Ozonation of the reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) : kinetic assessment, ozonation products and ecotoxicity / Idil Arslan-Alaton in COLORATION TECHNOLOGY, Vol. 128, N° 5 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 5 (2012) . - p. 387-394 Titre : Ozonation of the reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) : kinetic assessment, ozonation products and ecotoxicity Type de document : texte imprimé Auteurs : Idil Arslan-Alaton, Auteur ; Gulcan Basar, Auteur ; Tugba Olmez, Auteur Année de publication : 2012 Article en page(s) : p. 387-394 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Oxydation Colorants réactifs Ozonation Index. décimale : 667.3 Teinture et impression des tissus Résumé : Ozonation of the commercially important, recalcitrant reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) was investigated. Ozonation performance was examined by following ozone absorption rates and K-Acid, chemical oxygen demand and total organic carbon removals. Mean oxidation states and unidentified organic products were also determined. At pH 3, where direct ozone reactions are dominant, the second-order rate constant between K-Acid and molecular ozone was determined as 20 m?1 s?1 for steady-state aqueous ozone concentration. The competition kinetics approach was also adopted where a reference compound, phenol, and K-Acid were subjected to ozonation. By applying this method, the second-order reaction rate constant was found to be 76 m?1 s?1. Common oxidation products formed during ozonation at pH 3, pH 7 and pH 7 with 1 mm hydrogen peroxide were identified as methoxy-phenyl-oxime, phenol, benzene, benzaldehyde and oxalic acid via high-performance liquid chromatography and gas chromatography/mass spectrometry analyses. Continuous nitrate and sulphate evolution were observed during K-Acid ozonation as a consequence of the abrupt release and subsequent oxidation of its amino and sulphonate groups. The number and amount of reaction products were most intensive for K-Acid ozonation at pH 7 with 1 mm hydrogen peroxide. According to the acute toxicity tests conducted with Vibrio fischeri, ozonation products were not less toxic than the original K-Acid solution that caused only 15% inhibition. Note de contenu : - EXPERIMENTAL : Materials - Ozonation experiments - Oxidation products identification - Other analytical procedures - Acute toxicity - RESULTS AND DISCUSSION : Baseline experiments - Kinetic assessment - Ozonation products and acute toxicity assessment - Changes i acute toxicity DOI : 10.1111/j.1478-4408.2012.00392.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00392.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15807 [article]

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Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes / Olcay Tünay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 123-131 Titre : Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes Type de document : texte imprimé Auteurs : Olcay Tünay, Auteur ; Z. Berker Yelmez, Auteur ; Tugba Olmez, Auteur ; Isik Kabdasli, Auteur Année de publication : 2006 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Biological treatment of effluents from industrial wastewaters often requires further treatment to comply with discharge standards. In this paper, an advanced oxidation processes and activated carbon adsorption were applied. Direct ozone reaction provided 70 % COD reduction. A readily oxidizable part of the substrate was defined. Catalytic ozone oxidation using ferric chloride proved to be very effective. Oxidation by ozone at pH 13 was fast and resulted in complete mineralization. The efficiency of O3/H2O2 system was dependent on O3/H2O2 ratio and at 1 mol/l mol ratio a better COD reduction than that of ozone alone was obtained. A kinetic equation was derived for the slower part of O3/H2O2 (1 mol/ 1 mol ) oxidation. Adsorption experiments were conducted using powdered and granular carbon. The time to attain the equilibrium was found to be long and COD removal efficiencies were below 25%. Use of powdered activated carbon in combination with an activated sludge process was recommended. En ligne : https://drive.google.com/file/d/161ZXVE48oUmEIbnGcUXwuIGSD4Mvvzhk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4015 [article]

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