Enhancement of the advanced Fenton process by ultrasound for decolorisation of real textile wastewater / Chih-Huang Weng in COLORATION TECHNOLOGY, Vol. 130, N° 2 (04/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 2 (04/2014) . - p. 133-139 Titre : Enhancement of the advanced Fenton process by ultrasound for decolorisation of real textile wastewater Type de document : texte imprimé Auteurs : Chih-Huang Weng, Auteur ; Yao-Tung Lin, Auteur ; Na Liu, Auteur ; Hong-Yang Yang, Auteur Année de publication : 2014 Article en page(s) : p. 133-139 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Oxydation Coût-Efficacité Décoloration Eaux usées -- Epuration Fenton, Réaction de Oxyde de fer Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. pH Ultrasons Index. décimale : 667.3 Teinture et impression des tissus Résumé : Successful decolorisation of real textile wastewater was achieved by means of the advanced Fenton process in conjunction with ultrasound technology. A synergy factor of 6.9 for this combined method was determined. The decolorisation followed zero-order kinetics, and the rate increased with increasing zero-valent iron dose and decreasing pH and hydrogen peroxide concentration. The optimum conditions for an American Dye Manufacturers Institute decolorisation value of 1638 ADMI was found to be a pH of 3.0, an ultrasound frequency of 47 kHz, a zero-valent iron dose of 1.0 g l?1, and a hydrogen peroxide concentration of 1.03 × 10?2 m. Under these conditions, the estimated operating cost to decolorise 96% true colour was estimated to be $US 4.51 m?3. The study demonstrated that the given combined method could be applied to decolorise textile wastewaters. Note de contenu : - EXPERIMENTAL : Materials - Textile wastewater - True colour analysis - Sono-advanced Fenton process experiments - RESULTS AND DISCUSSION : Comparison of direct and indirect sonolysis - Comparison of different oxidation processes - Effect of pH - Effect of H2O2 - Effect of Fe0 - Effect of the initial ADMI - Preliminary cost analysis DOI : 10.1111/cote.12069 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12069 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20869 [article]

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Spent green tea leaves for decolourisation of raw textile industry wastewater / Chih-Huang Weng in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 298–304 Titre : Spent green tea leaves for decolourisation of raw textile industry wastewater Type de document : texte imprimé Auteurs : Chih-Huang Weng, Auteur ; Yao-Tung Lin, Auteur ; Yen-Jung Chen, Auteur ; Yogesh Chandra Sharma, Auteur Année de publication : 2013 Article en page(s) : p. 298–304 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Bains de teinture -- Epuration Déchets végétaux -- Recyclage Décoloration Eaux usées -- Epuration Poudres Thé vert et constituants Index. décimale : 667.3 Teinture et impression des tissus Résumé : True colour measurements of wastewater samples, in terms of American Dye Manufacturers' Institute values, were used to evaluate the effectiveness of decolourisation of textile wastewater using spent green tea leaf powder waste. Raw wastewater samples with a true colour of 868 ADMI were used in the batch adsorption experiments. Results revealed that the true colour removal efficiency of the raw textile wastewater was high in acidic solution and at high temperature, indicating an endothermic nature of the system. The major functional groups of the green tea leaf powder waste involved in adsorption were identified by Fourier Transform-infrared spectroscopy analysis. Adsorption kinetic data were modelled using the modified Freundlich and intraparticle diffusion kinetics equations. Fitting results of the Langmuir adsorption isotherm showed that the adsorption capacity of the green tea leaf powder waste was 775 ADMI g−1, which is higher than that of powder activated carbon (526 ADMI g−1). The low activation energy values (13.9 kJ mol−1) suggested that adsorption was governed by a diffusion process and the reaction involved a physisorption mechanism. From the perspectives of waste utilisation, remarkable colour adsorption capacity and inexpensive and abundant availability, green tea leaf waste is an attractive alternative for decolourisaton of textile wastewater. Because high temperature favours colour removal, green tea leaf powder can be directly applied in raw textile wastewater treatment. DOI : 10.1111/cote.12029 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12029/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19043 [article]

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