This study focused on the advanced oxidation of the hetero bi-functional reactive dye Sumifix Supra Yellow 3RF (CI Reactive Yellow 145) using dark Fenton and photo-Fenton conditions in a lab-scale experiment. A 2(3) factorial design was used to evaluate the effects of the three key factors: temperature, Fe(II) and H2O2 concentrations, for a dye concentration of 250 mg L-1 with chemical oxygen demand (COD) of 172 mg L-1 O-2 at pH = 3. The response function was the COD reduction. This methodology lets us find the effects and interactions of the studied variables and their roles in the efficiency of the treatment process. In the optimization, the correlation coefficients for the model (R-2) were 0.948 and 0.965 for Fenton and photo-Fenton treatments, respectively. Under optimized reaction conditions: pH = 3, temperature = 298 K, [H2O2] = 11.765 mM and [Fe(II)] = 1.075 mM; 60 min of treatment resulted in a 79% and 92.2% decrease in COD, for the dye taken as the model organic compound, after Fenton and photo-Fenton treatments, respectively
This study focused on the application of the Response Surface Methodology (RSM) to determine the effects of operational parameters on the dark Fenton oxidation of a barley straw effluent (BSE) in a lab-scale experiment, with a chemical oxygen demand (COD) of 749 mg·L-1 O2 at pH = 3. A central composite face-centered design (CCF) with 17 experiments was adopted for our study, since responses could be simply related to the chosen factor (COD, UV254 or UV280 removal) using linear or quadratic models. This methodology let us find the effects and interactions of the studied variables and their roles on the efficiency of treatment process. In the optimization, the correlation coefficients for the model (R2) were 0.996 for COD, 0.995 for UV254 and 0.994 for UV280. Optimized reaction conditions were established as pH = 3, T = 40 º C, [H2O2] = 1800 mg·L-1 and [Fe (II)] = 250 mg·L-1. Under these conditions; 120 minutes treatment resulted in a 81.6 % COD removal, an 89.1% UV254 removal and 93.0 % UV280 removal
Blanco, J.; Torrades, F.; Morón, M.; Brouta-Agnésa, M.; García-Montaño, J. Chemical engineering journal Vol. 240, p. 469-475 DOI: 10.1016/j.cej.2013.10.101 Data de publicació: 2014-03-15 Article en revista
Both photo-Fenton oxidation and the combination of aerobic sequencing batch reactor (SBR) + photo-Fenton processes were investigated in a bench-scale study to degrade and reuse a real textile wastewater with Total Organic Carbon (TOC) = 390 mg L-1, Chemical Oxygen Demand (COD) = 1560 mg L-1 O-2 and Escherichia coli = 80000 CFU mL(-1) in further dyeing processes. The independent variables considered for the evaluation of the oxidative process were temperature, H2O2 and Fe (II) concentrations. Required treated water qualities were determined by both RD 1620/2007 (Spanish Normative for wastewater reclamation and reuse) and specific water qualities for internal reuse. The best results were obtained when applying photo-Fenton process as a polishing step, where previous aerobic SBR under 1 day hydraulic retention time (HRT), gave 75% TOC reduction after 25 cycles. The further photo-Fenton process coupled under: ([Fe (II)] = 66.5 mg L-1; [H2O2] = 1518 mg L-1; T = 25 degrees C and pH = 2.7) conditions, achieved final COD and TOC reductions of 97 and 95% respectively. E. coil was fully removed according to specific normative. Finally, in order to accomplish specific water qualities for 100% internal reuse, resultant water was further conditioned by reverse osmosis and reused in bench-scale simulated dyeing processes, providing similar dyeing results in terms of K/S than those obtained by using fresh water.
This work focuses on the use of Fenton reagent and UV-irradiation, in a lab-scale experiment, for the treatment of real dye wastewater coming from a Spanish textile manufacturer. Response surface methodology and a 23 factorial design were used to evaluate the effects of the three independent variables considered for the optimization of the oxidative process: temperature, Fe (II) and H2O2 concentrations, for a textile wastewater generated during a dyeing process with chemical oxygen demand of 1705 mg L_1 O2 at pH ¼ 3.Wastewater degradation was followed in terms of chemical oxygen demand reduction. In the optimization, the correlation coefficients for the model (R2) were 0.985 and 0.990 for Fenton and photo-Fenton treatments respectively. Optimum reaction conditions at pH ¼ 3 and temperature ¼ 298 K were [H2O2] ¼ 73.5 mM and [Fe(II)] ¼ 1.79 mM. The combination of Fenton, Fenton-like and photon-Fenton reactions has been proved to be highly effective for the treatment of such a type of wastewaters, and several advantages for this technique arise from the study. Under optimum conditions, 120 min of treatment resulted in a 62.9% and 76.3% reduction in chemical oxygen demand after Fenton and photo-Fenton treatments respectively
Abellán, M.; Blanco, J.; de la Varga, M.; Torrades, F.; Galí, D.; Garcia-Montaño, J. European Meeting on Chemical Industry and Environment p. 839-840 Data de presentació: 2010-05-19 Presentació treball a congrés
Blanco, J.; Torrades, F.; Garcia-Montaño, J.; Navarro, M.; Galí, D.; de la Varga, M. European Meeting on Chemical Industry and Environment p. 889-890 Data de presentació: 2010-05-19 Presentació treball a congrés
Garcia-Montaño, J.; Surribas, A.; Alaman, M.; Blanco, J.; Torrades, F.; Blanco, M.; Martinez, A.; Marcaide, A. Revista de química e industria téxtil num. 196, p. 24-29 Data de publicació: 2010-03 Article en revista
Los Procesos Avanzados de Oxidación tipo Fenton, orientados a la mineralización de contaminantes orgánicos persistentes, y los métodos enzimáticos para la decoloración, suponen una alternativa viable para la depuración de efluentes textiles. Aplicados bajo condiciones óptimas de operación, ambos alcanzan niveles de descontaminación satisfactorios, pudiendo aplicarse como complemento de los procesos de depuración biológicos convencionales.
Blanco, J.; Abellán, M.; Galí, D.; de la Varga, M.; Garcia-Montaño, J.; Torrades, F. Innovative processes and practices for wastewater treatment and re-use in the Mediterranean region p. 121 Data de presentació: 2009-10 Presentació treball a congrés
Garcia-Montaño, J.; Torrades, F.; Pérez-Estrada, L.; Oller, I.; Malato, S.; Maldonado, M.; Peral, J. Environmental science and technology Vol. 42, num. 17, p. 6663-6670 DOI: 10.1021/es800536d Data de publicació: 2008-09 Article en revista
Reactive azo dye Procion Red H-E7B solutions have been submitted to solar-assisted photo-Fenton degradation. The solution color quickly disappears, indicating a fast degradation of the azo group. Nevertheless, complete DOC removal was not accomplished, in accordance with the presence of resistant triazine rings at the end of the reaction. The intermediates generated along the reaction time have been identified and quantified. LC-(ESI)-TOF-MS analysis allowed the detection of 18 aromatic compounds of different size and complexity. Some of them shared the same accurate mass, and consequently, the same empirical formula, but appeared at different chromatographic retention times, evidencing their different molecular structures. Heteroatom oxidation products like NH4+, NO3-, Cl-, and SO42- have also been quantified and explanations of their release are proposed. Short chain carboxylic acids are also detected at long reaction times, as a previous step to complete dye mineralization. A link between the disappearance of the largest intermediate products and the increase of the solutions biodegradability has been established. Finally, taking into account all the findings of the present study and previous related works, the evolution from the original dye to the final products (triazine and CO2) is proposed in a general reaction scheme.
García-Montaño, J.; Pérez-Estrada, L.; Oller, I.; Maldonado, M.; Torrades, F.; Peral, J. Journal of photochemistry and photobiology A. Chemistry Vol. 195, num. 2-3, p. 205-214 Data de publicació: 2008-04 Article en revista