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Biodegradability of wastewater from enzymatic soaking and unhairing processes in leather Manufacture / Qiang He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 6 (06/2006) . - p. 217-222 Titre : Biodegradability of wastewater from enzymatic soaking and unhairing processes in leather Manufacture Type de document : texte imprimé Auteurs : Qiang He, Auteur ; Bi Shi, Auteur ; Danhong Sun, Auteur ; Kai Yao, Auteur Année de publication : 2006 Article en page(s) : p. 217-222 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Enzyme-treating processes in leather making are usually considered as 'clean technology' in terms of the reduction of pollutants in wastewater. The objective of this study is to investigate the biodegradability of the wastewater collected from enzyme-treating processes. It is of great significance to characterize the pollution properties of this kind of wastewater, and to provide a reference for the biological treatment of such wastewater in effluent treating yard of tannery. The research was typified by enzymatic soaking and unhairing (ESU) processes which are encouraged to be used in leather manufacture for reducing environmental impact. The biodegradability of ESU wastewater before and after settling treatment was investigated, in comparison with that of wastewater collected from conventional soaking and unhairing (CSU) processes. It was found that ESU wastewater had better biodegradability than CSU wastewater. The biodegradation extent of ESU and CSU wastewaters reached 58.5% and 37.7% respectively in 20 days of naturally biodegrading process. Moreover, it was found that, in the presence of activated sludge, 65.5% of the total oxygen-consuming materials in ESU wastewater is biodegradable, while the value of CSU wastewater is 58.2%. En ligne : https://drive.google.com/file/d/1jZAGItlsni_ZwfJIUXM0-ZesKVySf49O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3998 [article]

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Utilization of calcium alginate beads as adsorbent for removal of dyes from tannery wastewaters / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 6 (06/2006) . - p. 223-230 Titre : Utilization of calcium alginate beads as adsorbent for removal of dyes from tannery wastewaters Type de document : texte imprimé Auteurs : Rathinam Aravindhan, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur ; N. N. Fathima, Auteur Année de publication : 2006 Article en page(s) : p. 223-230 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The presence of color due to dyes in the effluents from leather industry is a major concern in today's eco-sensitive world. In this present study, the removal of three most commonly used dyes in leather industry, viz. acid, direct and metal complex dye, by adsorption onto calcium alginate beads has been studied in dynamic-batch mode. The effect of initial dye concentration, alginate quantity, size of the beads, pH and temperature on dye removal was studied for batch conditions. Experiments with commercial tannery dye effluents have also been carried out and the results indicate the potential of calcium alginate beads as effective adsorbents for removal of dyes from commercial tannery effluent. Desorption studies were carried out, which indicate the reuse potential of the alginate beads. The measured adsorption kinetics was well described by a pseudo-second order kinetic model. En ligne : https://drive.google.com/file/d/1KpAJDN_vsfMQwrZMk1lAEXAifuJOKM7B/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3999 [article]

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Sulphide free unhairing - studies on ozone based depilation / Victor John Sundar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 6 (06/2006) . - p. 231-234 Titre : Sulphide free unhairing - studies on ozone based depilation Type de document : texte imprimé Auteurs : Victor John Sundar, Auteur ; N. Vedaraman, Auteur ; P. A. Balakrishnan, Auteur ; Subhendu Chakrabarti, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2006 Article en page(s) : p. 231-234 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Epilage Oxydation Ozone Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sulphide free unhairing has been an active research topic. Oxidative unhairing is gaining attention of researchers. Efficacy of ozone depilation and influence of ozone on the physico - chemical characteristics of the leathers have been studied in detail. The ozone based system leads to complete unhairing and has been found to provide substantial benefits when used for unhairing. En ligne : https://drive.google.com/file/d/1SfckJ_ZjUarRSaNskwW3PX73cSFKt3Gf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4000 [article]

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Preparation and characterization of biopolymers derived from enzymatically modified gelatin and whey / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 6 (06/2006) . - p. 235-248 Titre : Preparation and characterization of biopolymers derived from enzymatically modified gelatin and whey Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 2006 Article en page(s) : p. 235-248 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Many authors have reported that biopolymers can be formed from enzymatic crosslinking between dissimilar proteins. It was shown that these products have the advantage of possessing the unique properties of each contributing protein and, at the same time, have the potential for generating innovative products. In this present study, we examined separately the properties of microbial transglutaminase-modified proteins, specifically gelatin, whey, and whey protein isolate (WPI), as well as their enzymatically-combined products. The physical properties and molecular weight distribution of the gelatin biopolymers show that the products had higher melting points, viscosities, and molecular weight distributions, and the degree of crosslinking was enhanced by addition of even small amounts of the secondary protein. There is potential that these products from relatively inexpensive sustainable resources may be used as fillers or as coatings in leather processing. To that end, we carried out a filling experiment, using labeled proteins, and showed that the proteins were evenly distributed throughout the hide and, more importantly, were bound and not removed during the washing steps. En ligne : https://drive.google.com/file/d/1JdrR84VIEwke8uLgq_S1q5y56-gIrQHe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4001 [article]

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