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Optimization of raw hide curing using two-component counter-current diffusion model / Michaela Barinova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 12 (12/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 12 (12/2009) . - p. 397-404 Titre : Optimization of raw hide curing using two-component counter-current diffusion model Type de document : texte imprimé Auteurs : Michaela Barinova, Auteur ; Karel Kolomaznik, Auteur ; Vladimir Vazek, Auteur ; Ján Matyasovsky, Auteur ; Peter Jurkovic, Auteur Année de publication : 2009 Article en page(s) : p. 397-404 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Curing with concentrated brine solution (sodium chloride) is a common method for raw hide preservation. Sodium and chloride ions diffuse towards the raw hide inner volume, which initiates the counter-current transport of water from the raw hide inner volume. The result of the two-component counter-current diffusion is increasing salt content and decreasing water content in the raw hide inner volume. For optimization of the curing process it is necessary to determine the time dependence of the brine concentration from the hide surface towards its center, it means the non-stationary concentration field in the inner volume of the hide. For this reason we have proposed a mathematical-physical model for NaCl diffusion in the hide. We have also carried out the numerical solution of the model; the solution comprises the concentration fields of sodium chloride and water during the curing process. The respective effective diffusion coefficients and their dependence on brine concentration have been determined experimentally. The result of the mathematical simulation and mathematical evaluation of the experimental data was estimation of the optimal time for raw hide curing at the given boundary conditions, and a sufficient brine concentration in the inner volume of the hide. En ligne : https://drive.google.com/file/d/1-rtLVjuO-XDEItsdI8_r3XHPuKPP7YIx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7429 [article]

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Studies on the use of enzymes in tanning process : Part I. High exhaust vegetable tanning / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 12 (12/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 12 (12/2009) . - p. 405-415 Titre : Studies on the use of enzymes in tanning process : Part I. High exhaust vegetable tanning Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; P. Ramesh Kannan, Auteur ; N. Usharani, Auteur ; Gladstone Christopher Jayakumar, Auteur ; Arjunan Yasothai, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2009 Article en page(s) : p. 405-415 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the present investigation, an attempt was made to design an eco-friendly vegetable tanning process without pickling process by the application of enzymes to improve the exhaustion of vegetable tannins. Such an approach has resulted in more than 97% tannin exhaustion in the case of the experimental process, an increase of 12% compared with the conventional vegetable tanning process. The tanned leathers showed an improvement in hydrothermal stability, surface color values and there is no surface deposition of tannins in the experimental leathers, although vegetable tanning was carried out at higher pH. This was substantiated through scanning electron microscopic analysis that resulted in opened up, split compact fiber structure that was well coated by tannins, indicating that the enzyme assisted tanning process did not bring about any major change or destruction on the fiber structure of the leathers. The enzyme assisted tanning process is efficient in terms of improved quality of leather and also led to reduction in total solids (TS), chlorides and COD loads. The enzyme assisted tanning system presented here appears to be a viable option for combating pollution arising from the conventional vegetable tanning system. En ligne : https://drive.google.com/file/d/1iw2VRewyhADrO0ti5LQ3pHM9NjRvXzHH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7430 [article]

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Studies on the use of sesuvium portulacastrum - Part III : Phytoremediation of salt contaminated soils of tannery wastewater discharged lands / P. Ramesh Kannan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 12 (12/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 12 (12/2009) . - p. 416-422 Titre : Studies on the use of sesuvium portulacastrum - Part III : Phytoremediation of salt contaminated soils of tannery wastewater discharged lands Type de document : texte imprimé Auteurs : P. Ramesh Kannan, Auteur ; S. Deepa, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2009 Article en page(s) : p. 416-422 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather processing industry is known to be associated with the generation of liquid waste with high total dissolved solids (TDS), in particular salinity. In part I of the present study, S. portulacastrum was used for accumulation of NaCl present in tannery wastewater and in part II of the work, the harvest plant was reused for preservation of hides and skins. In the present investigation, S. portulacastrum is being used as a phytoremediant for the removal of NaCl in tannery wastewater discharged open lands containing TDS levels of 12,300 ppm for a period of 15 months (April 2008 – June 2009), at pilot scale in a commercial site in Tamilnadu state of India. The TDS levels of the soil in terms of NaCl were reduced from 12,300 to 2700 ppm by harvesting Sesuvium portulacastrum for 15 months. An average of 77% of Na+ and 63% of Cl- was absorbed by the plants during the fifteen months of harvesting. Maximum accumulation of Na+ and Cl- was observed during the month of August’08 and minimum level of absorption resulted during the period September’08 to December’08. The phytoremediation capacity of the plant was dependent on the climatic conditions. The lower values of salt absorption are attributed to heavy rainfall in these regions resulting in lower availability of salt for accumulation by the plant. The results of the present work indicate that S. portulacastrum can be used for phytoremediation of sodium chloride contaminated soils of tannery wastewater treated lands. En ligne : https://drive.google.com/file/d/1VD7fTQrE1E4IROR7Q0cIfqPDqgdaHduN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7431 [article]

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