Greener And Expedient Approach for the Wastewater Treatment by Fenton and Photo-Fenton Processes: A Review (original) (raw)
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A review on Fenton and improvements to the Fenton process for wastewater treatment
Journal of Environmental Chemical Engineering, 2014
The increase in the disposal of refractory organics demands for newer technologies for the complete mineralization of these wastewaters. Advanced oxidation processes (AOPs) constitute a promising technology for the treatment of such wastewaters and this study presents a general review on such processes developed to decolorize and/or degrade organic pollutants. Fundamentals and main applications of typical methods such as Fenton, electro-Fenton, photo-Fenton, sono-Fenton, sonophoto-Fenton, sono-electro-Fenton and photo-electro-Fenton are discussed. This review also highlights the application of nano-zero valent iron in treating refractory compounds.
Degradation of organic effluents containing wastewater by photo-Fenton oxidation process
RESEARCH STATEMENT TOPIC OF Ph.D THESIS : “USE OF PHOTOFENTONS REAGENT AS AN OXIDANT” YEAR OF SUBMITION : 2004 YEAR OF AWARD : 2006 PAPER PUBLICATION:02 (ONE NATIONAL AND ONE INTERNATIONAL LEVELIJC-A Vol.47A(11) [November 2008] Photooxidation of some organic pollutants (p-nitroaniline, p-aminophenols and acetanilide) has been carried out in the presence of photo-Fenton reagent. The effect of various parameters like pH, concentrations of organic compounds, ferric ions and hydrogen peroxide and light intensity, etc. on the reaction rate has been studied. The degradation is found to be pseudo first order. The optimum pHs for the degradation of p-aminophenol, p-nitroaniline and acetanilide are found to be 3.0, 3.5 and 2.5, respectively while the rate degradations of the three compounds are found to be comparable. The study shows that the photo-Fenton process are more effective and faster than Fenton's reagent in oxidation of organic compounds, and that the organic compounds are completely oxidized and degraded into CO2 and H2O. A tentative mechanism has been proposed. Excellent removal has been obtained using photo-Fenton process assisted with artificial irradiation. This study demonstrates that the use of photo-Fenton process on organic effluents wastewater treatment is very promising, especially when solar light is used.
Treatment of organic pollutants by homogeneous and heterogeneous Fenton reaction processes
Environmental Chemistry Letters, 2018
Nowadays, the water ecosystem is being polluted due to the rapid industrialization and massive use of antibiotics, fertilizers, cosmetics, paints, and other chemicals. Chemical oxidation is one of the most applied processes to degrade contaminants in water. However, chemicals are often unable to completely mineralize the pollutants. Enhanced pollutant degradation can be achieved by Fenton reaction and related processes. As a consequence, Fenton reactions have received great attention in the treatment of domestic and industrial wastewater effluents. Currently, homogeneous and heterogeneous Fenton processes are being investigated intensively and optimized for applications, either alone or in a combination of other processes. This review presents fundamental chemistry involved in various kinds of homogeneous Fenton reactions, which include classical Fenton, electro-Fenton, photo-Fenton, electro-Fenton, sono-electro-Fenton, and solar photoelectron-Fenton. In the homogeneous Fenton reaction process, the molar ratio of iron(II) and hydrogen peroxide, and the pH usually determine the effectiveness of removing target pollutants and subsequently their mineralization, monitored by a decrease in levels of total organic carbon or chemical oxygen demand. We present catalysts used in heterogeneous Fenton or Fenton-like reactions, such as H 2 O 2-Fe 3+ (solid)/nano-zero-valent iron/immobilized iron and electro-Fenton-pyrite. Surface properties of heterogeneous catalysts generally control the efficiency to degrade pollutants. Examples of Fenton reactions are demonstrated to degrade and mineralize a wide range of water pollutants in real industrial wastewaters, such as dyes and phenols. Removal of various antibiotics by homogeneous and heterogeneous Fenton reactions is exemplified.
Chemical Method For Wastewater Management : Developments Of Fenton Process
2017
Fenton process represents a promising technology for the treatment of recalcitrant wastewaters. In recent years, many studies have been conducted on the applications of Fenton process for the removal of organic pollutants in wastewater. This study presents Fenton and improvements of Fenton process such as photo-Fenton, electro-Fenton and sono-Fenton processes. Previous studies on catalysts and their efficiencies in Fenton and improvements of Fenton process were also analyzed. The effects of many important operational parameters such as pH, Fenton reagents, initial concentration of the pollutants, concentration of inorganic ions and energy input in Fenton process have been discussed and their roles are highlighted. It has been concluded that further investigations are needed to evaluate the cost of Fenton process, especially when it is combined with other energy input processes. Integration of Fenton process with other conventional methods as pre-treatment or post-treatment stage is ...
An overview of the application of Fenton oxidation to industrial wastewaters treatment
Journal of Chemical Technology & Biotechnology, 2008
This review provides updated information on the application of the Fenton process as an advanced oxidation method for the treatment of industrial wastewaters. This technology has been used in recent decades as a chemical oxidation process addressed to meet a variety of objectives including final polishing, reduction of high percentages of organic load in terms of chemical oxygen demand or total organic carbon and removal of recalcitrant and toxic pollutants thus allowing for further conventional biological treatment. The efficiency and flexibility of this technology has been proven with a wide diversity of effluents from chemical and other related industries or activities, including pharmaceutical, pulp and paper, textile, food, cork processing, and landfilling among others.
Abstract In these years, due to the increasing presence of molecules in industrial waste water from factories and petroleum refineries, the conventional biological methods cannot be used for complete treatment of the effluent therefore the need to newer technologies to degrade these refractory molecules into smaller molecules became very imperative. Advanced oxidation processes (AOPs) constitute a promising technology for the treatment of wastewaters. Fenton’s oxidation was one of the best known metal catalyzed oxidation reactions of water-miscible organic compounds. The mixture of FeSO4 or any other ferrous complex and H2O2 (Fenton’s reagent) at low enough pH, results in Fe2+ catalytic decomposition of H2O2 and proceeds via a free radical chain process that produces hydroxyl radicals which have extremely high oxidizing ability and could oxidize hard to decompose organic compounds in a short time. This work aims at highlighting Fenton’s oxidation processes operating at ambient conditions viz. photo-catalytic oxidation, Fenton’s chemistry and use of hydrogen peroxide. The pre-oxidation of an extremely polluted pharmaceutical wastewater, Direct Blue 71 (DB71) oil recovery industry wastewater, the fish canning industrial wastewater, Active pharmaceutical intermediates (API) in waste waters by Fenton’s oxidation process to degrade organic pollutants. The work highlights the basics of these individual processes including the reactor design aspects, the optimum parameters such as dosage of ferrous sulfate and hydrogen peroxide, pH and initial concentration of pollutants and a complete overview of the various applications to wastewater treatment by Fenton’s oxidation processes in the recent years. This study presents a general review on the effectiveness of Fenton’s technique for the treatment of semi-aerobic landfill leachate (Treatment with Fenton’s reagent appears to be an appropriate method for oxidizing recalcitrant
Batch and Continuous Photo-Fenton Oxidation of Reactive-Red Dye from Wastewater
This paper aims to investigate the ability of photo-Fenton technology to remove Reactive Red dye (RR-dye) from wastewater using batch and continuous operating modes. The batch mode of photo-Fenton removal of organic content was conducted under the influence of solution pH (3-10), hydrogen peroxide (25-100 ppm), irradiation time (20-90 min), ferrous sulphate (5-20 ppm), and temperature (25-60 °C). For comparison, the continuous treatment was conducted under the influence of the flow rate of the contaminated solution (10, 20, 30, 40, and 50 mL/min). The results revealed that the treatability of the batch mode was more effective compared to the continuous mode. In the batch process, the organic contaminant was completely removed compared to that of 82% obtained when the continuous system was performed. The optimization process showed that the optimal values of the operating variables in the case of the batch removal of RR-dye were 3, 78 ppm, 90 min, 20 ppm, and 60 °C for pH, hydrogen peroxide, irradiation time, ferrous sulphate, and temperature, respectively. Moreover, the reversion F-value was 21.69, the probability P value was less than 0.001, and the correlation coefficient was (R 2 = 0.9455), which illustrative the significance of the model obtained for the batch process.
Chemosphere, 1994
Results of the photochemical mineralization of 4-¢hlorophenol (4-CP) and of a wastewater ~om dyehouse industry by the methods UV/O3, UV/I-I202, UV/TiO2 and UV/I-~O~-~ 2÷ (photo-Fenton reaction) are reported and compared. Under illumination with a 150 W high pressure merettry lamp, TOC-degra~fion efficiency for 4-CP had the following order:. UV/I-I20~/Fe2÷ > UV/O3 > UV/I~O 2 = UV/TiO 2. Complete deeolotuq.z~on of the dye waste ooctnred within 20 minutes with ozone. A mineralization grade of approximately 75% was reached after 90 minutes with the photo-Fenton reaction and after 150 minutes with UV/ozone. The combinations UV/TiO 2 and UV/I-I~O 2 were found to be less efficient for bleaching and degradation of the dye waste. Furthermore, a novel combination for wastewater treatment, UV/Fe2÷/O3, was investigated. Addition of Fe 2÷ to the UV/ozone process increased the mineralization rate of 4-CP while no significant effect on dye waste degradation could be observed.
Fenton chemistry encompasses reactions of hydrogen peroxide in the presence of iron to generate highly reactive species such as the hydroxyl radical and possibly others. In this review, the complex mechanisms of Fenton and Fenton-like reactions and the important factors influencing these reactions, from both a fundamental and practical perspective, in applications to water and soil treatment, are discussed. The review covers modified versions including the photoassisted Fenton reaction, use of chelated iron, electro-Fenton reactions, and Fenton reactions using heterogeneous catalysts. Sections are devoted to nonclassical pathways, by-products, kinetics and process modeling, experimental design methodology, soil and aquifer treatment, use of Fenton in combination with other advanced oxidation processes or biodegradation, economic comparison with other advanced oxidation processes, and case studies.
IRJET- A REVIEW OF FENTON PROCESS FOR ORGANIC WASTEWATER TREATMENT
IRJET, 2021
Water pollution has become a serious matter worldwide. Due to the environment concern and requirement of pure water for increasing population high efficiency water treatment methods are needed. Advanced Oxidation Process (AOPs) are promising for wastewater treatment. Fenton process is type of AOP which has been studied widely. In this report basics of Fenton process are discussed, its reaction mechanism, pros & cons, it's application in different industries. Different optimization techniques to overcome limitation of Fenton process, their mechanism along with problems related with this techniques. Several experimental results are also listed for each type. Based on that various parameters and there effect on wastewater treatment is also covered. A small comparison is also made for Fenton process with some other AOPs. At end future prospect of Fenton process with some of R&D aspect are discussed to scale-up the process.