| Titre : |
Reducing chemical consumption and waste water COD loadings by recycling in conjunction with membrane filtration |
| Type de document : |
texte imprimé |
| Auteurs : |
K. Hellinger, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 37-41 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux -- Déchets
Eaux usées -- Recyclage
Filtration
Membranes (technologie)
Produits chimiques -- Consommation -- Réduction
Séparation (technologie)
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The production of high quality chrome-free leather is becoming of greater importance to leather users particularly in the auto and furniture sector. However, for the production of very soft chrome-free leathers higher amounts of fatliquor, vegetable and synthetic tans are required. These quantities are greater than needed for leathers made from wet blue, and exceed the amounts which can be bound by the leather. These non-bound materials therefore remain in the process liquors and give rise to high COD in the effluent.
A simple reduction in the offer of fats and retans to reduce this wastage does not solve the problem, as it leads to a deterioration of handle, softness and fullness. Wider introduction of leathers based on wet white therefore results in higher chemical costs, and increased effluent loadings and charges. |
| Note de contenu : |
- Limiting factors in recycling
- Membrane separation techniques and applications
- Leather processing using membrane separation and float recycling
- Optimising recycling technology
- Economic and ecological findings
- Fig. 1 : Additions of fatliquor and retanning material added to wet white and wet blue based on shaved weight
- Fig. 2 : Analysis of mixed process liquors from processing
- Fig. 3 : Residual COD from various stages in the production of furniture upholstery leather from wet white
- Fig. 5 : Ultrafiltration of mixed floats from furniture and auto upholstery processing
- Fig. 6 : Model for recycling within retanning, fatliquoring and dyeing
- Fig. 7 : Ultrafiltration of the residual neutralisation/ retannage / fatliquoring float
- Fig. 8 : Technique used for recycling the retentate from the neutralising / retanning / fatliquoring stage
- Fig. 9 : Analysis of residual floats from multi-recycling
- Fig. 10 : Effect of recycling on fat distribution |
| En ligne : |
https://drive.google.com/file/d/1Zwebj4sXmkkmKXaKvVxH-Rk1kOujismq/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32184 |
in WORLD LEATHER > Vol. 14, N° 7 (11/2001) . - p. 37-41
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