| Titre : |
Non-ammonia deliming using sodium hexametaphosphate and boric acid |
| Type de document : |
texte imprimé |
| Auteurs : |
Yunhang Zeng, Auteur ; Jiahong Lu, Auteur ; Xuepin Liao, Auteur ; Qiang He, Auteur ; Bi Shi, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
p. 257-263 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Borique, Acide
Cuirs et peaux -- Analyse
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Eaux usées -- Analyse
Hexamétaphosphate de sodium
Sels d'ammonium
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The use of ammonium salt in the deliming process is the primary reason for high ammonia nitrogen content in tannery wastewater. To reduce ammonia nitrogen pollution, a composite of sodium hexametaphosphate (SHMP) and boric acid (BA) was employed for non-ammonia deliming. The synergistic effect of SHMP and BA on deliming of limed cattle hide was investigated by analyzing the pH of deliming liquor, the extent of removal of calcium in pelt and the concentration of total nitrogen (TN) in the effluent. The experimental results indicated that the lowest pH of float during SHMP and BA deliming process was 7.08 and the concentration of hydroxyproline in the deliming liquor was lower than that of ammonia sulfate deliming, which suggest that deliming by SHMP and BA can reduce the damage of pelts. The extent of calcium removal from pelts delimed by using 3 % SHMP and 1 % BA was comparable to that of the pelts delimed with 3.5 % ammonium sulfate. FESEM images and EDS analysis indicated that the deliming by SHMP and BA produced clearer grain with less calcium salts. Compared with ammonium sulfate deliming, TN concentration in SHMP and BA deliming float was reduced by 85 %. |
| Note de contenu : |
EXPERIMENTAL METHODS : Materials - Deliming processes - Analyses of effluents and pelts - Estimation methods : Determination of Hyp concentration - Determination of TN and TOC concentrations - Determination of calcium content and extent of calcium removal
RESULTS AND DISCUSSION : pH of deliming liquors - Extent of calcium removal from pelts - TN and TOC in deliming effluents |
| En ligne : |
https://drive.google.com/file/d/1ZobH-Rc22M3p5Es6l9D_Tz1bQE6X-VMq/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11887 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 9 (09/2011) . - p. 257-263
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