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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)
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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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9720
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 7 (07/2010) . - p. 214-221[article]Réservation
Réserver ce documentRecovery of organic nitrogen from beamhouse wastewater in a hair recovery process / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)
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Titre : Recovery of organic nitrogen from beamhouse wastewater in a hair recovery process Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Joaquim Font, Auteur ; A. Rius, Auteur ; M. Reyes, Auteur ; Sara Cuadros, Auteur ; E. Bautista, Auteur Année de publication : 2009 Article en page(s) : p. 176-182 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the leather industry, in addition to the extrinsic contamination attribuable to chemical products not absorbed by the hides, there is intrinsic contamination produced by the hides themselves. from each 100 kgs of raw material, 15 kgs of solubilised protein will end up in wastewater in the early stages of the process of transforming hides into leather. These proteins contain nearly 18% of nitrogen. In this study it is proposed to recover organic nitrogen from the proteins present in the effluents of the beamhouse operations of hides and the subsequent revalorization of the protein fraction obtained.
This work seeks to characterize (the chemical oxigen demand (COD), total nitrogen, ammonium nitrogen, total soluble nitrogen, particulate nitrogen, organic nitrogen and protein) the wastewaters, individually or in groups, of the various beamhouse operations (soaking, unhairing-liming, washing, conditioning, deliming, bating, washing and pickling) with hair recovery.
The studies are presented of the determination of the pH value (adjusted by means of buffers of acetic acid/sodium acetate) at which the greatest precipitate of the protein fraction if produced. In addition, the following tests were performed to characterize these precipitates : determination of the quantitative composition of the main components of the protein fraction (humidity, proteins, free amino acids, fats and other matter soluble in dichloromethane and ash) ; heavy metals content, calcium, magnesium, potassium and sodium and the composition in total amino acids with prior acid hydrolysis of the protein fraction with 6N hydrochloric acid.En ligne : https://drive.google.com/file/d/15jtZl0drv7WDsFm3P8MYIps2ch5NYQcV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6276
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 176-182[article]Réservation
Réserver ce documentSalinity 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)
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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
PicklageLe 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 retraitIndex. 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 nappaEn ligne : https://drive.google.com/file/d/1SOT5OcUJQ3aU62g_UIWKYAA2p6FwE4HM/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39212
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 6 (11-12/2005) . - p. 232-236[article]