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Efficient salt recovery and total dissolved solids reduction in leather processing / Vasudevan Preethi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 117-122 Titre : Efficient salt recovery and total dissolved solids reduction in leather processing Type de document : texte imprimé Auteurs : Vasudevan Preethi, Auteur ; Praveen Kumar Sehgal, Auteur ; R. Ramesh, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2006 Article en page(s) : p. 117-122 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A major portion of total dissolved solids (TDS) in leather processing is contributed by common salt (sodium chloride) coming into the effluent during soaking of salt preserved raw hides and skins. If we can prevent or reduce the common salt going into water in the soaking operation, then TDS contributed by sodium chloride can be reduced considerably. TDS reduction is feasible when preserved skins are shaken intermittently in a saturated brine solution. The salt present in the preserved skins is removed and settles to the bottom of the saturated brine solution. The removed salt (from skin) is collected after decantation of the saturated brine solution. The collected salt is washed with fresh saturated brine solution and dried. It can be reused for preservation of skins. The contaminated saturated brine solution is regenerated and recycled again for the next operation. En ligne : https://drive.google.com/file/d/1RzN1VAb8-QDDrSzwpWts4KZvLIhGtmaN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4014 [article]

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Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes / Olcay Tünay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 123-131 Titre : Residual cod reduction in biologically treated leather tanning effluents by advanced treatment processes Type de document : texte imprimé Auteurs : Olcay Tünay, Auteur ; Z. Berker Yelmez, Auteur ; Tugba Olmez, Auteur ; Isik Kabdasli, Auteur Année de publication : 2006 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Biological treatment of effluents from industrial wastewaters often requires further treatment to comply with discharge standards. In this paper, an advanced oxidation processes and activated carbon adsorption were applied. Direct ozone reaction provided 70 % COD reduction. A readily oxidizable part of the substrate was defined. Catalytic ozone oxidation using ferric chloride proved to be very effective. Oxidation by ozone at pH 13 was fast and resulted in complete mineralization. The efficiency of O3/H2O2 system was dependent on O3/H2O2 ratio and at 1 mol/l mol ratio a better COD reduction than that of ozone alone was obtained. A kinetic equation was derived for the slower part of O3/H2O2 (1 mol/ 1 mol ) oxidation. Adsorption experiments were conducted using powdered and granular carbon. The time to attain the equilibrium was found to be long and COD removal efficiencies were below 25%. Use of powdered activated carbon in combination with an activated sludge process was recommended. En ligne : https://drive.google.com/file/d/161ZXVE48oUmEIbnGcUXwuIGSD4Mvvzhk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4015 [article]

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Lubrication of leather with mixtures of polyethylene glycol and oil / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 132-139 Titre : Lubrication of leather with mixtures of polyethylene glycol and oil Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2006 Article en page(s) : p. 132-139 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Moisture loss due to humidity decreases in the surrounding environment can result in area shrinkage, and therefore area yield. In addition, adequate moisture content is essential to the physical properties of leather, such as softness and mechanical strength. One of the problems, however, associated with leather quality is that traditional lubricants ("fatliquors," consisting of oils and surfactants) do not promote the retention of essential moisture, making the leather fibers prone to over-drying. We have recently developed a formulation of lubricants that consists of a mixture of oils and low molecular weight polyethylene glycol (PEG). Leather treated with PEG mixtures showed increased moisture retention due to the humectant effect of PEG on the leather fibers. We also characterized the lubrication of samples using an acoustic emission technique. The samples without any lubricants showed twin peaks on the plot of hit rate versus time. This implied that a non-uniform fracture occurred in the leather structure that was not lubricated. In contrast, leather lubricated with PEG and oil mixtures showed a steady increase in hit rate with time until it fractured after only one major peak of hit rate. Moreover, after the treated leather samples were heated at an elevated temperature, such as 90 °C, observations showed that the tensile strength retention of treated leather increases with PEG concentration in the fatliquoring bath. This implies that PEG increases the heat resistance of leather. En ligne : https://drive.google.com/file/d/1LwUB_V80Wd7HYM1_n0lpyRm-xGUhya6j/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4016 [article]

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Application of molecular techniques to identify bacteria isolated from the leather industry. Discussion / David Oppong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 140-145 Titre : Application of molecular techniques to identify bacteria isolated from the leather industry. Discussion Type de document : texte imprimé Auteurs : David Oppong, Auteur ; Stephen D. Bryant, Auteur ; Ravindran Rangarajan, Auteur ; Susan Steele, Auteur ; David Radwell, Auteur ; Lori Hyllengren, Auteur Année de publication : 2006 Article en page(s) : p. 140-145 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : DNA-based methods are known to be accurate, precise and rapid in identifying bacteria but there is little information about the use of these techniques in the leather industry. A study was undertaken to investigate and characterize the bacterial contaminants of fresh hides using 16S ribosomal RNA sequencing techniques. The proteolytic activities of these isolates were also studied using different substrates. Organisms belonging to 16 different genera of bacteria were isolated, and many of the species found have not been previously reported for this environment. Some of the species of bacteria being reported for the first time in the tanning environment included Janibacter terrae, Acidovorax sp., Dietzia maris, Arthrobacter pr tophormiae, Comamonas sp., Brevibacterium lutescens, Jeotgalicoccus psychrophifus, Nocardiopsis sp., Delftia acidovorans, Pseudomonas cannabina, Pseudomonas fulgida and certain species of Aeromonas and Acinetobacter. Most species of bacteria found in the incoming process water were non-proteolytic. Analysis of fresh hides revealed a large number of both proteolytic and non-proteolytic bacteria. The proteolytic bacteria included several species of Aeromonas, Proteus vulgaris, and Shewanella putrefaciens. Pseudomonas sp. were common but not all of them showed proteolytic activity. Knowledge about the identities and proteolytic activities of these organisms that occur in this environment would provide a better way to design programs to control theirundesirable activities. En ligne : https://drive.google.com/file/d/1W6m6QBqQgEHmOjGdvy_Z9dJA7dyTqpd0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4017 [article]

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