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Adsorption performance of activated carbon from leather buffing waste / J. D. Putshak'a in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 10 (10/2010) . - p. 313-319 Titre : Adsorption performance of activated carbon from leather buffing waste Type de document : texte imprimé Auteurs : J. D. Putshak'a, Auteur ; I. O. Akpabio, Auteur Année de publication : 2010 Article en page(s) : p. 313-319 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An adsorption study was carried out with powdered activated carbon (PAC) prepared from leather buffing waste by steam activation after carbonization at temperatures between 500–800°C. Adsorption performance of each activated carbon test was carried out using methylene blue, a medium sized dye molecule commonly used to determine adsorption efficiency of adsorbents. The results obtained reveal an increase in adsorption of methylene blue with decrease in temperature of carbonization indicating that lower temperature of carbonization yields carbon with greater adsorption capacity. Also, this suggests that carbonization at temperatures below 500°C may be preferred. The carbon had adsorption capacity of 90.4mg/L of a solution containing 100mg/l of the dye. The effect of time and carbon dosage on adsorption indicates that activated carbon from leather buffing waste is competitive with the reference carbon indicating it can be used to adsorb dyes, decolorize organic compounds and treat waste water. Data corresponding to the adsorption of methylene blue onto the best activated carbon produced (BD5) using the Freundlich and Langmuir adsorption isotherm model established a fit with an R2value of 0.915 and 0.989 respectively. En ligne : https://drive.google.com/file/d/1IL4pDWr4YEr0cjkiEshE60h1scsDoMIO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10514 [article]

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Examination of bacterial populations in salt, salted hides, soaked hides and soak liquors / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 10 (10/2010) . - p. 320-326 Titre : Examination of bacterial populations in salt, salted hides, soaked hides and soak liquors Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; Meral Birbir, Auteur Année de publication : 2010 Article en page(s) : p. 320-326 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study was performed to evaluate the efficiency of salt curing and soaking methods containing antibacterial agents. The bacteria adversely affecting hide quality because of hide preservation method and soaking process were examined in salt (n=40), salted hide (n=36), soaked hide (n=34) and soak liquor (n=19) samples obtained from different tanneries in Leather Organized Tannery Region, Tuzla-?stanbul, Turkiye. Most of the hides examined in this study (83%) were imported from abroad. The pH, moisture content %, ash content % and salt saturation % of the salted hides were determined. In the salted hides, the pH values of all samples (pH 6–9) and moisture content (49–66%) in 28% of the samples were found to be appropriate for bacterial growth. It was determined that ash content in 25% (10–14%) of the salted hides and salt saturation in 22% (65–84%) of the salted hides were suitable for the growth of mesophilic bacteria. Despite the salt-curing of hides, proteolytic and lipolytic mesophilic bacteria were isolated from the hides in high numbers. Proteolytic and lipolytic extremely halophilic bacteria were observed in the most samples of salt and salted hides. These bacterial counts were 102–104 c.f.u./g in the salt samples whereas they were 102–106 c.f.u./g in the salted hides. Although proteolytic and lipolytic mesophilic bacteria were 105–108 c.f.u./g in 97% of the soaked hide samples, they were 105–106 c.f.u./ml only in 42% of the soak liquors. In conclusion, it was determined that this hide preservation method was not adequate to inactivate bacterial activity. Hence, bacterial activity was high in the salted and soaked hides and also the concentration of antibacterial agents used in the soaking process was not sufficient. It is believed that eliminating of these problems will provide to increase hide quality. En ligne : https://drive.google.com/file/d/1650X8nvuhnZu1ubObPCd-z9-IlqEiojQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10515 [article]

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Economic aspects of biodiesel production from tannery waste fats / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 10 (10/2010) . - p. 327-333 Titre : Economic aspects of biodiesel production from tannery waste fats Type de document : texte imprimé Auteurs : Karel Kolomaznik, Auteur ; Jiri Pecha, Auteur ; Michaela Barinova, Auteur ; Lubomir Sanek, Auteur Année de publication : 2010 Article en page(s) : p. 327-333 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The present high price for biodiesel results from the high prices of it’s main feedstock—soybean (USA) and canola oil (Europe). The potential profit from the utilization of low cost tannery fat wastes for biodiesel production depends on the processing costs of the pre-treatment technology; which includes their refining and esterification of free fatty acids. A suitable ratio of tetramethylammonium hydroxide, which is used as an alkali esterification agent of free fatty acids and simultaneously as a transesterification catalyst, enables making biodiesel production from tannery waste feedstock economically profitable. Optimization of the pre-treatment technology is presented using a proposed mathematical model. The final biodiesel properties can be improved by its production from the blends of the waste fats with waste oils. En ligne : https://drive.google.com/file/d/1LrDlEJlR1OzrojCNnSo7rHSTzxQ4ow7-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10516 [article]

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Study of the effect of temperature, relative humidity and UV radiation on wet-white leather ageing / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 10 (10/2010) . - p. 334-341 Titre : Study of the effect of temperature, relative humidity and UV radiation on wet-white leather ageing Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; Mireia Cobos, Auteur ; Joaquim Font, Auteur ; Joan Jorge, Auteur ; Lluis Ollé, Auteur Année de publication : 2010 Article en page(s) : p. 334-341 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since upholstery leather is considered a very high-tech product, a long service life is expected by the costumer. However, this type of leather can undergo extreme environmental conditions that may cause premature ageing. This work deals with the study of the effect of temperature, relative humidity, and UV radiation on leather ageing. Leathers with wet-white tannage were exposed to weathering effects using a climatic chamber in order to identify the most important variables affecting this weathering process and to check for interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) have been employed as statistical tools for estimating the effects of the parameters. En ligne : https://drive.google.com/file/d/1nrfajfQj0WFqM3UJji2BHKv9aaNpTX6D/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10517 [article]

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