| Titre : |
Nitrogen-free deliming and its effect on tannery effluent |
| Type de document : |
texte imprimé |
| Auteurs : |
B. Germann, Auteur ; B. Eberle, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 71-72 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Acides organiques
Borique, Acide
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Eaux usées
Esters
Sels d'ammonium
Tannage -- Déchets
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The deliming process commences with a short rinse or wash, to remove free liming chemicals from the surface. As effective deliming is not feasible with washing alone, deliming agents are required to meet the following requirements:
- removal of calcium compounds from the hide
- reduction in alkalinity from the liming process
- reduction in alkaline swelling of the hide
- preparation for the bating process to pH 7.5 - 8.5
There are many deliming products available, and these can be placed in the following groups:
- Ammonium salts.
- Low ammonia containing deliming agents based on organic acids.
- Amomonia-free deliming agents based on boric acid + organic esters.
- Deliming agents based on organic esters.
The most generally used deliming agents are ammonium salts as the following advantages are offered:
- quick and mild deliming
- good buffer capacity
- low cost
The major disadvantage of using ammonium salts is that they create considerable ecological problems. |
| Note de contenu : |
- Evaluation of deliming agents
- Deliming conditions
- The ecological effects of ammonium compounds
- Interference with bacterial activity
- Fig. 1 : Nitrification & denitrification
- Fig. 2 : Oxygen absorption in nitrification test |
| En ligne : |
https://drive.google.com/file/d/1X2jP_krvKH_1EWFnsM6DO4puqUyLNRo-/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32176 |
in WORLD LEATHER > Vol. 14, N° 6 (10/2001) . - p. 71-72
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