Photo-Fenton and Fenton Oxidation of Recalcitrant Industrial Wastewater Using Nanoscale Zero-Valent Iron

Hansson, Henrik; Kaczala, Fábio; Marques, Márcia; Hogland, William

doi:10.1155/2012/531076

Cited by 49 publications

(22 citation statements)

References 43 publications

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“…Those are also the strongest effects. This statement is consistent with the conclusion of low pH values as running the Fenton's or photo-Fenton reaction (ArslanAlaton et al 2009;Hansson et al 2012). …”

Section: Statistical and Multiple Regression Analysissupporting

confidence: 88%

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Optimization of the Photochemical Degradation of Textile Dye Industrial Wastewaters

Dang

Mai

Truong³

et al. 2017

AJSTD

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In this study, the photochemical degradation via photo-Fenton process was carried out to degrade dyes in textile industrial wastewaters. Experimental design methodology was also applied for optimizing effects of factors which influence the effective treatment such as ferric dose, hydroperoxide dosage, initial pH, reaction time and initial chemical oxygen demand (COD). Two independent variables namely colour and COD removal efficiencies were used to evaluate the treatment yield. Under the optimal conditions, ca. 99% and ca. 88%, colour, and COD were removed, respectively.

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Section: Statistical and Multiple Regression Analysissupporting

confidence: 88%

“…In this work, the photo-Fenton's reaction took place in a glass-jacket immersion-type UVreactor which was modified from the system developed by Hansson et al (2012).…”

Section: Methodsmentioning

confidence: 99%

Optimization of the Photochemical Degradation of Textile Dye Industrial Wastewaters

Dang

Mai

Truong³

et al. 2017

AJSTD

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“…This positive effect on the TOC reduction by ozone associated to UV has also been previously reported (Chin and Bérubé 2005). When comparing the efficiency of Fenton and photoFenton to treat similar cleaning wastewaters, we also found the UV was a relevant factor in promoting TOC reduction (Hansson et al 2012). According to Gottschalk et al (2009), the use of UV is a well-known strategy to assist the ozonation processes by increasing the production of HO·.…”

Section: Treatment Efficiency-cod and Toc Reductionssupporting

confidence: 85%

“…AOPs come in many forms, either as single ozone treatment at higher pH (>10) or combined with UV light or transition metals to generate HO· (Tunay et al 2010). Besides ozone combinations, Fenton and UV/Fenton have been widely tested; Fenton has proved to be one optional treatment for cleaning/ washing wastewaters generated by the wood-floor industry (Hansson et al 2012). The HO· is one of the strongest oxidizing agents (E=2.73 V), due to its nonselectivity and capability of prompt oxidation of a broad range of organic pollutants (Torrades et al 2011).…”

mentioning

confidence: 99%

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

Hansson

Kaczala

Amaro

et al. 2015

Water Air Soil Pollut

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Ozone and ozone-based advanced oxidation processes were applied for the treatment of a recalcitrant wastewater generated by wood-based industries that contains different inorganic and organic constituents and high chemical oxygen demand (COD) varying between 3,400 and 4,000 mg/L. The investigation used a tubular ozone reactor combined with an UV reactor designed for different hydraulic retention times. The dependent variables addressed to evaluate the treatment efficiency were the reduction of COD and total organic carbon (TOC) and the biodegradability of the treated effluent based on respirometric studies using activated sludge from a wastewater treatment. The results showed that even though ozonation alone at acid pH promoted COD and TOC reductions of 65 and 31 % respectively, a decrease in the biodegradability was observed. The most effective treatment (COD and TOC reductions of 93 and 43 %, respectively) was obtained when applying ozone combined with UV light at basic pH. The ozone-UV combination was capable of increasing the amount of readily available COD by 75 % with an additional reduction of TOC by 60 %. In conclusion, ozonation at low pH effectively reduces the COD content in wastewater generated by the wood-based industry; however, in order to combine advanced oxidation with biological process, ozone combined with UV is recommended.

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“…Among the AOP, the called Fenton process is a powerful source of hydroxyl radicals (that decompose organic matter), products of the reaction between ferrous iron Fe +2 and hydrogen peroxide (H 2 O 2 ). In the presence of sunlight the efficiency of the process is amplified and it is called, then, photo-Fenton oxidation [3]. Thus there is an increase in the degradation of H 2 O 2 by light absorption and the photolysis of Fe +2 organic complex generated during decomposition.…”

mentioning

confidence: 99%

Treatment of Biodiesel Contaminants Through Solar Photo-Fenton Oxidation Using a Stand-Alone Photovoltaic System

Oliveira

Santos

Vieira

et al. 2014

Frontiers in Optics 2014

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Biodiesel effluents were treated via photo-Fenton oxidation absorbing sunlight through a catalytic reactor connected to a stand-alone photovoltaic system, decreasing of almost 34% the biodiesel contaminants while storing energy to aid the whole process. OCIS codes: (040.5350); (350.5130)The scarcity of petroleum instigated studies suggesting the use of biofuels to substitute diesel [1]. Biodiesel can be added to petroleum diesel or used alone. As long as the generated effluents in biodiesel production are a problem to the environment especially due to the residues and organic pollutants of hard degradation associated with them, new technologies applicable to the treatment of effluents are searched, such as advanced oxidation processes (AOP) [2]. They have the advantage of destroying completely the organic contaminants, converting them into carbon dioxide, water and inorganic salt. Among the AOP, the called Fenton process is a powerful source of hydroxyl radicals (that decompose organic matter), products of the reaction between ferrous iron Fe +2 and hydrogen peroxide (H 2 O 2 ). In the presence of sunlight the efficiency of the process is amplified and it is called, then, photo-Fenton oxidation [3]. Thus there is an increase in the degradation of H 2 O 2 by light absorption and the photolysis of Fe +2 organic complex generated during decomposition. In this work, we report the use of photo-Fenton oxidation to treat biodiesel effluents, based in an experimental setup consisting of a photo catalytic reactor [4], in the center of which there is a transparent pyrex where the effluent pass by and absorbs radiation, as shown if figure 1(a). Distinct samples were formed by different concentrations of H 2 O 2 and Fe +2 solutions added to 1500 ml of biodiesel effluent and the wavelengths used for measurement of radiation intensity were 254 nm and 365 nm. Data about chemical oxygen demand (COD) in each sample during the photo-Feton oxidation allowed the identification of the best conditions for the reduction of this parameter in biodiesel effluent (the smaller COD, less contaminants remain in biodiesel). Results show that the sample (with a flow of 226,8 L/h) with solutions of concentration of 500 mg/L H 2 O 2 + 250 mg/L Fe +2 , had a decrease of 33,7% in its COD, meaning that the contaminants in this biodiesel sample were destroyed at this rate. Fig. 1. Catalytic reactor where biodiesel effluent absorbs light (a), COD variation for the sample with 500mg/L H2O2 + 250mg/L Fe +2 (b) and the isolated photovoltaic system (c).In order to aid the performance of the catalytic reactor, a stand-alone photovoltaic system [5], shown in figure 1(c), was built and coupled with the reactor in order to store energy and convert it in useful power, playing the role of a centrifugal pump of 0.5 hp, what makes the effluent´s samples circulating while the photo-Fenton oxidation occurs. The system dimensionment was realized through a computational tool developed in this work using

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Photo-Fenton and Fenton Oxidation of Recalcitrant Industrial Wastewater Using Nanoscale Zero-Valent Iron

Cited by 49 publications

References 43 publications

Optimization of the Photochemical Degradation of Textile Dye Industrial Wastewaters

Optimization of the Photochemical Degradation of Textile Dye Industrial Wastewaters

Advanced Oxidation Treatment of Recalcitrant Wastewater from a Wood-Based Industry: a Comparative Study of O3 and O3/UV

Treatment of Biodiesel Contaminants Through Solar Photo-Fenton Oxidation Using a Stand-Alone Photovoltaic System

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