Assessment of carbon contribution to the East Kolkata Welland Ecosystem (Ramsar Site: 1208) by leather producing units of the Calcutta Leather Complex : Part I / Sudin Pal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 1-7 Titre : Assessment of carbon contribution to the East Kolkata Welland Ecosystem (Ramsar Site: 1208) by leather producing units of the Calcutta Leather Complex : Part I Type de document : texte imprimé Auteurs : Sudin Pal, Auteur ; Buddhadeb Chattopadhyay, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2015 Article en page(s) : p. 1-7 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bilan des émissions de gaz à effets de serre Cuirs et peaux -- Industrie -- Inde Dioxyde de carbone Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the context of addition of carbon to East Kolkata Wetland (EKW) ecosystem, an attempt has been made to provide a comprehensive computation of carbon input by raw hides-skins and different chemicals ; and carbon output by various solid and liquid waste from the leather industry. The calculations are based on the conventional operations of nine tanneries of which three produce bag leather, three gloves and three shoe uppers. The amount of carbon that enters into the leather industry depends upon the selection of raw hides and skins, percentage of chemicals used and purity of chemicals. ln case of bag leather and shoe upper manufacturing units the carbon value changes depending on the tannery specific finishing recipe, spray types and number of coats. Besides this the carbon value also changes with the customeris required finish. Whereas the carbon value of solid and liquid wastes changes depending upon the carbon input, mechanical operations and the binding of chemicals with hides and skins. The analysis of large samples from nine selected tanneries has permitted us to calculate that 396.1 ± 11.67kg carbon are present in one tonne raw cattle hides or skins. The processing of this one tonne cattle raw hides and skins results in 65.54 ± 13.06kg carbon being incorporated with chemicals and, from which 320.75 ± 16.37kg of carbon are discharged in the EKW area through different solid and liquid wastes. The tannery agglomerates at the Calcutta Tannery Complex at Bantala, Kolkata are situated on the boundary of the EKW, a Ramsar site, and so this work is thought to be important to assess the carbon-budget of the EKW ecosystem. Note de contenu : - MATERIALS AND METHODS - RESULTS : Process variations - Bag leather tanneries - Glove leather tanneries - Shoe upper tanneries - DISCUSSION : Soaking - Liming - Pickling and chrome tanning - Mechanical operations and post-tanning - Carbon sources En ligne : https://drive.google.com/file/d/1aVYTSm-19LE3A6Gro5nlskWAaGy2YqXH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23227 [article]

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Assessment of carbon contribution to the East Kolkata Wetland ecosystem (Ramsar Site : 1208) by leather producing units of the Calcutta leather complex : Part II / Sudin Pal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 2 (03-04/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 2 (03-04/2015) . - p. 70-79 Titre : Assessment of carbon contribution to the East Kolkata Wetland ecosystem (Ramsar Site : 1208) by leather producing units of the Calcutta leather complex : Part II Type de document : texte imprimé Auteurs : Sudin Pal, Auteur ; Buddhadeb Chattopadhyay, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2015 Article en page(s) : p. 70-79 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bilan des émissions de gaz à effets de serre Cuirs et peaux -- Industrie -- Inde Dioxyde de carbone Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : ln the context of addition of carbon to East Kolkata Wetland (EKW) ecosystem, an attempt has been made to provide a comprehensive computation of carbon input by raw hides-skins and different chemicals ; and carbon output by various solid and liquid waste from the leather industry. The calculations are based on the conventional operations of nine tanneries of which three produce bag leather, three gloves and three shoe uppers. The amount of carbon that enters into the leather industry depends upon the selection of raw hides and skins, percentage of chemicals used and purity of chemicals. In case of bag leather and shoe upper manufacturing units the carbon value changes depending on the tannery specific finishing recipe, spray types and number of mats. Besides this the carbon value also changes with the customerfs required finish. Whereas the carbon value of solid and liquid wastes changes depending upon the carbon input, mechanical operations and the binding of chemicals with hides and skins. The analysis of large samples from nine selected tanneries has permitted us to calculate that 396.1 ± 11.67kg carbon are present in one tonne raw catie hides or skins. The processing of this one tonne caille raw hides and skins results in 65.54 t 13.06kg carbon being incorporated with chemicals and, from which 320.75 ± 16.37kg of carbon are discharged in the EKW area through different solid and liquid wastes. The tannery agglomerates at the Calcutta Tannery Complex at Bantala, Kolkata are situated on the boundary of the EKW, a Flamsar site, and sa this work is thought to be important to assess the carbon-budget of the EKW ecosystem. En ligne : https://drive.google.com/file/d/11Aom5PWXk90trk2XyRQD5hDlRulnxAzT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23743 [article]

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Characterization and ecotoxicity studies of tannery wastes envisagine environmental impact assesment / Buddhadeb Chattopadhyay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 9 (11/1999)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 9 (11/1999) . - p. 337-346 Titre : Characterization and ecotoxicity studies of tannery wastes envisagine environmental impact assesment Type de document : texte imprimé Auteurs : Buddhadeb Chattopadhyay, Auteur ; Ranjan Gupta, Auteur Année de publication : 1999 Article en page(s) : p. 337-346 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This work was initiated to study the physico-chemical and biological conditions of the tannery effluent and their influence on the east Calcutta wetland ecosystem. Temperature, DO, BOD, COD, TDS, TSS, Conductivity, Total hardness, Chloride content, pH, Phosphates, Nitrates, Acidity and Alkalinity were recorded from four different spots on the sewage carrying canals in the eastern Calcutta (Lat. 22o33’-22o40’ N; long. 88o25’-88o 35’ E). Concentrations of heavy metals as Pb, Cu, Cr, Zn, Fe and Mn in tannery wastewater's and tannery sludge were also determined. Accumulation of these metals in different plant parts and fish organs were also studied. East Calcutta wetland ecosystem exhibited significant ameliorative role in waste stabilization and managing hazardous pollutants. En ligne : https://drive.google.com/file/d/18FGxq65GqRoxZmW6ZVCXzZEmOrOxLM0R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4411 [article]

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Chemistry of water / Buddhadeb Chattopadhyay in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 4 (07-08/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 4 (07-08/2021) . - p. 201-206 Titre : Chemistry of water Type de document : texte imprimé Auteurs : Buddhadeb Chattopadhyay, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2021 Article en page(s) : p. 201-206 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eau -- Chimie Index. décimale : 553.7 Eau : classer ici les ouvrages généraux sur l'eau Résumé : A leather chemist looks at and reviews the properties of water — a much-used and essential part of our industry. The many useful properties of water are discussed and explained by reference and comparison with everyday terms and events. We may not consider these properties when using water but they are the reasons why water has many uses in all walks of life and in the leather industry. The article ends with a note of caution about the need for water conservation. Note de contenu : - INTRODUCTION : The blue planet - Electronic configuration - Water as a polar solvent - Colligative structure and molecular dynamism of water - Dissociation of water and pH scale - Henderson-Hasselbalch equation - Did you say as simple as water - Table 1 : Estimated quantities of water in various forms in the Earth in terms of cubic miles - Fig. 1 : Four sp3 orbitals in tetrahedral orientation - Fig. 2 : Sp3 hybridisation - Fig. 3 : Bond angles and electron pair - Fig. 4 : Electronegativity of O - Fig. 5 : Dipole moment - Fig. 6 : Water, a proton acceptor and donor En ligne : https://drive.google.com/file/d/1ozCrH_XbgNOW38om7pSG9RWuQ8L7PVL4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36110 [article]

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Chromium in the tanning industry : an odissey from cradle to grave / Buddhadeb Chattopadhyay in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 4 (07-08/2012)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 4 (07-08/2012) . - p. 133-140 Titre : Chromium in the tanning industry : an odissey from cradle to grave Type de document : texte imprimé Auteurs : Buddhadeb Chattopadhyay, Auteur ; Anulipi Aich, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2012 Article en page(s) : p. 133-140 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent -- Toxicologie Cuirs et peaux -- Industrie -- Aspect de l'environnement Cuirs et peaux -- Industrie -- Inde Eaux usées Pollution Sulfate de chrome Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The authors present a review of chromium in the industry together with detailed reports of the remediation of chromium pollution by wetlands. Chromium is the buzzword of both tanners and environmental scientists. Because ithas several advantageous properties over other tanning agents, 80-90 % of leather today is tanned with chromium salts (Basic Chrome Sulphate). In pre-tanning processes hides and skins are soaked ; hair and keratinous debris in the epidermis are removed and bated. The pelts are then acid pickled to prepare for addition of BCS salts. After full penetration of BCS in the pelts, pH is raised slightly by adding weak alkaline salts. This accelerates the de-protonation of hexaquachromium (III) complexes forming more stable µ-hydroxo-µ-sulphato complexes on one hand and formation of di--tri- or oligo-nuclear complexes by the way of polymerisation on the other. The contemporary process is exclusively based on single bath procedure and utilises Cr(III) only. In contrast, the obsolete double bath process, which involved the insitu reduction of chromate [Cr(VI)], is environmentally and toxicologically hazardous. The East Calcutta Wetlands ; currently a special conservation site (Ram Site N° 1208), at the eastern fringe of Kolkate city, West Bengal, India was contaminated by composite industrial and municipal wastewater continuously over the past years. A large volume (ca. RO 000m3 day-1) of highly contaminated effluent flows through a network of canals within the ECW ecosystem and are finally discharged into the Kultigong River, nearly 40 kms away from Calcutta city. On the journey through the canals, this composite wastewater is used for irrigating agricultural farms as well as for pisciculture in wastewater-fed fisheries. Chromium, being the most known toxic constituent of tannery effluent drawn the attention of environmental scientists, whether it has any detrimental effect on ecosystem and biota, when the effluent is used for pisciculture and agriculture. The present study mainly focuses on the adverse effects of chromium, if any, in the abiotic and biotic components of an ecosystem when discharged to the environment. Thought it has been proved that ECW played a crucial role in ameliorating contaminated industrial effluent, thus improving water quality and minimizing the detrimental effects on biota, care still has to be taken to stop insensitive handling and wastage of this valuable mineral resource. In India, the tanning sector inflicts a heavy toll on the chromium resource, as around 30-50 % of chromium that is consumed for leather processing, flows down the drain. It would be our moralduty to check this colossal wastage and think seriously about the recovery and reuse of spent chromium from tanneries. Note de contenu : - Chromium : a unique metal of industrial importance - Chromium and the tanning industry - Chroium in ecosystems and biota : Chromium in wastewater - Chromium in soil and sediment - Chromium in plants - Chromium in fish - Chromium in non-edible fauna En ligne : https://drive.google.com/file/d/1XLjNMGTqow3ODobRAVVAeHhGEbjVVwM5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15697 [article]

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The spread of leather observations, experience and personal thoughts on area yield / Buddhadeb Chattopadhyay in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 1 (01-02/2021)  

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