| Titre : |
Reduction of waste chrome levels in tannery wastewater : Optimized recycling |
| Type de document : |
texte imprimé |
| Auteurs : |
A. Crispim, Auteur ; M. MOTA, Auteur |
| Année de publication : |
2006 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Déchets -- Réduction
Eaux usées -- Recyclage
PicklageLe picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu.
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The chrome tanning process is the most popular tanning method but it results a considerable discharge of chromium to the wastewater. Various processes have been developed to increase the up-take of chromium by the hide with success, but there remains a major chromium discharge to the wastewater.
The wastewater from the tanning process can be reused directly or indirectly but these recycling processes can present problems related to the accumulation of undesirable substances (salts, fat, protein, etc.) and irregularities from batch to batch. The present work is devoted to the development of a direct recycling process that associates a high chromium up-take process with recycling to the pickling bath and then disposal of this bath after pickling.
A reduction of the chromium offer to between 4.5% and 5.5% is achieved, against typical values of between 7% and 8%. Good results are obtained for chromium discharge to the wastewater especially when the splitting is done in the lime state where values of chromium about 50 mg/L are obtained. |
| Note de contenu : |
- Initial high exhaustion tannage
- First re-use of waste liquor as pickle
- Table 1 : Quantities used for the first phase of trials
- Table 2 : Quantities used for the recycling phase of trials
- Table 3 : Bath control results from the first phase of trials (initial tannages)
- Table 4 : Wet-blue tests from the first phase of trials
- Table 5 : Bath control results from the second phase of trials
- Table 6 : Wet-blue tests from the second phase of trials |
| En ligne : |
https://drive.google.com/file/d/1pOoQgASqW04JYwHvWX6yqku2CmSal0YI/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39108 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 6 (11-12/2006)
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Reduction of waste chrome levels in tannery wastewater : Optimized recycling in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 6 (11-12/2006)
