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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Effect of mixed metal pretannage with zinc and titanium plus masking agents / Shan Cao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 120-123 Titre : Effect of mixed metal pretannage with zinc and titanium plus masking agents Type de document : texte imprimé Auteurs : Shan Cao, Auteur ; Baozhen Cheng, Auteur ; Bing Liu, Auteur ; Xiu He, Auteur Année de publication : 2015 Article en page(s) : p. 120-123 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Agents masquants Sulfate de titane Sulfate de zinc Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper focuses on the effect of masking agents and tanning with zinc and zinc-titanium metal complexes. Sodium formate, sodium acetate, sodium citrate and sodium tartrate were used as masking agents. The best masking condition was chosen corresponding to the highest shrinkage temperature. Zinc sulfate and titanium sulfate, in different concentrations, were chosen as tanning agents in mixed-tanning experiments. The highest shrinkage temperature of the wet-white was 77°C, and the attendant zinc content in its leather was 3.63%. After retannage with chrome powder, the shrinkage temperature of the resultant leather increased as expected, and reached 96°C. The wet-white was successfully split which tend to the use of non-chrome pre-tanning, the finished leather was able to meet the requirements. Note de contenu : - EXPERIMENTAL PROCEDURES : Equipment - Materials - Preparation of measuring reagents - Preparation of mixed-metal tanning agents - EXPERIMENTAL PROCEDURE : Influence of masking agents zinc tanning - Zinc-titanium mixed tanning - RESULTS AND DISCUSSION : Influences of masking agents on zinc tanning - Effect of mixed zinc-titanium tanning - Effect on retanning of the mixed metal tanning wet-white En ligne : https://drive.google.com/file/d/1MakJVyW6_eI8GMNg4NAJcxzaaoH6XVp0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24255 [article]

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