Decolorization of disperse red 354 azo dye in water by several oxidation processes—a comparative study

Neamţu, Mariana; Yediler, Ayfer; Siminiceanu, Ilie; Macoveanu, Matei; Kettrup, A.

doi:10.1016/s0143-7208(03)00129-3

Cited by 219 publications

(120 citation statements)

References 13 publications

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“…Physicochemical methods such as chemical precipitation, solvent extraction, chemical oxidation, biological treatments and ion exchange processes have been employed for heavy metal removal from industrial wastewaters (Neamtu et al, 2004;Wahi et al, 2005;Rao and Rao, 2006;Chen and Zhao, 2009;Calero et al, 2009). These methods are sometimes expensive, are not effective at low metal concentrations, and produce sludge to be disposed of, although sludges can be good materials to remove heavy metals (Barros et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Yılmaz

Tay

Kıvanç

et al. 2010

Braz. J. Chem. Eng.

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-Enterococcus faecium, a lactic acid bacterium (LAB), was evaluated for its ability to remove copper(II) ions from water. The effects of the pH, contact time, initial concentration of copper(II) ions, and temperature on the biosorption rate and capacity were studied. The initial concentrations of copper(II) ions used to determine the maximum amount of biosorbed copper(II) ions onto lyophilised lactic acid bacterium varied from 25 mg L -1 to 500 mg L -1 . Maximum biosorption capacities were attained at pH 5.0 and 6.0. Temperature variation between 20°C and 40°C did not affect the biosorption capacity of the bacterial biomass. The highest copper(II) ion removal capacity was 106.4 mg per g dry biomass. The correlation regression coefficients show that the biosorption process can be well defined by the Freundlich equation. The change in biosorption capacity with time was found to fit a pseudo-second-order equation.

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Section: Introductionmentioning

confidence: 99%

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Yılmaz

Tay

Kıvanç

et al. 2010

Braz. J. Chem. Eng.

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“…Parmi les méthodes de L'ozone, oxydant puissant, se décompose rapidement en dioxygène et oxygène atomique et doit être produit impérativement « in situ » grâce à l'émission d'une charge électrique sous haute tension dans un courant d'air sec. L'emploi de l'ozone sur les colorants a montré que les effluents chargés réagissent différemment selon leur composition (ALVARES et al, 2001;NEAMTU et al, 2004;SoLozHENko et al, 1995;zHANG et al, 2004). Les rejets contenant des colorants dispersés et soufrés sont particulièrement difficiles à décolorer (SoLozHENko et al, 1995), alors que ceux chargés de colorants réactifs, basiques, acides et directs le sont assez rapidement.…”

Section: Traitements Chimiquesunclassified

Les colorants textiles sources de contamination de l’eau : CRIBLAGE de la toxicité et des méthodes de traitement

Mansour¹,

Boughzala

Dridi

et al. 2011

rseau

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Les colorants sont largement utilisés dans les imprimeries, les produits alimentaires, cosmétiques et cliniques, mais en particulier dans les industries textiles pour leur stabilité chimique et la facilité de leur synthèse et leur variété de couleurs. Cependant, ces colorants sont à l’origine de la pollution une fois évacués dans l’environnement. La production mondiale des colorants est estimée à plus de 800 000 t•an-1 et les colorants azoïques sont majoritaires et représentent 60-70 %. Compte tenu de la composition très hétérogène de ces derniers, leur dégradation conduit souvent à la conception d’une chaîne de traitement physique-chimique et biologique assurant l’élimination des différents polluants par étapes successives. Dés études ont montré que plusieurs colorants azoïques sont toxiques et mutagènes et le traitement biologique de ces colorants semble présenter un intérêt scientifique majeur. Les traitements physico-chimiques communs (adsorption, coagulation/floculation, précipitation etc.) sont couramment utilisés pour les effluents industriels. Malgré leur rapidité, ces méthodes se sont avérées peu efficaces compte tenu des normes exigées sur ces rejets. Le traitement biologique constitue une alternative fiable; en effet, plusieurs microorganismes sont capables de transformer les colorants azoïques en sous-produits incolores. Les bactéries dégradent les colorants azoïques en deux étapes : un clivage de liaison azo, par l’intermédiaire de l’azoréductase, suivi d’une oxydation des amines aromatiques formées lors de la première étape. L’azoréduction constitue alors une étape clé du traitement des effluents chargés de ces colorants.Dyes are widely used for industrial, printing, food, cosmetic and clinical purposes as well as textile dyeing because of their chemical stability, ease of synthesis, and versatility. Their stability, however, causes pollution once the dyes are released into the environment in effluents. More than 800,000 tons of dyes are annually produced worldwide, of which 60 to 70% are azo dyes. Considering the heterogeneous composition of these latter dyes, their degradation usually requires a chain of physical, chemical and biological treatments assuring the elimination of different pollutants in successive steps. In addition, some azo dyes are toxic and mutagenic and thus the biological treatment of these dyes is now of major scientific interest. Physical-chemical treatments (adsorption, coagulation/flocculation precipitation, etc.) are usually used for industrial effluents. In spite of their rapidity, these methods have turned out to be ineffective in attaining the standards required for these discharges. As a viable alternative, biological processes are receiving increasing interest owing to their cost effectiveness and their ability to produce less sludge. It has been found that some microorganisms can transform azo dyes into colourless products. Bacterial degradation of azo dyes is often initiated by an enzymatic biotransformation step that involves cleavage of azo linkages with the aid of...

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“…There are several alternative methods used to decolorize the textile wastewater such as various combinations of physical, chemical and biological treatment and colour removal methods, but they cannot be effectively applied for all dyes and these integrated treatment methods are not cost effective. Advanced Oxidation Processes (AOPs) for the degradation of non-biodegradable organic contaminants in industrial effluents are attractive alternatives to conventional treatment methods and are capable of reducing recalcitrant wastewater loads from textile dyeing and finishing effluents (Galindo et al, 2001, Robinson et al, 2001, Azbar et al, 2004, Neamtu et al, 2004. In this section, applied AOPs for colour removal from textile effluent are given.…”

Section: Colour Removal From Textile Industry Wastewater By Aopsmentioning

confidence: 99%

Decolorisation of Textile Dyeing Effluents Using Advanced Oxidation Processes

Yonar¹

2011

Advances in Treating Textile Effluent

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Decolorization of disperse red 354 azo dye in water by several oxidation processes—a comparative study

Cited by 219 publications

References 13 publications

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Les colorants textiles sources de contamination de l’eau : CRIBLAGE de la toxicité et des méthodes de traitement

Decolorisation of Textile Dyeing Effluents Using Advanced Oxidation Processes

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