| Titre : |
Evaluation of environmental impact of typical leather chemicals. Part 3 : Biodegradability of vegetable tannin extracts by activated sludge |
| Type de document : |
texte imprimé |
| Auteurs : |
Qiang He, Auteur ; Danhong Sun, Auteur ; Xin Liu, Auteur ; Lin Wei, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 103-106 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Biodégradation
Boues résiduaires -- Analyse
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Déchets industriels -- Elimination
Environnement -- Etudes d'impact
Tanins végétaux
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The short-term (5 day) and long-term (30 day) biodegradation behaviours of black wattle, bayberry, valonia and chestnut tannin extracts were systematically investigated in this paper. The results indicated that all of these four vegetable tannin extracts are biodegradable although they might retard the biodegradation process to some extent owing to the inhibitory effect of tannins on the activated sludge process. Short-term biodegradabilities of the four tannin extracts were concentration-dependent. These tannin extracts could be effectively biodegraded in 5 days at concentrations of 0.25g/L, but the biodegradation process was retarded remarkably when the concentrations were increased to 5.00g/L. In general, short-term biodegradabilities of the four tannin extracts follow the sequence of valonia tannin>chestnut tannin>bayberry tannin>wattle tannin, implying that the hydrolysable tannins are easier to biodegrade than the condensed tannins. The results of long-term biodegradation showed that all of the four vegetable tannin extracts can be completely biodegraded by prolonging the activated sludge process, even if they are present at high concentration. Therefore, the encouraging findings in this research suggest that vegetable tannin extracts are environmentally friendly leather chemicals. |
| Note de contenu : |
- BOD5/COD values of vegetable tannin extracts
- Respiration of activatedslud ge in the presence of vegetable tannin extracts
- COD removals of vegetable tannin extracts by the activatedslud ge process
- COD removals (%) of vegetable tannin extracts at different concentrations
- Table 1 : Type andtannin content of vegetable tannin extracts tested in experiments
- Table 2 : BOD5 /COD values of vegetable tannin extracts at different concentrations |
| En ligne : |
https://drive.google.com/file/d/1rkdcAB3YoMjEm3urqqTf-HjnXnzkK-x3/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38954 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 3 (05-06/2008) . - p. 103-106
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Evaluation of environmental impact of typical leather chemicals. Part 3 : Biodegradability of vegetable tannin extracts by activated sludge in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)
