Academic literature on the topic 'Colorants – Élimination'
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Journal articles on the topic "Colorants – Élimination":
Kacha, S., M. S. Ouali, and S. Elmaleh. "Élimination des colorants des eaux résiduaires de l'industrie textile par la bentonite et des sels d'aluminium." Revue des sciences de l'eau 10, no. 2 (April 12, 2005): 233–48. http://dx.doi.org/10.7202/705279ar.
Abid, Aziza, and Abdeljalil Zouhri. "Substitution des floculants chimiques par le cactus dans le procédé de traitement par coagulation-floculation des rejets industriels de textile." Journal of Renewable Energies 20, no. 1 (October 12, 2023): 61–67. http://dx.doi.org/10.54966/jreen.v20i1.609.
Karim, Asmaa Bennani, Badia Mounir, Mohsine Hachkar, Mina Bakasse, and Abdelghani Yaacoubi. "Élimination du colorant basique « Bleu de Méthylène » en solution aqueuse par l’argile de Safi." 23, no. 4 (December 20, 2010): 375–88. http://dx.doi.org/10.7202/045099ar.
Dissertations / Theses on the topic "Colorants – Élimination":
Zaied, Salem Manel. "Synthèses et caractérisations des oxydes de manganèse déposés en couches minces par voie électrochimique : application à la dépollution des effluents industriels chargés en colorants organiques." Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2012EVRY0042.
Pollution of dyes is a great problem of the environment in many countries that is why the main objective of this thesis was to test the potential of birnessite to degrade organic dyes. Initially, we determined the adequate experimental conditions to obtain thin layers of pure birnessite Mn7O13, with good reproducibility of synthesis. The good spontaneous reactivity of these layers to degrade and mineralize phenothiazine dyes (Methylene Blue, Azure A, Azure B, Azure C, Thionine), under mild conditions, was demonstrated. This degradation is via a reaction of N-demethylation followed by an adsorption step of Thionine, which is then mineralized into ammonium and nitrate ions. Their spontaneous reactivity is more effective for the degradation and mineralization of Indigo Carmine. Without the adsorption step of an intermediate compound, it is possible to reuse these samples without energy supply. The electrochemical activation of the layers of birnessite has significantly improved their efficiency for the degradation of phenothiazine dyes, by the absence of the adsorption step of the Thionine, compared to their spontaneous reactivity. In addition to their low energy requirement, the thin layers of birnessite appear very promising because their proven efficacy in interactions carried out in a cell with a continuous flow of solution. The birnessite thin film is a very interesting material for the development of a simple and ecological method applied to the treatment of waste water loaded with dyes
Monte, Atenas Gonzalo. "Rôle de l'état de surface du fer métal sur le mécanisme et la cinétique de décomposition de colorants azoïques." Vandoeuvre-les-Nancy, INPL, 2004. http://www.theses.fr/2004INPL032N.
Wastes produced by textile industry involve strongly recalcitrant molecules which can be hardly degraded by water treatment technology. The aim of fuis work is to monitor, understand and evaluate the mechanisms of azo- dyes degradation in aqueous solution in the presence of metallic iron in weak acidic solutions. Three dyes with specific molecular structure were investigated: orange II. Orange 1 and orange GG. Surface and interface analytical techniques like: FTIR-external reflection spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy were applied to monitor interface phenomena. UV-Vis spectrophotometry and atomic absorbance spectroscopy (AAS) were used to perform the solution analysis. Metallic iron interaction with and without dye solution were investigated. There are striking relationships between solution pH, iron surface composition, kinetics and reaction pathways of different orange decompositions. At pH 3 a thin surface layer is formed composed by FeO and Fe(OH)2 which thickness remains constant over reaction time. At pH 5. These products are intermediates and lepidocrocite is the final surface layer product which amount increases with time. The presence of dye in the soJution contacted with metaJJic iron does Dot produce significant ch. Wges in the iron surface layer composition already mentioned but modify importantly the oxidation rates. The decomposition mechanisms were elucidated. The first step of reaction involves dye adsorption through sulphonate groups. Afterwards, a reduction step lead to the cleavage of -N=N- bond and the formation of two amine intermediates. One stars adsorbed on the surface and undergoes immediately further decomposition white the second one is released to solution. Generally, the lower the open circuit potential (OCP) of iron, the faster the dye decomposition. Though, orange GG does not show this relationship. Modifications of iron surface layer composition and structure provide changes in kinetics and reaction pathways
Nayme, Christelle. "Étude de la dégradation par ozonation de deux colorants utilisés en teinture : recherche de sous-produits, étude cinétique et influence sur les applications industrielles." Rennes 1, 1997. http://www.theses.fr/1997REN10042.
Saliba, Rima. "Sorption d'ions métalliques et de colorants sur biopolymères modifiés ou non : application à la dépollution." Lyon 1, 2000. http://www.theses.fr/2000LYO10275.
Berez, Amor. "Dépollution par l'argile naturelle d'effluents teinturiers : étude expérimentale et modélisation du processus d'adsorption / désorption en réacteur fermé et colonne de percolation." Electronic Thesis or Diss., Strasbourg, 2015. http://www.theses.fr/2015STRAH007.
The aim of the work is to study the adsorption-desorption process of an azo dye on natural clay from two Tunisian deposits. The laboratory experiment was conducted in a closed reactor (batch) and percolation column. In the first step, two types of clay were used. The kinetic study shows that the adsorption and desorption follow the pattern of a pseudo first order phenomenon. A Langmuir isotherm is fitted to the adsorption process, while the desorption isotherm is characterised by hysteresis. The adsorption capacity of the Gafsa clay is more pronounced than that of the Borj Chekir clay. The percolation column studies were conducted on a mixture of of Borj Chekir clay and medium sand H2F. Hydrodynamic parameters were determined using an inert tracer (fluorescein). The reactive transport study showed that an increase in clay percentage will increase retention, but, on the other hand when using a constant percentage of the clay-sand mixture, increasing the injection rate will decrease the retention capacity of the mixture. The output curves were then compared with the numerical results of a 1D reactive transport model incorporating two reversible and irreversible adsorption sites
Powar, Ajinkya. "ACV et éco-conception dans le domaine de l'élimination des produits chimiques des déchets textiles pour le recyclage des textiles." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUN040.
The textile industry is evolving rapidly, and is also constantly changing. It is constantly developing new techniques for the recycling of the textiles and further research is vital for the future needs. The capability to recycle a textile material is a step towards a more green and sustainable industry. However, there are various challenges and difficulties associated with the recycling of textiles. Colorants and other impurities present on the textiles pose a big challenge to the continuity of the chemical recycling. The purpose of our study is to find out methods for the removal of the dyes or colorants from the cotton textiles for the end of life scenarios like recycling. The removal process of the chemical additives in an ecological way would add value to the recycling of textiles, which would help to obtain a recycled textile with the upgraded quality. To examine this subject, a literature study with respect to the chemicals and the removal process along with the recycling methods was done. In general, alkaline reductive treatment is performed using sodium hydroxide and reducing agent like sodium hydrosulphite for the color stripping of the reactive dyed textiles. Bibliographic survey on the various color stripping process, their drawbacks, viability for industrial scale-up etc was also performed. In this study, we have proposed the application of the ozone assisted process for the color stripping of the reactive dyed textiles using the pilot scale setup. The quality of the color stripped fabrics was determined in terms of the color stripping %, mechanical properties and the colorimetric analysis. Response surface methodology tools like the Box-Behnken design was utilized to examine the effects of three parameters like pH of the treatment (3-7), the reaction time (10-50 min) and the ozone concentration (5-85 g/m3 of ozone). With the ozonation process, color stripping of almost 98 % was achieved. The ozonation process is done at room temperature and also can be performed without any harsh chemicals. Additionally, we have also studied the other color stripping methods like the glucose based process. The results demonstrate that the glucose assisted process can emerge as an ecological alternative to the conventional process. Glucose can act as a green alternative reducing agent to the conventional reducing agent like sodium hydrosulphite. The damage to the mechanical properties are less as compared to the conventional and the ozone based process. However, the glucose assisted process utilized high temperatures for efficient color stripping. Finally, the study has highlighted the need of developing novel methods with minimum damage to the quality of the fibers. Amongst all the impact indicators, “Water resource depletion” is the highest for all the ozonation processes since it has the greatest relative value after normalization. It was found that the major contributors to the environmental impacts were Electricity and Oxygen formation. To optimize the impacts, new experimental conditions have been studied. Even, Color stripping of the pigment printed textiles was studied with the ozone assisted process. This study also highlights the need to study presence of contaminants like coatings present on the textiles during their end of life
Abidi, Nejib. "Interactions argiles naturelles-effluents teinturiers : influence des propriétés de surface des argiles et mécanismes d'adsorption des colorants." Electronic Thesis or Diss., Strasbourg, 2015. http://www.theses.fr/2015STRAH005.
Industrial effluents from textile activities often have a high pollution load readily biodegradable. Previous work has shown the potential of natural untreated clays to clean up these dyers effluents although anionic dyes are not easily absorbable on these media. The effluents also contain other chemical compounds used in the different stages of the dyeing process, and which are of various natures (salts, acids, bases, detergents, enzyme derivatives, etc ...). It appears that these auxiliary products play a role in the adsorption of anionic dyes on untreated clay. However, no currently known study has examined the effect of the additives from the dyeing process on the adsorption of dye onto clay. This is the first study to focus on the dye-clay-additive system. Adsorption / desorption batch tests were conducted considering different dye additive-clay systems. The tests’ results show that the enzyme like additives enhance the adsorption of anionic dye on the clay by neutralizing the negative charges and reinforcing clay-dye links. Other additives have the opposite effect, but do not offset the positive effect of enzyme like additives when mixed in the effluent. Assumptions of interactions involved in dye adsorption were made with the help of the results of infrared and mass spectrometry, zetametry and the modeling of adsorption isotherms
Abidi, Nejib. "Interactions argiles naturelles-effluents teinturiers : influence des propriétés de surface des argiles et mécanismes d'adsorption des colorants." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAH005/document.
Industrial effluents from textile activities often have a high pollution load readily biodegradable. Previous work has shown the potential of natural untreated clays to clean up these dyers effluents although anionic dyes are not easily absorbable on these media. The effluents also contain other chemical compounds used in the different stages of the dyeing process, and which are of various natures (salts, acids, bases, detergents, enzyme derivatives, etc ...). It appears that these auxiliary products play a role in the adsorption of anionic dyes on untreated clay. However, no currently known study has examined the effect of the additives from the dyeing process on the adsorption of dye onto clay. This is the first study to focus on the dye-clay-additive system. Adsorption / desorption batch tests were conducted considering different dye additive-clay systems. The tests’ results show that the enzyme like additives enhance the adsorption of anionic dye on the clay by neutralizing the negative charges and reinforcing clay-dye links. Other additives have the opposite effect, but do not offset the positive effect of enzyme like additives when mixed in the effluent. Assumptions of interactions involved in dye adsorption were made with the help of the results of infrared and mass spectrometry, zetametry and the modeling of adsorption isotherms
Berez, Amor. "Dépollution par l'argile naturelle d'effluents teinturiers : étude expérimentale et modélisation du processus d'adsorption / désorption en réacteur fermé et colonne de percolation." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAH007/document.
The aim of the work is to study the adsorption-desorption process of an azo dye on natural clay from two Tunisian deposits. The laboratory experiment was conducted in a closed reactor (batch) and percolation column. In the first step, two types of clay were used. The kinetic study shows that the adsorption and desorption follow the pattern of a pseudo first order phenomenon. A Langmuir isotherm is fitted to the adsorption process, while the desorption isotherm is characterised by hysteresis. The adsorption capacity of the Gafsa clay is more pronounced than that of the Borj Chekir clay. The percolation column studies were conducted on a mixture of of Borj Chekir clay and medium sand H2F. Hydrodynamic parameters were determined using an inert tracer (fluorescein). The reactive transport study showed that an increase in clay percentage will increase retention, but, on the other hand when using a constant percentage of the clay-sand mixture, increasing the injection rate will decrease the retention capacity of the mixture. The output curves were then compared with the numerical results of a 1D reactive transport model incorporating two reversible and irreversible adsorption sites
Harrlekas, Farida. "Couplage des procédés membranaires aux techniques physico-chimiques ou biologiques pour le traitement des rejets liquides de l'industrie de textile." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL008N/document.
The treatment of textile wastewater is usually done by a set of physicochemical processes coupled with a biological treatment. The effluent quality abides with difficulty the norms for reuse or discharge in environment. Various treatment combinations have been tested such as coagulation-flocculation (CF) and adsorption on activated carbon (PAC) coupled with membrane technologies (microfiltration (MF) or ultrafiltration (UF)), photocatalysis coupled with a biological treatment (membrane bioreactor (MBR) or a sequential batch reactor (SBR) or a biological and chemical anaerobic treatment. A general comparison was made to optimise the appropriate treatment. The combination CF-PAC-UF is the most effective of non-biological systems in terms of COD, absorbance and turbidity removal. The degradation of an azoïc and a phthalocyanine textile dyes by simple photocatalysis or combined to a membrane bioreactor has been investigated. Photocatalysis was achieved in a falling film reactor containing titanium dioxide fixed on cellulose fibres under UV irradiation. For both biological systems, although biomass was influenced by the variation of dyes concentration and the continuous operating mode for the MBR, it could resist to the applied conditions. However, even after pre-treatment where full decolouration was achieved, photocatalytic by-products were toxic and could inhibit COD removal. Chemical and biological anaerobic treatment have been applied to textile dyes and combined with a photocatalytic process. Photocatalysis was able to remove more than 90% color from crude as well as autoxidized reduced dye solutions. The photocatalytic end-products were not toxic toward methanogenic bacteria