| 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 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 1 (01-02/2005) . - p. 9-14
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An integrated approach for the treatment of vegetable tannins wastewaters in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 1 (01-02/2005)
