Characterization of raw wastewater from tanneries / Mariliz Gutterres in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 6 (11-12/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 6 (11-12/2015) . - p. 280-287 Titre : Characterization of raw wastewater from tanneries Type de document : texte imprimé Auteurs : Mariliz Gutterres, Auteur ; Jaqueline Benvenuti, Auteur ; Juliana T. Fontoura, Auteur ; Santiago Ortiz-Monsalve, Auteur Année de publication : 2015 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cuirs et peaux -- Industrie -- Aspect de l'environnement Cuirs et peaux -- Industrie -- Brésil Eaux usées -- Analyse Eaux usées -- Stations de traitements Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Due to the constantly increasing requirements and supervisory environmental agencies concerning the release of industrial effluents into receiving waters, industries are looking to property treat their effluents and to achieve efficient removal of contaminants. The leather industry is responsible for the production of liquid effluents with high concentrations of pollutants since most of the process steps are carried out in an aqueous medium. Due to the changes in leather technologies in recent years, it is necessary to know and analyze how tannery effluents vary according to the processing steps performed in different tanneries. This may be used to plan and design unit operations in wastewater treatment plants. In order to contribute to this purpose, this study presents the characterization of raw tannery wastewater and provides and discusses an overview of effluent treatment plants and some particularities of them. The raw effluents were characterized by analysis of pH, turbidity, conductivity, chromium oxide, chlorides, total hardness, total Kjeldahl nitrogen (TKN), ammonia nitrogen, sakis (total, suspended : fixed and volatile, dissolved : fixed and volatile), five-day biochemical oxygen demand (BOD), chemical oxygen demand (COD), phosphorus and total organic carbon (TOC). The test results of the parameters for contaminants for each type of tannery are related to previous researches and discussed. Note de contenu : - LEATHER INDUSTRY AND WASTEWATER - BRAZILIAN LEATHER INDUSTRY AND WASTWATER TREATMENT PLANTS - MATERIALS AND METHODS : Tanneries and sampling - Wastewater characterization En ligne : https://drive.google.com/file/d/1GrNV99KF5Ge787qjsPGJYHsDDfwWVFqQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25100 [article]

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Damage of pickled hides, wet-blue leather and vegetable leather due to biodeterioration / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 5 (05/2015) . - p. 138-144 Titre : Damage of pickled hides, wet-blue leather and vegetable leather due to biodeterioration Type de document : texte imprimé Auteurs : Juliana T. Fontoura, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2015 Article en page(s) : p. 138-144 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Champignons microscopiques Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Essais dynamiques 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. Tannage végétal Traction (mécanique) Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fungi and bacteria can be responsible for undesirable changes in hides and leather. This study identifies some of the defects caused by fungal growth on pickled hides, wet blue leather and vegetable-tanned leather, such as stains, protein material loss, deterioration of grain layer, and modification of the physical and mechanical properties of resistance. The assessment of the samples exposed to microbiological attack was carried out through visual observation, scanning electron microscopy (SEM), tensile strength test and determination of mass loss. Leather without preservation or treated with insufficient of antimicrobial agent to prevent fungal contamination showed changes in the structure, loss of protein material, a reduction in physical and mechanical properties as well as the presence of stains that may compromise the quality of the final product. Note de contenu : - MATERIALS AND METHODS : Sample preparation - Biodeterioration process in soil - Leather tensile strength test - Stains and damage caused by fungal attack - Examination of the infected pickled hides, wet-blue leather and vegetable tanned leather sample by SEM - RESULTS AND DISCUSSION : Biodeterioration process in soil - Leather tensile strength test - Stains and damage caused by the fungal attack En ligne : https://drive.google.com/file/d/1ohbmrwCUXfBX102DlSJn3Fixx84FKxJN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24054 [article]

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Performance of antimicrobial agents for the preservation of chrome leather / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 6 (06/2016) . - p. 221-229 Titre : Performance of antimicrobial agents for the preservation of chrome leather Type de document : texte imprimé Auteurs : Juliana T. Fontoura, Auteur ; D. Ody, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2016 Article en page(s) : p. 221-229 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Adsorption Antifongiques Cuirs et peaux -- Analyse Cuirs et peaux -- Conservation Cuirs et peaux -- Lavage Tests microbiologiques Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fungal growth in leathers causes significant damages like stains, surface roughness and loss of physical-mechanical resistance. This raises the need to develop control strategies by the use of antimicrobial agents. Considering the improving processes with regard to the use of antimicrobial agents added in skins and leathers to prevent their contamination by fungi, this study aims to evaluate the performance of six antimicrobial agents conventionally used in the leather industry, against four different fungi. These agents were applied during the chrome tanning process. Accelerated microbiological assays (tests plating and incubation on tropical chamber) were performed, as well as sorption and wash-out testing of three selected antimicrobial agents by UV/VIS spectrophotometry and verification of surface biodeterioration through SEM. Antimicrobial agents 2-thiocyanomethylthio benzothiazole (TCMTB) and Aqueous dispersion of 2-n-octyl-4-isothiazolin-3-one + methyl Nbenzimidazol- 2-ylcarbamate (OIT+BMC/water) showed antifungal capacity against different fungi tested applied in concentration of 0.2% (weight leather base). In the tropical chamber test, for the five samples of wet-blue leather treated with antimicrobial agents the growth of fungus was not observed. From the antimicrobial agents subjected to sorption testing and wash out, the TCMTB based antimicrobial agent presented rapid and high sorption in wet blue leather and also has resistance to washing. Note de contenu : - MATERIALS AND METHODS : Materials and application of antimicrobial agents to leather - Plating test - Incubation in a tropical chamber - Sorption and wash out - Scanning electron microscope images - RESULTS AND DISCUSSION : Plating test - Incubation in a tropical chamber - Sorption and wash out - Scanning electron microscope studies En ligne : https://drive.google.com/file/d/1wr6V_36Odg8tKYVy7fxXCr8ixeXIZkYH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26439 [article]

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Performance of microbicides for the preservation of vegetable tanned leather / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 7 (07/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 7 (07/2016) . - p. 259-266 Titre : Performance of microbicides for the preservation of vegetable tanned leather Type de document : texte imprimé Auteurs : Juliana T. Fontoura, Auteur ; D. Ody, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2016 Article en page(s) : p. 259-266 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Formulation (Génie chimique) Produits de conservation du cuir Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the tanning industry, the deterioration of leather due to the development of fungi is of great concern. Some fungi metabolize important substances in leather, causing serious damage such as pigmented stain that is difficult to remove, defects, surface roughness, and loss of physical and mechanical resistance, which affect the quality of the final product. This work evaluated the performance of five microbicides conventionally used in the leather industry, against different fungi. Microbicides were applied during the tanning process with vegetable tannin in the fatliquoring step. Accelerated microbiological tests (plating and tropical chamber) were performed. The results revealed a low antifungal capacity of selected microbicides when applied at an offer of 0.2% (mass hide base) fungicides. Treatment with OIT+BMC/water at an offer of 0.75% showed satisfactory fungal protection against different fungi tested and proved to be the most suitable for the preservation of vegetable tanned leather. Note de contenu : - Materials and application of microbicides to leather - Accelerated microbiological tests - Plating test - Incubation in a tropical chamber - Scanning electron microscopy (SEM) - TABLES : 1. Formulation of tanning process with vegetable tannin - 2. Inhibition distance (ID) and fungal growth on the surface (FGS) after 28 days on vegetable tanned leather samples En ligne : https://drive.google.com/file/d/19V571dRsyJUQtBXny5Y332Wi4HA95uMc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26716 [article]

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