| Titre : |
Detanning chromium leather waste |
| Type de document : |
texte imprimé |
| Auteurs : |
Abigail Clare, Auteur ; Karl Flowers, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 38-40 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuir -- Déchets
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Déchets industriels -- Elimination
Détannage
Hydrolyse
Tannage au chrome
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
In 2019, approximately 341 million hides (9.1 million tonnes) were processed worldwide. For every ton of wet-salted raw material, approximately 600kg of combined wet and dry solid waste is generated, with 200-250kg of this being tanned waste. Tanned wastes contain collagen as the main component and pertain to shavings, splits, trimmings, and buffing dust etc.
Although leather is naturally biodegradable, the tanning process alters the rate of disintegration. By modifying collagen molecules, tanning agents stabilise the protein and slow the degradability of leather relative to raw hides/skins. Therefore, many tanned leather wastes end up in landfill or are incinerated, resulting in environmental impacts (if uncontrolled) on soil and groundwater (and in some cases the release of greenhouse gas emissions). Sustainable tanneries have good controls to prevent these problems, but it is useful to understand how improvements can be made to tanneries who are starting their sustainability journey or to improve those tanneries who already have good controls.
Detanning leather can give rise to alternative disposai routes for tanned solid wastes. By decreasing the degree of modification of the collagen fibres, tanning agents can be recovered and the remaining tan-free product can enter a composting process. Detanning enables the extracted products (collagen and tanning agents) to be recovered, recycled and reused in a circular economy. |
| Note de contenu : |
- Chromium-containing wastes
- Chromium recovery methods
- Acid hydrolysis
-Alkali hydrolysis
- Enzymatic hydrolysis
- Fig. 1 : Types of tanned leather waste
- Fig. 2 : The detanning process of leather
- Fig. 3 : The modification of collagen fibres during chromium tanning
- Fig. 4 : High Cr concentrations in soils can affect plant growth and development (suppression) |
| En ligne : |
https://drive.google.com/file/d/143SFY8BVSxJSQdc7_fOlcr-RAREpWt70/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37950 |
in INTERNATIONAL LEATHER MAKER (ILM) > N° 54 (07-08/2022) . - p. 38-40
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Detanning chromium leather waste in INTERNATIONAL LEATHER MAKER (ILM), N° 54 (07-08/2022)
