middle East (challenges and solutions). Fourth International Congress of Geographers of the Islamic World University of Zabol.
4. Bodaghi S.(2013).Investigation of the presence of emerging pollutants in water resources and the role of the new WSP approach in water quality management. The First National Conference on Environmental Protection and Planning Islamic Azad University of Hamedan Ham‐Andishane Mohite Ziste Farda Hamedan.
5. A solar-driven UV/Chlorine advanced oxidation process
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