Titre : |
Green solution for salinity in tannery wastewater : a step forward in leather processing |
Type de document : |
texte imprimé |
Auteurs : |
Subramanian Saravanabhavan, Auteur ; Punitha Velmurugan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur |
Année de publication : |
2014 |
Article en page(s) : |
p. 214-223 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Chlorure de sodium Le chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin.
On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na).
Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène. Cuirs et peaux -- Analyse Cuirs et peaux -- Conservation Eaux usées -- Epuration Eaux usées -- Teneur en sels Hydroxyproline Polyéthylène glycol
|
Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
Résumé : |
The conventional leather processing method contributes to high salinity in wastewater due to the discharge of enormous amount of salts used for preservation. Hence, an attempt has been made to replace the salt with polyethylene glycol (PEG) to reduce the salinity in tannery wastewater. The molecular weight (MW) and percentage offer of PEG were standardized based on the rate of dehydration of hide matrix during preservation and rehydration of preserved hide matrix. The determination of hydroxyproline in spent soak liquors at various time periods during storage showed that the preservation of hides using PEG MW 2000 was more effective than sodium chloride. The reduction in total salinity by 43% is possible in tannery wastewater through PEG based preservation of raw hides. Functional characteristics of the experimental crust leathers are shown to be on par with control crust leathers. The developed greener process appears to be technically viable and economically acceptable alternative for salt based preservation. |
Note de contenu : |
- MATERIALS AND METHODS : Materials - Selection of molecular weight of PEG for preservation - Optimization of percentage offer of PEG MW 2000 for preservation - Rehydration studies - Scanning electron microscopy analysis - Differential scanning calorimetry and Fourier Transform Infrared Studies - Determination of hydroxiproline - Bulk preservation studies - Soaking operation for preserved control and experimental cow hide from bulk trials - Input and output analysis - Spent soak liquor and composite liquor analysis - Physical testing and hand evaluation of leathers
- RESULTS AND DISCUSSION : Underlying principle for selecting PEG for preservation - Selection of MW of PEG for preservation - Optimization of percentage offer of PEB MW 2000 for preservation - Scanning electron microscopy analysis - Differential scanning calorimetry and Fourier Transform Infrared studies - Comparison of the effectiveness of preservation method based on PEG MW 2000 and salt - Bulk trial studies : an appraisal input and output analysis - Analysis of soak liquor and composite liquor - Physical and hand evaluation of leathers - Techno-economic benefits |
En ligne : |
https://drive.google.com/file/d/1pFPmWHEqtaw8kHjM75xB5oaEE2opjVZg/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21706 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 7 (07/2014) . - p. 214-223