[article]
| Titre : |
Evaluation of environmental impact of typical leather chemicals. Part 2 : Biodegradability of organic tanning agents by activated sludge |
| Type de document : |
texte imprimé |
| Auteurs : |
Danhong Sun, Auteur ; Qiang He, Auteur ; Zhang Wenjun, Auteur ; Yulu Wang, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 59-64 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Acrylique
Agents de tannage
AldéhydesUn aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle.
L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse.
Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde.
Biodégradation
Boues résiduaires -- Analyse
Composés aromatiques
Composés organiques
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Environnement -- Etudes d'impact
Evaluation
Syntans
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The biodegradability of typical organic tanning agents, including aromatic syntans, aldehydic tanning agents and acrylic tanning agents, were investigated. The results showed that the biodegradation behaviours of these leather chemicals are closely associated with their chemical structures, molecular weights and compositions. Therefore, different organic tanning agents might result in different environmental impacts even though they belong to the same type of tanning agent. The four aromatic syntans tested exhibited low biodegradability in general. Among them, a phenol-based syntan was not biodegradable and the phenol-sulphone based syntan produced a strong inhibitory effect on respiration of activated sludge. Comparatively, the naphthalene-based syntan was somewhat easier to biodegrade than other aromatic syntans. In the cases of aldehydic tanning agents, both formaldehyde and glutaraldehyde were not biodegradable and were toxic to organisms in activated sludge. Thus, they are potential inhibitors to biodegradation of other organic compounds in wastewater. However, an aliphatic aldehydic tanning agent was biodegradable and showed no toxicity to microorganisms in activated sludge. As for acrylic tanning agents, results indicated that commercial anionic products do not have any negative effect on biodegradation activity of activated sludge but they themselves were hardly biodegraded. Whereas, cationic acrylic tanning agents have the potential to inhibit the activated sludge process when presented at a high concentration. |
| Note de contenu : |
- Biodegradability of aromatic syntans
- Biodegradability of aldehydic tanning agents
- Biodegradability of acrylic tanning agents
- Table 1 : The types and main properties of organic tanning agents used in experiments
- Table 2 : BOD5 /COD values of aromatic syntans
- Table 3 : BOD5 /COD values of aldehydic tanning agents |
| En ligne : |
https://drive.google.com/file/d/1O2b7myavpoCSbVBi0--SckW-RKh98-ca/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38931 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 2 (03-04/2008) . - p. 59-64
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Evaluation of environmental impact of typical leather chemicals. Part 2 : Biodegradability of organic tanning agents by activated sludge in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 2 (03-04/2008)
