Degradation and sludge production of textile dyes by Fenton and photo-Fenton processes (original) (raw)
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Facta universitatis - series: Physics, Chemistry and Technology, 2017
In this review article, we summarize the current knowledge about the applicability of advanced oxidation processes (AOPs) such as UV/H2O2, Fenton and photo-Fenton for removal of textile dyes from wastewater and the effect of operational parameters (initial dye concentration, initial H2O2 concentration, initial Fe2+ concentration and initial pH) on these processes. Numerous studies have reported the use of AOPs for degradation of textile dyes, and the results show that they are very effective. By comparing the results of the previous studies, it seems that the photo- Fenton process is more efficient than the Fenton and UV/H2O2 process.
Fenton and Photo-Fenton Oxidation for the Remediation of Textile Effluents: An Experimental Study
Wiely , 2019
The decolorization efficiency of Acid Orange 3 (AO3) was investigated using Fenton (Fe 2+ /H 2 O 2) and photo-Fenton (Fe 2+ /H 2 O 2 /UV) processes. The outcome of different parameters, i.e., effect of pH, contact time, Fe +2 concentration, H 2 O 2 dose, initial dye concentration, and temperature on the decolorization process, was investigated and maximum degradation (90%) was achieved at pH 3, 0.5 mM Fe +2 , 6 mM H 2 O 2 at 50°C with 50 mg/L initial dye concentration at constant shaking speed of 100 rpm in 30 min. The effect of photo-Fenton (Fe +2 / H 2 O 2 /UV) treatment was evaluated by irradiating the dye solution at 365 nm at 261, 243, 212, 176 and 96 counts/sec intensities and resultantly, the decoloriza-tion efficiency was reached up to 97% of AO3 dye. The dye degradation data were fitted to different kinetics models and Behnajady-Modirshahla-Ghanbery (BMG) model best explained the AO3 degradation experimental data. Results revealed that the Fenton oxidation process would be used for the treatment of textile effluent containing waste dyes.
Decolorization of textile wastewater by photo-Fenton oxidation technology
Chemosphere, 2000
This paper describes the use of photo-fenton process for color removal from textile wastewater stream. The wastewater sample to be treated was simulated by using colorless polyvinyl alcohol (PVA) and reactive dyestu of R94H. As a result, the hydroxyl radical (HOá) oxidation can eectively remove color, but the chemical oxygen demand (COD) was removed in a slight degree. The color removal is markedly related with the amount of HOá formed. The optimum pH for both the OHá formation and color removal occurs at pH 3±5. Up to 96% of color can be removed within 30 min under the studied conditions. Due to the photoreduction of ferric ion into ferrous ion, color resurgence was observed after 30 min. The ferrous dosage and UV power aect the color removal in a positive way, however, the marginal bene®t is less signi®cant in the higher range of both. PVA as the major background COD of a textile wastewater stream inhibits the color removal insigni®cantly as its concentration increases. Ó
2016
In this study Advanced oxidation process using Fenton reagents is considered for the application of textile dye-house wastewater treatment. A representative basic dye-house wastewater sample has been brought from K.K. Textile Factory and its characteristic is analyzed and the result shows that dye-house wastewaters, containing basic dyes, are hazardous to the environment since their COD & BOD values are higher than the free discharge limit values and also they are highly colored even at the lower dye concentration operation cases. After characterizing the wastewater, advanced oxidation of a Basic Blue 41 dyes using solar -Fenton treatment was investigated in batch experiments using Box–Behnken statistical experiment design and the response surface analysis. Dyestuff, H2O2 and Fe2+ concentrations were selected as independent variables in Box– Behnken design while color and COD removal were considered as the response functions. Color removal increased with increasing H2O2 and Fe2+ con...
Use of Fenton reagent as advanced oxidative process for removing textile dyes from aqueous solutions
Decolorization of aqueous solutions containing an azo dye (Reactive Yellow 84) was achieved by advanced oxidative process using Fenton reagent. The optimum amounts of Fenton reagent was 25 mg/L of Fe 2+ and 250 mg/L of H 2 O 2 for an initial Reactive Yellow 84 concentration at 60 mg/L. The initial Fe 2+ concentration in the Fenton reagent affected the degradation efficiency, rate and kinetics. The ratio of Fe 2+ /H 2 O 2 is found equal to 0.1 to give the best result for the decolorization efficiency. The Fenton process was effective under pH 3 and the decolorization efficiency of Reactive Yellow 84 attained 85% for 20 min reaction time. Kinetics decolorization of RY84 followed pseudo second-order reaction. The reaction characteristic of oxidative reaction for decolorization efficiency process was evaluated as thermodynamically spontaneous under natural conditions. The value of activation energy is determined and is equal to 16.78 kJ/mol, this low value may show that the oxidative re...
Chemical Industry, 2015
The effectivness of UV/H2O2 process, Fenton and photo-Fenton process at decolorization of commercially important textile dyes Reactive Orange 4 (RO4) and Reactive Blue 19 (RB19) was evaluated. The effect of operational condition such as initial pH, initial H2O2 concentration, initial Fe2+ concentration and initial dye concentration on decolorization of RO4 and RB19 was studied. The photo-Fenton process is found to be more efficient than UV/H2O2 and Fenton process for decolorization of simulated dye bath effluent and solutions of the dyes in water alone under optimum conditions. In simulated dye bath the removal efficiency was slightly lower than for the solutions of the dyes in water alone for both dyes types. The results revealed that the tested advanced oxidation processes were very effective for decolorization of RO4 and RB19 in aqueous solution.
The process of degradation of a commercial organic dye DRIMARZEN BLACK-PS SG, obtained from a dying industry in Tamil Nadu in India was studied using various Advanced Oxidation Processes (AOPs) such as H2O2 + UV-C, Fenton, Fenton + UV-A and Fenton + UV-C. Effects of various parameters like dosage of Ferrous Sulphate(II), concentration of H2O2 and pH were studied. On increasing the Fe(II) dosage, the degradation efficiencies of Fenton process, Fenton + UV-A process (using UV light of 356nm wavelength) and Fenton + UV-C process (using UV light of 254nm wavelength) increase linearly and a minor decrease was observed in degradation efficiency after a limiting value. Fe(II) dosage was found to be optimum at 15mg/l, 20mg/l and 30mg/l for Fenton, Fenton + UV-A and Fenton + UV-C processes respectively. Concentration of H2O2 showed an optimum value of 10mM and pH showed an optimum value of 3.5 for all the processes. The dye degradation efficiencies were found to be 33%, 41%, 46% and 63% for H2O2 + UV-C, Fenton, Fenton + UV-A and Fenton + UV-C processes respectively.
Enhancing the Fenton Process by Uv Light Applied in Textile Wastewater Treatment
Environmental Engineering and Management Journal
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 Fe 3+ 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 Fe 3+ , 100 ppm H 2 O 2 and pH of 4.5.