Minimization of industrial wastes-adding value to collagenic : Adding value to collagenic materials procter memorial lecture / J. Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 3 (05-06/2003) . - p. 91-97 Titre : Minimization of industrial wastes-adding value to collagenic : Adding value to collagenic materials procter memorial lecture Type de document : texte imprimé Auteurs : J. Cot, Auteur ; Agusti Marsal, Auteur ; Albert M. Manich, Auteur ; Pedro J. Celma, Auteur ; Rigoberto Choque, Auteur ; Luisa F. Cabeza, Auteur ; L. Labastida, Auteur ; J. Lopez, Auteur ; J. Salmeron, Auteur Année de publication : 2003 Article en page(s) : p. 91-97 Langues : Anglais (eng) Catégories : Agents de tannage Chrome trivalent Colorants Cuirs et peaux -- Déchets Déchets -- Réduction Huiles et graisses Polyacryliques Polyuréthanes Statistiques Tannage -- Déchets Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Our research is in the area of minimisation of industrial waste in the leather industry. This contribution is concerned with the processing of chromed collagen residues produced at each of the different stages of production. These are : - group I : chromed residuals - tanning and drying stage - crust state - group II : chromed residuals + fatty matter - fatliquoring stage - group III : chromed residuals + fatty matter + retanning agents - retanning stage - group IV : chromed residuals + fatty matter + retanning agents + dyestuff - dyeing stage - group V : chromed residuals + fatty matter + retanning agents + dyestuff + acrylic and /or polyurethanes - finish stage Group V residues represent the highest percentage of the total volume of residues and they are also the most complex. The group includes the trimmings from industrial manufacturers of leather products such as footwear, clothing and upholstery. Chromed collagen residues are those stabilised or crosslinked with chromium (III) salts which block any later treatment to obtain gelatine using conventional methods. A large part of this type of residue is used for the production of agglomerates known as regenerated leather, mixing with latex in dutch-piles, from which various articles are manufactured. Note de contenu : - STASTISTICAL TREATMENT OF THE RESULTS : Experimental design - EVOP design - The relationship between NaOH concentration, temperature and Bloom degree - Inclusion of the effect of temperature and of time on the Bloom degree - INDUSTRIAL APPLICATION - Table A : Variable levels of the box and hunter design - Table B : Experimental plan randomly ordered - Table C : First EVOP cycle design to explore the optimum Bloom zone : H2O2 remained constant at 1 mL - Table D : Second EVOP cycle design to explore the optimum Bloom zone : H2O2 remained constant at 1 mL - Table E : Experiments used to explore the functional relationship between the NaOH concentration and Bloom degree En ligne : https://drive.google.com/file/d/1ZN4xdrByWrdVJUfF_R7kUw77M4hKfcNs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39781 [article]

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Systematic analysis of material fluxes at tanneries / C. Konrad in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 1 (01-02/2002) . - p. 18-25 Titre : Systematic analysis of material fluxes at tanneries Type de document : texte imprimé Auteurs : C. Konrad, Auteur ; K. E. Lorber, Auteur ; R. Mendez, Auteur ; J. Lopez, Auteur ; M. Muñoz, Auteur ; D. Hidalgo, Auteur ; C. Bornhardt, Auteur ; M. Torres, Auteur ; B. Rivelca, Auteur Année de publication : 2002 Article en page(s) : p. 18-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Cuirs et peaux -- Déchets Cuirs et peaux -- Industrie Eau -- Consommation Eaux usées Tannage au chrome Travail de rivière (cuir) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The process of transforming animal skin to leather is characterised by a large consumption of fresh water and the generation of a high quantity of solid waste. As a consequence of the high water consumption tanneries are responsible for a huge quantity of waste water containing chromium, suphide and/or organic matter. In developing countries where treatment of solid waste and waste water treatment is not state of the art, tanneries cause a serious negative environment impact. Systemising the material fluxes at a tannery in order to provide rules of thumb for estimating their impact and developing pollution prevention opportunities is difficult. Nonetheless such an attempt is made in this paper. The data deriving from input/output-analyses which were carried out at 5 different tanneries (3 Chilean, 1 Spanish and 1 Ecuadorian) were concentrated to generalised material streams of two idealised tanning processes. Scenario 1 is a conventional chromium-tanning process with the splitting stage in the beamhouse and paddle technology in the beamhouse. To transform 1 ton of wet salted hides (all data in this paper are based on 1 t wsH) into 500 kg product (grain- and split-leather and wet-blue) 63 m3 of fresh water and 442 kg of chemicals are required. 58 m3 of effluent and 696 kg of solid waste are generated. Scenario 2 describes a chromium-tanning process with splitting in the tanyard (wet-blue stage) and drum technology applied in the beamhouse. By these two changes the water consumption and solid waste generation could be reduced significantly. Per ton wet salted hides, 55 m3 fresh water and 442 kg chemicals are consumed. 50 m3 of waste water and 477 kg solid waste are generated. At each tannery a high potential for reducing water consumption and solid waste generation was detected. However, the figures presented in this paper describe the prevailing situation at most tanneries. Implementation of the pollution prevention and recycling measures suggested by the INCO-DC "EILT" working groups will still take time and will depend on the impact of legal restrictions and an active interest in reducing environmental impact. Note de contenu : - Results and discussion : Generalised flow sheet of the tanning process - Input/output data : Waste water generation - Solid waste generation - Generalised input/output data - Table 1 : Acronyms of Universities and corresponding tanneries En ligne : https://drive.google.com/file/d/1NGubxoC6qlI_pa7uRnxC14TIkwQtRqmf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40192 [article]

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