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The three pot solution for chromium, tannins and solid waste : Recovery and reuse technique for spent semi-chrome liquor and chrome shavings / Subramanian Saravanabhavan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 5 (09-10/2004)
[article]
Titre : The three pot solution for chromium, tannins and solid waste : Recovery and reuse technique for spent semi-chrome liquor and chrome shavings Type de document : texte imprimé Auteurs : Subramanian Saravanabhavan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2004 Article en page(s) : p. 202-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Absorption
Chrome -- Recyclage
Colorimétrie
Déchets -- Elimination
Eaux usées -- Décontamination
Eaux usées -- Epuration
Liqueurs de tannage
Récupération (Déchets, etc.)
Solides
Tanins
Tannage au chrome
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The potential toxicity and environmental impact of chromium and tannins discharged from a tannery has become a key issue, in particular the wastewater generated from the semi-chrome process presents a problem of separating chromium from vegetable tannins by conventional precipitation. This work reports the removal of tannins and recovery of chromium from a spent semi-chrome wastewater using chrome shavings as the adsorbent. Batch mode treatment studies have been carried out to standardize the duration, quantity of chrome shaving and pH. A tannin removal efficiency of 96% has been observed. The tannin-free chromium bearing liquor after the adsorption process was subjected to conventional chromium recovery and re-use and was then used for tanning as a 40% replacement of commercial basic chromium sulphate. The tannin containing chrome shavings were used as a reductant for the preparation of basic chromium sulphate and this was also used for tanning trials. Tanning studies reveal that the quality of the wet blue leathers is on a par with leathers tanned with commercial BCS. Shrinkage temperatures and performance of the leathers, in comparison to a conventional leather, are comparable. Exhaustion of chromium was similar. The procedure described offers a viable solution for the removal of tannins and recovery/reuse of chromium from semi-chrome wastewater, as well as for the disposal of solid wastes such as chrome shavings. Note de contenu : - Introduction : Bulk studies
- Experimental methods : Treatment studies
- Recovery and reuse studies
- Tanning studies : Recovery and reuse - Comparison of the control and experimental (E1 and E2) leathers
- Table 1 : Characteristics of spent semi-chrome liquor and chrome shavings
- Table 2 : Efficiency of tannin removal at various chrome shaving offers
- Table 3 : pH Vs of tannin removal
- Table 4 : Subjective assessment data for control (C) and experimental (E1 and E2) leathers
- Table 5 : Strength characteristics of control (C) and experimental (E1 and E2) leathers
- Table 6 : Shrinkage temperature (Ts) and chromium content of leather and uptake of chromium during control (C) and experimental (E1 and E2) tanning
- Table 7 : Colour measurement data for the control (C) and experimental (E1 and E2) leathersEn ligne : https://drive.google.com/file/d/1y9d25ULtq10cvxZWkfZOsCI8wjcmydJR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39625
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 5 (09-10/2004) . - p. 202-207[article]Traitement des micropolluants organiques dans l'eau par des procédés d'oxydation avancée / Mehmet Ali Oturan in L'ACTUALITE CHIMIQUE, N° 277-278 (08-09/2004)
[article]
Titre : Traitement des micropolluants organiques dans l'eau par des procédés d'oxydation avancée Type de document : texte imprimé Auteurs : Mehmet Ali Oturan, Auteur ; Nihal Oturan, Auteur ; Jean-Jacques Aaron, Auteur Année de publication : 2004 Note générale : Bibliogr. Langues : Français (fre) Catégories : Déchets -- Elimination
Electrochimie
Micropolluants
Oxydation
Photochimie
Photodétérioration
Polluants organiques -- Détérioration
Pollution -- Lutte contreTags : 'Radicaux hydroxyles' Photo-Fenton Electro-fenton Pesticides Minéralisation Index. décimale : 628.16 Analyse, traitement, pollution Résumé : Les principes et le développement des procédés d'oxydation avancée électrochimiques et photochimiques destinés à la décontamination des eaux usées contenant des concentrations significatives des micropolluants organiques sont décrits. Le procédé électrochimique (électro-Fenton) est basé sur la production in situ et catalytique du réactif de Fenton (H2O2 + Fe2+ )par réduction simultanée de l'O2 et Fe3+ (catalyseur). Le réactif de Fenton engendre ensuite les radicaux hydroxyles .OH, espèces fortement oxydantes. Ces radicaux, générés électrochimiquement en milieu aqueux, oxydent ensuite les polluants organiques jusqu'à la minéralisation totale. Les méthodes photochimiques comportent la photolyse directe des polluants par l'irradiation UV ou visible, ou les procédés de photodégradation indirects tels que la photodécomposition de H2O2 (H2O2/UV) et le procédé photo-Fenton (H2O2/Fe2+/UV), conduisant à la minéralisation des polluants présents dans la solution traitée. Des exemples de l'application de ces procédés aux traitements des pesticides et des polluants industriels tels que des phénols en milieux aqueux sont donnés. En ligne : http://www.lactualitechimique.org/Traitement-des-micropolluants-organiques-dans- [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9474
in L'ACTUALITE CHIMIQUE > N° 277-278 (08-09/2004)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000027 - Périodique Bibliothèque principale Documentaires Disponible 010925 - Périodique Bibliothèque principale Documentaires Disponible Understanding paint recycling and the barriers to it in SURFACE COATINGS INTERNATIONAL, Vol. 100.1 (02-03/2017)
[article]
Titre : Understanding paint recycling and the barriers to it Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 50-52 Langues : Anglais (eng) Catégories : Déchets -- Elimination
Peinture -- Recyclage
Revêtements -- Aspect de l'environnement:Peinture -- Aspect de l'environnement
Royaume-UniIndex. décimale : 667.9 Revêtements et enduits Résumé : In 2015, the BCF commissioned a leftover paint survey, distributed to a nationally representative sample of adults and established that on average, each household in the UK has six cans of unused paint in their sheds or garages. What may seem like a minor inconvenience in household storage amounts to a serious environmental challenge, with a total of 55 million litre or 71500 tonnes of paint leftover each year which when disposed, 98% ends, up in landfill or is incinerated. Note de contenu : - Question 1. Does your HWRC accept liquid paint ?
- Question 2.1. How do you store paint at your HWRC ?
- Question 2.2. Do you pre-sort paint to separate SB paint from WB paint ?
- Question 2.3. What is th edestination of the SB paint, once sorted ?
- Question 2.4. What is the destination of the WB paint, once sorted ?
- Question 2.5. If you send to a paint recycler, why do you use this route ?
- Question 2.6 Provide an average cost/tonne to send for paint disposal
- Question 3.1. What advice do you give to the public if they ask about paint disposal
- Question 3.2. Why does your HWRC not accept liquid paint ?
- Question 3.3. What would have to change for your HWRCs to accept liquid paint ?En ligne : https://drive.google.com/file/d/1TJfUbJyzxBntLwCqWU1dHeq8xunYbftd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28292
in SURFACE COATINGS INTERNATIONAL > Vol. 100.1 (02-03/2017) . - p. 50-52[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18810 - Périodique Bibliothèque principale Documentaires Disponible Use of ultrasound in soaking for improved efficiency / Venkatasubramanian Sivakumar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)
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Titre : Use of ultrasound in soaking for improved efficiency Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; G. Swaminathan, Auteur ; P. G. Rao, Auteur Année de publication : 2004 Article en page(s) : p. 249-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de trempe -- Analyse
Bains de trempe -- Teneur en chlorure de sodium
Bains de trempe -- Teneur en solides
Cuirs et peaux de chèvres
Déchets -- Elimination
Peaux brutes -- Trempe
Peaux salées
Solides
UltrasonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The length of the soaking process plays a vital role in leather making; prolonged soaking may encourage putrefaction of the skin, thus there is a need to improve the efficiency of the soaking process. Power ultrasound has been employed with the aim of shortening process time.Two types of equipment were used, an ultrasonic cleaner (33 kHz) and an ultrasonic probe (20 kHz) in comparative experiments with static soaking. The efficiency of the soaking process was evaluated in terms of the removal of solids from wet-salted skin - a combination of salt, dirt, blood and soluble protein. We also studied the rate of water uptake of air-dried skins.
The results showed a 44% increase in solids removal by ultrasound in 1 hour soaking of wet salted goat skin. In the case of air-dried skins ultrasound reduced the soaking time by up to 75%. Analysis of the hydroxyproline content in the spent soak liquor indicates that the skin material is not adversely affected by ultrasound in soaking.
Efficiency of the soaking process has been evaluated from the removal of total solids from the wet-salted skin comprising salt, dirt, blood and soluble proteins. The rate of uptake of water in case of air-dried skins during the soaking process has also been studied ; the results show that soaking in the presence of ultrasound could reduce the soaking time by up to 75%.Note de contenu : - EXPERIMENTAL PROCEDURE : Ultrasonic set-up
- MATERIALS AND METHODS : Soaking of salted goat skin - Soaking of air-dried skin (based on air-dried skin weight)
- RESULTS AND DISCUSSION : Soaking of salted goat skin - Hydroxy proline content in spent liquor - Mechanisms for the improvement with ultrasound
- Table 1 : Total solids content in the spent liquor after 1 hour soaking of wetsalted goat skin both with and without ultrasound
- Table 2 : Sodium chloride content in the spent liquor after 1 hour soaking of wet-salted goat skin both with and without ultrasound
- Table 3 : Hydroxy proline analysis of spent soak, (Ultrasonic probe: 80W) at 30°C
- Table 4 : The effect of ultrasound (Ultrasonic probe: 100W) on water uptake in the soaking of air-dried goat skinEn ligne : https://drive.google.com/file/d/1gw-s2geYB2ZtGYH0KL2qhA59Q0FQQvpP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39618
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) . - p. 249-251[article]UV oxidation and recovery system for tannery unhairing waste / Imogene. L. Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
[article]
Titre : UV oxidation and recovery system for tannery unhairing waste Type de document : texte imprimé Auteurs : Imogene. L. Chang, Auteur ; Nicholas. S. Zaleiko, Auteur ; A. Peterson, Auteur Année de publication : 1982 Article en page(s) : p. 7-23 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Déchets
Déchets -- Elimination
Déchets organiques -- Recyclage
Epilage -- Aspect de l'environnement
Huiles et graisses
Photo-oxydation
Protéines
Radicaux libres (chimie)
Rayonnement ultraviolet
Récupération (Déchets, etc.)
Séparation (technologie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The free radical oxidation process as tested in the pilot system was found to be effective in the treatment of protein containing waste-streams of the tannery operations.
The basic techniques are equally applicable to protein containing wastes that originate in dairy, meat packing, and other food-related industries.
The mechanism of breakdown proceeds through an oxidative chain reaction, the concentration of H2O2, metal ion catalyst, UV irradiation and cavitation. Ninety percent of TOC reduction of tannery waste was achieved in a pilot system with 2 minutes of UV irradiation.
The addition of a liquid-solid separation step, allow for the recovery of organic fats, thus reducing the organic load on the actual treatment system. The recovered fats can then be used for decreasing the overall costs of treatment. The recovery of proteins by gravity, sedimentation, precipitation, washing and drying, will further reduce the organic load to the treatment system. This recovered material may be a source of additional income to the tannery. In view of rising costs both these recovery systems should be evaluated more completely, as presently a potential source of income to the tannery is being washed down the sewer.Note de contenu : - Fat and protein recovery system
- Process DesignEn ligne : https://drive.google.com/file/d/1x5jSgxkRq6e9pCIpu_47pQn18Jchivp0/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17407
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XXVII (Année 1982) . - p. 7-23[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008515 - Périodique Archives Documentaires Exclu du prêt Vers l'optimisation de nouveaux médias photocatalytiques et la conception de dispositifs de traitement de l'air et de l'eau / Didier Robert in L'ACTUALITE CHIMIQUE, N° 366 (09/2012)
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