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Application of protein hydrolysate from chrome shavings for polyvinyl alcohol-based biodegradable material / Martina Kresalkova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 4 (04/2002)
[article]
Titre : Application of protein hydrolysate from chrome shavings for polyvinyl alcohol-based biodegradable material Type de document : texte imprimé Auteurs : Martina Kresalkova, Auteur ; Karel Kolomaznik, Auteur ; J. Kupec, Auteur ; L. Hnanickova, Auteur Année de publication : 2002 Article en page(s) : p. 143-149 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of hydrolysate from chrome-tanned wastes for producing biodegradable plastics particularly applicable in agriculture requires management of the breakdown of modified compounds of synthetic polymers. In this work, the additive applied for this purpose was protein hydrolysate produced by enzymatic hydrolysis of chrome-tanned shavings. It was used for modifying polyvinyl alcohol which had been processed into water-soluble films often employed in agriculture. This material, after being deposited in soil, undergoes biological degradation (first of all anaerobic) which is supported to a large extent by the addition of protein hydrolysate in particular. For this reason, anaerobic biodegrability tests were performed (volumetric test determining methanogenic activity) and the corresponding percentage of degradation was determined based on a balance of produced biogas and inorganic carbon in the aqueous phase. Polyvinyl alcohol is relatively poorly degradable under aerobic conditions while protein hydrolysate, on the contrary, undergoes biodegradation at a fairly fast rate. From a comparison between the attained degradation degree of blow-extruded film and that of mechanically prepared compounds it follows that the limiting factor of degradability, apart from added protein hydrolysate, is also a chemical reaction between polyvinyl alcohol and hydrolysate taking place during the heat processing of film. It was confirmed that protein hydrolysate from chrome shavings markedly increases biodegradation of material (depending on its content in the plastic matrix), reduces the final cost of product and, last but not least, to some extent also exerts a positive influence on mechanical properties of the film. En ligne : https://drive.google.com/file/d/1DG9POYCMMG1n3uWy8vr5u2otxOhr9-u2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4312
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 4 (04/2002) . - p. 143-149[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001573 - Périodique Bibliothèque principale Documentaires Disponible The effect of anaerobic digestion on chrome sludge - A by - product of tanned leather waste / Nabanita Saha in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 7 (07/2003)
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Titre : The effect of anaerobic digestion on chrome sludge - A by - product of tanned leather waste Type de document : texte imprimé Auteurs : Nabanita Saha, Auteur ; Karel Kolomaznik, Auteur ; Lubomir Saha, Auteur ; Martina Kresalkova, Auteur Année de publication : 2003 Article en page(s) : p. 256-262 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The leather industry is environmentally important as a user of a by-product of the meat industry. It is perceived as a consumer of resources and a producer of pollutants. The most serious problem is chrome tanned solid wastes, which are now under control through alkali-enzymatic hydrolysis treatment of chrome shavings. The main products of this hydrolytic reaction are gelable protein hydrolysate, enzymatic hydrolysate, and chrome sludge. In chrome sludge, the rest of the biomaterial is collagen protein. Approximately 20-40 % (on free moisture basis) is strongly bound as co-ordinate complex with chromium, which creats serious problems for further treatment of it to recover tanning salt. One possible solution is to decrease the content of collagen protein by anaerobic digestion, which is presented in this paper. The effect of anaerobic digestion on chrome sludge was observed under controlled conditions using different fermentation compositions of broth at 50°C for a 15 day incubation period. Sludge, inoculum and water at 3:1:1 ratio was determined to be the optimum fermentation composition from the bioconversion point-of-view. During anaerobic digestion, the content of biomaterial associated with the chrome sludge decreased while the quantity of free chromium increased. These observations were confirmed by attenuated total reflectance (ATR) using FTIR spectophotometric and scanning electron microscopic (SEM) analysis. En ligne : https://drive.google.com/file/d/1d3tHTWq3kcPMSWrvM8T_ii0mDUt2Vs7o/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4143
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 7 (07/2003) . - p. 256-262[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001589 - Périodique Bibliothèque principale Documentaires Disponible