Biotechnological sequestering of chromium (III) from post-tanning effluents : first results / J. Lalueza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 7 (07/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 7 (07/2010) . - p. 214-221 Titre : Biotechnological sequestering of chromium (III) from post-tanning effluents : first results Type de document : texte imprimé Auteurs : J. Lalueza, Auteur ; A. Rius, Auteur ; Rita Puig, Auteur ; E. Martin, Auteur ; N. Rodriguez, Auteur ; R. Amils, Auteur Année de publication : 2010 Article en page(s) : p. 214-221 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Effluents  post-tannage'  Chrome(III)  'Séquestration  biotechnologique'  'Mycètes  acidophiliques' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Heavy metals in waste waters and sludge may cause significant environmental problems, and it is known that conventional recovery technologies cannot always achieve satisfactory treatment. For example, they are inappropriate to completely recover the chromium in the case of waste waters from the tanning process. Chromium can be recovered (by precipitation) from effluents that contain high concentrations of this metal. However, effluents from the later stages in present day tanning process often have a low concentration of chromium that cannot be recovered and is found in the sludge of the waste water treatment plant (WWTP). The aim of our research is to recover and reuse the chromium (III) from post-tanning effluents by means of a biotechnological sequestering method using acidophilic fungi. In this study, we tested acidophilic fungi capable to grow in the presence of chromium in waste waters from various stages of a real post-tanning process. When the post-tanning process was carried out on a pilot plant scale in which conventional rechroming and neutralization stages were undertaken and the use of additional chemicals was avoided, chromium (III) sequestration values of above 95% were obtained. As these results are so promising, further studies will focus on searching for more resistant fungal strains and determining which of the chemicals used in the post-tanning process can be avoided or replaced by alternatives. En ligne : https://drive.google.com/file/d/11Xp-fRfvu0SIuxRNCwV_Uehv3PSd94ho/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9720 [article]

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Salinity reduction in the production of nappa skins by using agents with non-swelling capacity in pickling/tanning / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 6 (11-12/2005) . - p. 232-236 Titre : Salinity reduction in the production of nappa skins by using agents with non-swelling capacity in pickling/tanning Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; A. Rius, Auteur ; J. Cot, Auteur ; J. Lalueza, Auteur ; Ramón Palop, Auteur ; Joaquim Font, Auteur Année de publication : 2005 Article en page(s) : p. 232-236 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- teneur en chrome Cuir nappa Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de moutons Humidité -- Absorption:Eau -- Absorption Photostabilité Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Post-tannage sels -- Réduction Sels de sodium Température de retrait Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In earlier papers, we studied the behaviour in the pickling/tanning processes of hides1,2 and sheepskins3,4 of four commercial non-swelling products. The application of these products yielded a significant reduction in salinity. In the case of sheepskins, the best results in terms of non-swelling capacity, shrinkage temperature, conductivity and Chemical Oxygen Demand of the residual baths corresponded to the pickling treatments carried out at a salinity of 2°Bé with a 2% offer of naphtol 3-6 disulphonic acid, or with a 2% offer of p-hydroxydiphenyl sulphonic acid, or with a 4% offer of polyacrylic acid. Note de contenu : - AIM OF THE WORKS - EXPERIMENTAL PROCEDURES : Starting material. Pickling and tanning operations - Post-tanning process - RESULTS : Chromium content and shrinkage temperature after tanning - Organoleptic properties - Physical properties - Water absorption - Light fastness - Concentration of chlorides and other water-soluble substances - - Table 1 : Processes carried out after bating (offers on delimed weight) - Table 2 : Recipe for clothing nappa (offers on wet-blue weight) - Table 3 : Recipe for footwear nappa (offers on wet-blue weight) - Table 4 : Mean values of physical testing for clothing nappa. Standard deviation in brackets - Table 5 : Mean values of physical testing for footwear nappa. Standard deviation in brackets - Table 6 : Mean values of water absorption after 12 hours. Standard deviation in brackets - Table 7 : Concentration of water-soluble substances in clothing nappa - Table 8 : Concentration of water-soluble substances in footwear nappa En ligne : https://drive.google.com/file/d/1SOT5OcUJQ3aU62g_UIWKYAA2p6FwE4HM/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39212 [article]

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