Enzyme unhairing of skins in recycled liquors - A way to utilize the waste bath / Jian Song in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 6 (11-12/2012)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 6 (11-12/2012) . - p. 250-255 Titre : Enzyme unhairing of skins in recycled liquors - A way to utilize the waste bath Type de document : texte imprimé Auteurs : Jian Song, Auteur ; Tao Wenyi, Auteur ; Wuyong Chen, Auteur Année de publication : 2012 Article en page(s) : p. 250-255 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bain de trempe -- Recyclage Cuirs et peaux Epilage enzymatique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the leather industry, pollution is a serious problem. Moreover, unhairing is a heavy pollution process and the utilization of enzymes in unhairing is a promising clean technology. Although there are numerous reports on enzymatic unhairing, little is known about the reuse of enzyme bath. In this paper, the recycling of the enzymatic unhairing bath was investigated. It was found that recycled liquors have little effect on the quality of finished leather. Only 46,8% of enzyme is used in the recycling process, compared with single use process. Moreover, the load of effluent is concentrated in reduced volume, that is to say, the effluent is easy to dispose. Another advantage is that the final bath whose main components are proteins can be refused as a fertilizer. Note de contenu : - MATERIALS AND METHODS : Materials - Determination of proteolytic activity - Effects of saccharide and gelatin on the activity of protease - Effect of EDTA on the conservationof the spent liquor - Preparation of pigskins - Conventional enzymatic unhairing without recycling - Enzymatic unhairing with the recycling - Assessment of the effectiveness of unhairing - Physical and mechanical properties - RESULTS AND DISCUSSION : Effects of saccharides and gelatin on the activity of protease - Effect of EDTA on the conservation of the spent liquors - Recycling of the spent liquors - Effectiveness of unhairing - Pollution load of the spent liquor - Reuse of the final spent liquor En ligne : https://drive.google.com/file/d/1TgeyYl56DNw3bcdGEq2wxafmk2L8Df7V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16809 [article]

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The recycling of silicofluoride and boric acid liquors for hide preservation / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 68 (Année 1984) . - p. 146-149 Titre : The recycling of silicofluoride and boric acid liquors for hide preservation Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur ; I. B. Leach, Auteur ; M. R. Ascough, Auteur Année de publication : 1984 Article en page(s) : p. 146-149 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bain de trempe -- Recyclage Borique, Acide Cuirs et peaux -- Conservation Fluorure de silicium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Suspension drying is a long-established method of curing hides and skins still practised today in many parts of the world, but a major disadvantage is that adverse climatic conditions can cause major Tosses. For example, in West Africa during the wet season putrefaction of hides caused by delayed drying is extensive. Barrette reviewed bactericidal chemicals potentially suitably for treatment of hides and skins prior to drying to avoid this problem and selected methods were evaluated in field trials in the Gambia in 1981. The immersion of cattle hides in a saturated solution of either sodium silicofluoride (SSF) or boric acid for 60 min after flaying and fleshing prior to conventional suspension drying was found to give effective protection against putrefaction during drying periods of up to six days. No adverse effects on leather-making qualities of the raw stock could be attributed to the bactericidal pre-treatments. A practical system for pre-treating hides with bactericides will benefit from recycling of dip liquors to achieve economy in chemical usage. This paper describes experiments carried out in the Gambia in 1982 to investigate the scope for recycling SSF and boric acid liquors for hide preservation. Experiments were also carried out to investigate the scope for reducing the period of immersion of hides while retaining effective preservation. Note de contenu : - Raw material - Preliminary experiments on reduced treatment time - Experiments on receiving unreplenished bactericide liquors : Results with SSF - Results with boric acid - Experiments on recycling replenished SSF liquors - Investigation of the "exhaustion" of recycled SSF liquors - Table 1 : Assessment of hide quality in unreplenished SSF liquor recycling experiments - Table 2 : Assessment of hide quality in unreplenished boric acid liquor recycling experiments - Table 3 : Assessment of hide quality in unreplenished boric acid liquor recycling experiments En ligne : https://drive.google.com/file/d/1xqamOshukt7PNwdxPWvhdu4ixPXuqhni/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34151 [article]

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