Decolorization and mineralization of Diarylide Yellow 12 (PY12) by photo-Fenton process: the Response Surface Methodology as the optimization tool.



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The Response Surface Methodology (RSM) was applied as a tool for the optimization of the operational conditions of the photo-degradation of highly concentrated PY12 wastewater, resulting from a textile industry located in the suburbs of Medellin (Colombia). The Box-Behnken experimental Design (BBD) was chosen for the purpose of response optimization. The photo-Fenton process was carried out in a laboratory-scale batch photo-reactor. A multifactorial experimental design was proposed, including the following variables: the initial dyestuff concentration, the H(2)O(2) and the Fe(+2) concentrations, as well as the UV wavelength radiation. The photo-Fenton process performed at the optimized conditions resulted in ca. 100% of dyestuff decolorization, 92% of COD and 82% of TOC degradation. A kinetic study was accomplished, including the identification of some intermediate compounds generated during the oxidation process. The water biodegradability reached a final DBO(5)/DQO = 0.86 value.


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Box-Behnken experimental design, Colombia, Diarylide, Intermediate compound, Kinetic study, Laboratory scale, Operational conditions, Optimization tools, Optimized conditions, Oxidation process, Photo-Fenton process, Response surface methodology, Statistical optimization, Textile wastewater, UV wavelength, Biodegradation, Degradation, Statistics, Surface properties, Textile finishing, Textile industry, Textile processing, Wavemeters, Optimization, coloring agent, diarylide yellow 12, ferrous ion, hydrogen peroxide, industrial chemical, unclassified drug, biodegradation, bioreactor, chemical oxygen demand, experimental design, mineralization, optimization, photodegradation, photooxidation, textile industry, total organic carbon, wastewater, wavelength, article, batch reactor, biodegradability, concentration (parameters), decolorization, dyestuff concentration, experimental design, kinetics, mineralization, oxidation, photo Fenton process, photodegradation, response surface method, ultra