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)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 6 (12/2022) . - p. 621-631 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, respectively DOI : https://doi.org/10.1111/cote.12625 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12625 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38376 [article]

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