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Decolorisation of aqueous reactive dye Remazol Red 3B by electrocoagulation / Mehmet Kobya in COLORATION TECHNOLOGY, Vol. 126, N° 5 (2011)
[article]
Titre : Decolorisation of aqueous reactive dye Remazol Red 3B by electrocoagulation Type de document : texte imprimé Auteurs : Mehmet Kobya, Auteur ; Erhan Demirbas, Auteur ; Mustafa Sözbir, Auteur Année de publication : 2011 Article en page(s) : p. 282-288 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs
Conduction électrique
Décoloration
Electrocoagulation
Electrodes
ElectrolyseIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The present study demonstrated the applicability of the electrocoagulation method for the removal of reactive dye, Remazol Red 3B, in a batch study. Iron electrode material was used as a sacrificial electrode in monopolar parallel mode in this study. The effects of the initial pH, current density, conductivity, initial concentration of dye and electrolysis time on the removal of Remazol Red 3B were investigated to determine optimum operating conditions. High decolorisation efficiency (>99%) for Remazol Red 3B dye solution was obtained with optimal value of process parameters, such as 15 mA cm−2 of current density, 10 min of electrolysis time, pH 6 and 500 mg l−1 dye concentration. The energy consumption, electrode consumption and operating costs under optimum operating conditions were calculated as 3.3 kW h kg dye−1, 1.2 kg Fe kg dye−1 and 0.6 € m−3, respectively. Note de contenu : EXPERIMENTAL : Material and methods / Preparation of effluent / Analytical methods / Operating cost analysis of electrocoagulation / Electrocoagulation process.
RESULTS AND DISCUSSION : Effect of initial pH / Effect of current density / Effect of conductivity / Effect of operating time / Effect of dye concentration.DOI : 10.1111/j.1478-4408.2010.00259.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00259.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10892
in COLORATION TECHNOLOGY > Vol. 126, N° 5 (2011) . - p. 282-288[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012842 - Périodique Bibliothèque principale Documentaires Disponible 012846 - Périodique Bibliothèque principale Documentaires Disponible Denim dyeing effluent treatment by electrocoagulation for maximum reduction in indigo and sulphur black dye discharge / Maryam Mudasir in COLORATION TECHNOLOGY, Vol. 138, N° 6 (12/2022)
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Titre : Denim dyeing effluent treatment by electrocoagulation for maximum reduction in indigo and sulphur black dye discharge Type de document : texte imprimé Auteurs : Maryam Mudasir, Auteur ; Sami Ur Rehman, Auteur ; Muhammad Fahad, Auteur ; Ifra Raza, Auteur ; Feroz Alam, Auteur Année de publication : 2022 Article en page(s) : p. 621-631 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants au soufre Les colorants au soufre sont des colorants utilisés pour teindre de façon assez économique des fibres cellulosiques, principalement dans des nuances sombres (noir, brun, bleu foncé). Insolubles à l'état oxydé, ils sont rendus solubles par réduction à la soude caustique pour la teinture, dans un procédé analogue aux colorants de cuve, plus chers.
Les colorants s'obtiennent par action du soufre sur des composés organiques, notamment sur le 2-4-dinitrophénol (Sulphur Black 1) ou le toluène-2-4-diamine et la 4-nitroaniline (Sulphur Brown 12).
Eaux usées -- Epuration
Eaux usées -- Teneur en colorants
Electrocoagulation
Indigo
Jeans
Noir (couleur)Index. décimale : 667.3 Teinture et impression des tissus Résumé : The waste effluents of two different dyes including one vat dye Indigo and one sulphur dye (Stay Black) were treated using continuous electrocoagulation (EC) technique at a denim dyeing plant. A coagulator reactor of 3 L capacity was designed to treat 7.9 L/h to 65.4 L/h of the dye wastewater. Process parameters like pH, flow rate, number of electrodes and material of electrodes were optimised to obtain maximum decrease in chemical oxygen demand (COD) and colour of the effluents before discharge. It was found that by controlling process parameters, COD can be reduced up to 79% and 90% for low concentrated Indigo and sulphur Stay Black dyes, respectively, with a reduction of colour value 98% and 70%, respectively, while for higher effluent concentrations EC efficiency was reported for 81% and 72.3% colour and COD removal, respectively, for indigo dye and 89.3% and 77.6% colour and COD removal, respectively, for sulphur dye. Hence results of the proposed study could provide important information to design a scale up large reactor unit to commercially apply on denim dyeing discharge and control pollution limits of sulphur and sulphates during denim dyeing. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Methods
- RESULTS AND DISCUSSION : Effects of flow rates - Effects of pH of the wastewater - Effects of current density
- Table 1 : Characteristics of different dyeing wastes at the denim dying plant
- Table 2 : Effects of flow rate on chemical oxygen demand (COD), pH, total dissolved solid (TDS) and colour values of diluted indigo dye effluents from fourth washing stream after treatment through electrocoagulation (EC). Initial conditions of untreated sample is pH 11.88, TDS = 5340 mg/L, COD = 2740 mg/L, colour value = 0.5 g/L
- Table 3 : Effects of flow rate on chemical oxygen demand (COD), pH, total dissolved solid (TDS) and colour values of concentrated indigo dye effluents from first washing stream after treatment through electrocoagulation (EC). Initial conditions of untreated sample is pH 10.63, TDS = 5300 mg/L, COD = 5413 mg/L, colour value = 1.100 g/L
- Table 4 : Effect of changing pH on percentage colour and chemical oxygen demand (COD) removal, and zeta potential using nine stainless steel electrodes for indigo dye and six aluminium and three stainless steel electrodes for sulphur black dye
- Table 5 : Effects of electrocoagulation (EC) treatment on pH, total dissolved solid (TDS), chemical oxygen demand (COD) and colour values of indigo dye effluent and sulphur dark black effluent at low concentrations using all nine steel electrodes and three steel with six aluminium electrodes, respectively
- Table 6 : Effects of electrocoagulation (EC) treatment on pH, total dissolved solid (TDS), chemical oxygen demand (COD) and colour values of indigo dye effluent and sulphur dark black effluent at high concentrations using all nine steel electrodes and three steel with six aluminium electrodes, respectivelyDOI : https://doi.org/10.1111/cote.12625 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12625 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38376
in COLORATION TECHNOLOGY > Vol. 138, N° 6 (12/2022) . - p. 621-631[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23716 - Périodique Bibliothèque principale Documentaires Disponible Removal of chromium from tanning wastewater by chemical precipitation and electrocoagulation / Bianca Mella in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 2 (03-04/2016)
[article]
Titre : Removal of chromium from tanning wastewater by chemical precipitation and electrocoagulation Type de document : texte imprimé Auteurs : Bianca Mella, Auteur ; Ana Cláudia Cristófoli Glanert, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2016 Article en page(s) : p. 55-61 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eaux usées -- Epuration
Electrocoagulation
Précipitation (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although chromium is used in the form of basic chromium sulfate for processing hides, it has well-known adverse effects when improperly disposed of in the environment under certain circumstances when Cr(III) can be oxidized to Cr(VI). Tanneries use large amounts of water for processing hides ; hence, chromium recovery from tanning wastewater is an environmentally friendly and economically viable alternative, as it can prevent a greater amount of chromium-containing sludge from being disposed of in industrial hazardous waste landfills. Compliance with environmental legislation also poses a challenge to the leather industry, as the parameters for discharging treated wastewater into receiving water bodies are increasingly stringent, which encourages the practice of techniques for recovery and reuse of chemical inputs in the tanning of hides. This study focuses on the removal of the chromium present in tanning wastewater through chemical precipitation and electrocoagulation. In both methods, chromium is separated in the form of an insoluble precipitate either by the addition of alkali or by the oxidation and réduction of metal anodes. Chemical precipitation resulted in 99.74% of removal efficiency, while in electrocoagulation with aluminum, copper and iron efectrodes, removal efficiency was 97.76%, 69.91% and 90.27%, respectively. Note de contenu : - Wastewater sample
- Chemical precipitation
- Electrocoagulation reactor
- Analytical methodsEn ligne : https://drive.google.com/file/d/1oC6s2fUs82p2BGfS36WAMqlASuQ1TrD2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26087
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 2 (03-04/2016) . - p. 55-61[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17955 - Périodique Bibliothèque principale Documentaires Disponible Treatment of textile dyeing wastewater by electrocoagulation using Fe and Al electrodes : optimisation of operating parameters using central composite design / Mehmet Kobya in COLORATION TECHNOLOGY, Vol. 130, N° 3 (06/2014)
[article]
Titre : Treatment of textile dyeing wastewater by electrocoagulation using Fe and Al electrodes : optimisation of operating parameters using central composite design Type de document : texte imprimé Auteurs : Mehmet Kobya, Auteur ; Erhan Gengec, Auteur ; Mehmet Tonay Sensoy, Auteur ; Erhan Demirbas, Auteur Année de publication : 2014 Article en page(s) : p. 226-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Bains de teinture -- Epuration
Eaux usées -- Epuration
Electrocoagulation
Electrodes
Etudes comparatives
Fer
StatistiqueIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Textile dyeing wastewater was treated by electrocoagulation using aluminium and iron plate electrodes. Response surface methodology and central composite design were applied in the experiments and in statistical data analysis. A current density of 30–100 A m?2, an initial pH of 4–8, and an operating time of 10–40 min were chosen as independent variables, and the chemical oxygen demand, total organic carbon, and turbidity removal efficiencies and the operating cost were selected as responses in the electrocoagulation process. The developed quadratic models for the responses and the experimental data were in good agreement with model predictions statistically (R2 ? 0.92, Adj R2 ? 0.82, and Prob > F < 0.004). The optimised operating variables (initial pH, current density, and operating time) and the maximum total organic carbon, chemical oxygen demand, and turbidity removal efficiencies for textile dyeing wastewater were 5.5, 63.2 A m?2, 30.4 min, 77%, 82%, and 94% for the iron electrode and 5.6, 52.5 A m?2, 33.9 min, 68%, 69% and 99% for the aluminium electrode respectively. Minimum operating costs for the iron and aluminium electrodes under optimum conditions were €2.1 m?3 (€1.0 kg?1 COD) and €2.4 m?3 (€1.6 kg?1 COD). The iron electrode was found to be superior to the aluminium electrode in terms of removal efficiencies and operating cost for the treatment of textile dyeing wastewater. Note de contenu : - MATERIAL AND METHODS : Experimental set-up and procedure - Chemical analysis and operating cost - Experimental design and statistical analysis
- RESULTS AND DISCUSSION : Statistical analysis - Effect of variables on the removal efficiency - Effect of variables on energy consumption, electrode consumption, and operating cost - Optimisation resultsDOI : 10.1111/cote.12090 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12090 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21465
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Code-barres Cote Support Localisation Section Disponibilité 16271 - Périodique Bibliothèque principale Documentaires Disponible