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Evaluation of chemical products in leather post-tanning process and their influence in presence of neutral salts in raw tannery effluent / M. V. Moreira in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 4 (04/2019)
[article]
Titre : Evaluation of chemical products in leather post-tanning process and their influence in presence of neutral salts in raw tannery effluent Type de document : texte imprimé Auteurs : M. V. Moreira, Auteur ; Everton Hansen, Auteur ; G. Giacomolli, Auteur ; F. D. P. Morisso, Auteur ; P. M. Aquim, Auteur Année de publication : 2019 Article en page(s) : p. 108-117 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chlorure de sodiumLe chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin.
On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na).
Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène.
Chromatographie par échange d'ions
Eaux usées -- Analyse
Post-tannage
Produits chimiques
Spectroscopie d'absorption
Sulfate de sodiumLe sulfate de sodium est un composé chimique courant formé d'un ion sulfate et de deux ions sodium. Lorsqu'il est anhydre, il prend l'apparence d'un solide cristallin blanc de formule chimique Na2SO4. La forme déca-hydratée, Na2SO4·10H2O, est connue sous le nom de sel de Glauber ou mirabilite. Parmi un grand nombre d'usages différents, les principales utilisations du sulfate de sodium concernent la fabrication des détergents et dans le procédé de Kraft de traitement de la pâte à papier. La moitié environ de la production mondiale provient de l'extraction de la forme naturelle décahydratée, et l'autre moitié de productions secondaires dans des procédés de l'industrie chimique.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the leather industry, several chemical products are used for the transformation of the raw hide into the demanded final product. The production flow and the post-tanning of wet-blue leathers may vary according to the available technologies and the type of final item produced. Previous operations and processes are also relevant, particularly the steps of unhairing-liming and tanning process. During the effluent treatment process, there is a great difficulty in removing soluble salts, such as sodium chloride and sodium sulfate in conventional effluent treatment stations. These salts might compromise the biological treatment of tannery wastewater and adversely impact the receiving water bodies, causing environmental pollution. Further, the presence of chlorides and sulfates might interfere in the implementation of the bath reuse system or in the recycling of the treated effluents in the post-tanning process. Therefore, this work aims to investigate the measures used to control the production of sodium neutral salts, such as the sodium chlorides and sulfates, contained in the chemical compounds uses in the industry that performs post-tanning in bovine wet-blue leather, mostly for automotive and furniture upholstery. The work was carried out following the production of the factory for six months, with approximately 1485 whole wet-blue leathers being processed per day, with an average production of 7500 m² of crust leathers per day. The work methodology was based on the diagnosis of the initial situation of the tannery, chemical analyses of the supplies employed and in proposals of action based on this initial profile. The work also involves the checking of the water consumption and the evaluation of the residual baths. The identification of the chemical products in the formulation that contribute directly to the presence of neutral salts in the gross effluent and their presence in the residual baths were among the main results observed in the present work. In order to determinate sodium, chlorides and sulfates, two methodologies were tested (ion chromatography, for chlorides and sulfates ; and absorption spectroscopy, for sodium), showing similar results. Note de contenu : - EXPERIMENTAL : Gathering of production data - Identification and characterization of the main chemical supplies used - Characterization of the critical chemical products regarding the presence of neutral salts - Characterization of the residual baths and water consumption measurements
- RESULTS AND DISCUSSION : Production data - Chemical supplies used in the formulations - Characterization of the critical chemical products regarding the presence of neutral salts - Water consumption - Characterization of the residual bathsEn ligne : https://drive.google.com/file/d/1eNSGuiZwOEvPyZjfpTvEoYbVILy5-ADX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32272
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 4 (04/2019) . - p. 108-117[article]Réservation
Réserver ce documentRemoval of anionic dye from tannery wastewater using peanut shell waste as a biosorbent / Samantha Feron de Moraes in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 1 (01/2023)
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Titre : Removal of anionic dye from tannery wastewater using peanut shell waste as a biosorbent Type de document : texte imprimé Auteurs : Samantha Feron de Moraes, Auteur ; Patrice Monteiro de Aquim, Auteur ; Bethania Brochier, Auteur ; Amanda Gonçalves Kieling, Auteur ; Everton Hansen, Auteur Année de publication : 2023 Article en page(s) : p. 42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants
Caractérisation
Colorants -- Elimination
Colorants acides
Coque d'arachide
Cuir synthétique
Eaux usées -- Analyse
Eaux usées -- Epuration
Eaux usées -- Teneur en colorants
Essais (technologie)
StatistiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Contamination of water bodies by organic substances, such as dyes, cause impacts on the environment and human health. Furthermore, the search for environmentally appropriate destinations for solid waste, such as those from agro-industries, has been intensifying, to minimize the impact of the growing generation of waste as a result of population growth. Thus, this work aimed to evaluate the use of raw peanut shells as an alternative adsorbent for the removal of Brown acid dye from synthetic leather dyeing wastewater. The peanut shells were milled and sieved. The material was characterized by Fourier Transform Infrared Spectroscopy. The parameters evaluated in the adsorption tests were pH, contact time, and mass of adsorbent material. The maximum adsorption capacity verified for the peanut shell was 7.753 mg/g and up to 93% of the dye was removed. The best adsorption conditions were at pH 2.5, 10 minutes, and adsorbent mass of 0.3 g in 50 mL of effluent. The results showed relevant removal of the Brown acid dye by the peanut shells’ adsorbent material. Note de contenu : - EXPERIMENTAL : Preparation of peanut shells - Analysis of peanut shells by Fourier Transform Infrared spectroscopy - Preparation of synthetic wastewater containing dye - Adsorption experiments - Statistical analysis
- RESULTS AND DISCUSSION : Analysis of peanut shells by Fourier Transform Infrared spectroscopy - Adsorption experiments
- Table 1 : Removal efficiency and sorption capacity of dyes by peanut shellDOI : https://doi.org/10.34314/jalca.v118i1.6414 En ligne : https://drive.google.com/file/d/1_W8sxqmpNw3ySEwGZPgzZjYt_hY9Ph-K/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39163
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 1 (01/2023) . - p. 42[article]Réservation
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