Fenton´s Process for the Treatment of Mixed Waste Chemicals

Benatti, Cláudia Telles; Tavares, Célia Regina Granhen

doi:10.5772/31225

Cited by 10 publications

(2 citation statements)

References 57 publications

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“…2a, 3a). Even when changing the entire H2O2 concentration range, a low pH is responsible for a high decolourization percentage, which is in accordance with the literature data where is stated that Fenton process is most effective in the narrower pH range (2)(3)(4). Lower efficacy can be explained due to H2O2 instability at higher pH values, where it starts to break down on molecular oxygen without forming a sufficient amount of HO • (Torrades & Garcia-Montano, 2014; Nidheesh, 2015)).…”

Section: Resultssupporting

confidence: 91%

Examination of the Application Possibilities of Waste Red Mud in Treatment of Colored Effluent

Kulić¹,

Bečelić‐Tomin²,

Kerkez³

et al. 2018

Proceedings of 9th International Symposium on Graphic Engineering and Design

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The most important component of coloured wastewaters is the synthetic dyes, which cause negative effects on aquatic ecosystems due to great solubility and persistence. Previous research points out that the heterogeneous Fenton process can be applied as an effective treatment of this type of wastewater. In this paper, the possibility of using waste red mud (RM), as a catalyst for the Fenton reaction, has been investigated. Sample of wastewater was obtained from the local textile industry, as follows: effluent before and after biological treatment. The optimization process was carried out using the response surface methodology, where the pH value, the concentration of H2O2 and the catalyst dose was varied. The following optimal reaction conditions were obtained for raw effluent: pH=3.26; [H2O2]=10 mM; [RM]=0.09 g, while for effluent after biological treatment: pH=3; [H2O2]=4.28 mM; [RM]=0.1 g. Under the given conditions, the efficiency of the Fenton process was 61.83 and 79.65%, respectively.

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Section: Resultssupporting

confidence: 91%

Examination of the Application Possibilities of Waste Red Mud in Treatment of Colored Effluent

Kulić¹,

Bečelić‐Tomin²,

Kerkez³

et al. 2018

Proceedings of 9th International Symposium on Graphic Engineering and Design

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“…hui Zhang et al 2019;Oturan et al 2012;Oliveira et al 2014). This reaction was recognized by its great success and high efficiency to remove many organic and inorganic recalcitrant compounds from soil and water (Telles and Granhen Tavares 2012;Nidheesh et al 2013;Yue et al 2015;Martínez-Costa et al 2018;Giraldo-Aguirre et al 2018;Verma and Chaudhari 2020). This is due to the intensive oxidative power, short lifetime, and high reactivity of the ⋅ OH radicals (Cheng et al 2016;Buxton et al 1988;García et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Insights into the generation of hydroxyl radicals from H2O2 decomposition by the combination of Fe2+ and chloranilic acid

Ahmad

Bensalah

2021

Int. J. Environ. Sci. Technol.

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In this work, the degradation of chloranilic acid (CAA) by chemical oxidation with H2O2 alone and in the presence of ferrous iron Fe2+ catalyst was investigated in order to improve our understanding on the novel metal-independent approach. The interesting and efficient metal-independent hydroxyl radicals (OH) production by using halogenated quinones and H2O2 has been currently demonstrated. The results clearly confirmed the formation of OH radicals from the reaction of CAA with H2O2. CAA was slowly decayed by chemical oxidation with H2O2 and followed a pseudo-first kinetics. H2O2 doses ≥ 1000 mM were required to achieve complete CAA decay from 1 mM CAA. However, low total organic carbon (TOC) removal was measured with the accumulation of carboxylic acids. The addition of Fe2+ enhanced the kinetics of CAA degradation and reduced the required dose of H2O2. High TOC removal was obtained, almost complete release of chloride ions, without accumulation of carboxylic acids. The decolorization of methylene blue (MB) aqueous solutions was performed using H2O2, H2O2/CAA, H2O2/Fe2+, and H2O2/CAA/Fe2+. H2O2/CAA/Fe2+ was the most effective method in decolorizing MB solutions due to the accelerated Fe2+ regeneration. Coupling Fenton reagent with CAA seems to be promising alternative to physical activation in water and soil treatment.

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Treatment of organic pollutants by homogeneous and heterogeneous Fenton reaction processes

Jain¹,

Singh²,

Kim

et al. 2018

Environ Chem Lett

323

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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.

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Fenton´s Process for the Treatment of Mixed Waste Chemicals

Cited by 10 publications

References 57 publications

Examination of the Application Possibilities of Waste Red Mud in Treatment of Colored Effluent

Examination of the Application Possibilities of Waste Red Mud in Treatment of Colored Effluent

Insights into the generation of hydroxyl radicals from H2O2 decomposition by the combination of Fe2+ and chloranilic acid

Treatment of organic pollutants by homogeneous and heterogeneous Fenton reaction processes

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