An approach for the treatment of vegetable tan liquor containing hydrolysable tannins / A. Sharli in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 10 (10/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 10 (10/2003) . - p. 381-387 Titre : An approach for the treatment of vegetable tan liquor containing hydrolysable tannins Type de document : texte imprimé Auteurs : A. Sharli, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balaraman Madhan, Auteur Année de publication : 2003 Article en page(s) : p. 381-387 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In recent times leather industry is looking at options for a tanning system especially based on the natural products such as vegetable tanning materials. Nevertheless there is also a clear shortcoming in the usage of vegetable tanning materials because of the high organic load in the effluent generated, which is difficult to degrade and hence leads to high biological or chemical oxygen demand. Hence, in this study, methods to treat the effluent liquor containing myrobalan, a widely used hydrolysable tannin have been explored to reduce the pollution load generated by the same. Two methods have been adopted for the treatment of the myrobalan liquor. The first method involves breaking down of vegetable tannins to simpler compounds by oxidative degradation using hydrogen peroxide. The second method involves the precipitation of vegetable tannins using zinc sulfate as the precipitant. A 28% reduction in the COD has been obtained for the effluent liquor treated with H2O2 in the presence of Zerolite-Iron catalyst at 50°C. Myrobalan liquor precipitated with zinc sulfate at a pH of 10 has resulted in the reduction of COD by 74%. Additional reduction in the COD has been obtained by adapting the precipitation followed by oxidative degradation method in the presence of Zerolite-Iron catalyst, which has resulted in the reduction of COD load by 96%. En ligne : https://drive.google.com/file/d/1Mo8tKhLCzhOEqy3KmF-imU8IneHay7x8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4152 [article]

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An integrated approach for the treatment of vegetable tannins wastewaters / Balaraman Madhan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 1 (01-02/2005)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 1 (01-02/2005) . - p. 9-14 Titre : An integrated approach for the treatment of vegetable tannins wastewaters Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; A. Sharli, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2005 Article en page(s) : p. 9-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants Eaux usées -- Décontamination Eaux usées -- Epuration Potentiel zeta Précipitation (chimie) Sulfate de zinc Tanins végétaux Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Intensive leather making techniques in an eco-sensitive world have increased the attraction of a tanning system based on natural products such as plant polyphenolics. However, there is also a distinct disadvantage in the usage of such materials because of the high organic loading of the effluent which is also difficult to degrade due to the high oxygen demand. We have examined the treatment of vegetable tannery effluents aiming at the reduction of the pollution load. Two methods have been evaluated, one based on precipitation of tannins as zinc-tannate and another with oxidative degradation after precipitation. In the precipitation method, 0.5% wattle solution at pH10 is precipitated as zinc-tannate giving a 73% reduction in COD. A further reduction of the chemical oxygen demand by 97% has been obtained with the two-stage approach of precipitation followed by oxidative degradation in the presence of an immobilized iron catalyst. This integrated approach provides a viable solution to the problem of vegetable tannins in wastewaters. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Zeta potential measurements - Precipitation treatment - Two-step treatment - Treatment of industrial samples - RESULTS AND DISCUSSION : Treatment by precipitation method - Two-step treatment - Treatment of commercial vegetable tannin wastewater - Commercial scale treatment - Table 1 : Effect of pH on COD reduction of vegetable tannin solution - Table 2 : % Reduction of COD on precipitation of vegetable tannins with different amounts of zinc sulphate - Table 3 : COD of 0.5% wattle solution before and after treatment - Table 4 : COD of the commercial vegetable tannery wastewater before and after treatment En ligne : https://drive.google.com/file/d/1acFfI8-TAPuL5jjhh6K6TocBI1xyk5b6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39608 [article]

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