Removal of Directs Dyes from Wastewater by Cotton Fiber Waste (original) (raw)
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TEKSTILEC
The removal of textile reactive dye from an aqueous solution on a new adsorbent prepared from waste cotton knitted fabric was investigated in this study. Waste cotton textile, used for the production of adsorbents, is a by-product of the cutting of stacked parts of cotton knitwear planned for the production of women’s T-shirts. The degree of efficiency of a paper pattern determines the amount of collected waste. The qualitative and quantitative characterization of the new adsorbent showed carbon and oxygen to be dominant in the chemical composition. A longer contact time means a greater amount of dye on the adsorbent, i.e. the dye concentration in the solution decreases with the duration of the adsorption process. The percentage of removed dye decreases with an increase in the initial dye concentration in the solution. However, the actual amount of adsorbed dye increases as the initial dye concentration increases. The results for equilibrium adsorption show that the Langmuir isother...
Application of Industrial Byproducts Removal of Dyes Reactive Textile
Revista Virtual de Quimica, 2013
The use of sawdust from Muracatiara (Astronium lecointei Ducke) and Angico branco (Anadenanthera colubrina) as low cost adsorbents for the removal of the dye Reactive Orange 16 (RO-16) in aqueous solution was the goal of this work. Variables such as pH (1-10), weight of adsorbent (0.1 and 0.2 g) and initial concentration of the dye (10-50 mg L-1) were studied, the highest values of q (mg g-1) at pH 1, a mass equal to 0.1 g and a concentration of 50 mg L-1. The kinetics of pseudo-second order was the best fit and the Freundlich model well described the adsorption process for both sawdust. FT-IR and Pi-GC/MS techniques were used to characterize groups and chemical structures responsible for the adsorption of the dye RO 16 in sawdust, allowing the filing of a mechanism of interaction between the adsorbate and adsorbent.
Cationic dyes removal from textile wastewaters by using ecofriendly adsorbents
Revista de Chimie -Bucharest- Original Edition-
The use of cheap and ecofriendly adsorbents, as: hemp fibres, cellolignine, peat and cotton, have been studied as an alternative substitution of AOPs for the removal of some cationic dyes with compact condensed structures from textile wastewater. The sorption capacity of adsorbents was evaluated spectrometricaly and removal degree for cationic dyes was calculated, as well as Langmuir and Freundlich models were applied to describe the sorption isotherm and the characteristic parameters are calculated. A kinetic study concerning sorption/desorption process was elaborated.
Removal of Dyes from Textile Industry Effluent: A Review
— Effluent from the textile industry contains toxic compounds. These compounds contaminate the surface water, thereby making it unfit for irrigation and drinking. Since farmers use water from the rivers for agricultural purposes and the residents of the town, use both the surface and underground water from the same area as potable water, it is quite unsafe to discharge this effluent into water body. Suspended solids can clog fish gills, either kill them or reduce their growth rate. They also reduce the ability of algae to produce food and oxygen. Therefore, proper treatment of effluent water and enforcement of pollution control by the regulatory authority on the indiscriminate discharge of textile wastewater into water bodies should be done. Batch adsorption experiments using Ashoka leaf powder, a low cost, locally available biomaterial as an adsorbent has been used for removal of cationic dyes such as Methylene blue, Malachite Green, Rhodamine B and Brilliant Green from effluent of textile industry.
A Review of Various Treatment Methods for the Removal of Dyes from Textile Effluent
Recent Progress in Materials
Wastewater generated by the textile industry has been a major environmental concern for a long. Production of fiber involves various steps and uses a lot of chemicals, dyes, and water. Therefore, the effluent produced from the textile industry needs proper purification before discharging into the water body. The current review summarizes various physical and chemical methods like ion exchange, coagulation-flocculation, membrane separation, membrane distillation, oxidation, ozonation, etc., for wastewater treatment. Along with this, adsorption methods, the various adsorbents used to purify wastewater, and the mechanism involved in adsorption have also been discussed. The biological method utilizes various microbes (bacteria, fungi, algae, and yeast) as a whole and the enzymes (laccase and azoreductase) secreted by them for wastewater treatment, which have been considered more feasible than physical and chemical methods. The adsorption and biological methods are better than other tech...
Application of ecological adsorbent in the removal of reactive dyes from textile effluents
Journal of Chemical Technology & Biotechnology, 2009
BACKGROUND: The capacity and mechanism of adsorption of the reactive dyes monoazo (RR2) and diazo (RR141), using a new adsorbent with a strong ecological appeal developed from the sludge of the textile effluent treatment process, were investigated. The kinetics and adsorption isotherms were determined at different temperatures and salt concentrations. After determination of the best experimental conditions for adsorption for both dyes, tests were carried out in fixed-bed adsorption columns.
Numerical study of the adsorption of dyes from textile effluents
Applied Mathematical Modelling, 2008
The textile industry is one of the greatest generators of liquid effluents, due to the high quantities of water used in the dyeing process. Fixed bed adsorption columns using activated carbon have been widely used in industrial processes for the removal of contaminants from textile effluents. In this study we present the modelling of an adsorption process applied to textile dyes, using fixed bed columns. This model permits the prediction of the dye concentration at the adsorption column outlet, considering the influence of various operational parameters. The adsorption isotherms of the dye Basic Green 4, over granular activated carbon at 25°C in an aqueous solution, were determined experimentally through a comprehensive series of tests. The Langmuir and Radke-Prausnitz models gave the best results for the adsorption isotherms. Tests were carried out in fixed bed columns to determine the breakthrough curves, with variations in feed rate, feed concentration, diameter of the column and mass transfer coefficient. The experimental conditions were simulated using a transient mathematical model. The data obtained numerically and experimentally were compared to validate the mathematical model proposed.
Adsorption Step in the Biological Degradation of a Textile Dye
Biotechnology Progress, 2001
This research documents the removal of the dye Gris Lanaset G from aqueous solutions by fungal pellets. Adsorption of the dye by dead biomass pellets of Trametes versicolor was determined and compared with dye removal by enzymatic degradation. Six kinetic equations were fitted to the experimental adsorption data obtained. The results indicate that kinetics such as the Elovich equation, which considers that the rate-controlling step is the diffusion of the dye molecules, show the best fit. Nonlinear Langmuir and Freundlich equations were also fitted into the adsorption data, and it can be concluded that the adsorption equilibrium can be interpreted by the Langmuir isotherm. Adsorption plays an important role in the process of the elimination of color from textile wastewater, although not all of the elimination is due to this physical process when the microorganism is active. The removal of color (around 90%) with active microorganisms is greater than that obtained with the adsorption process.
A ccomparative study on the treatment methods of textile dye effluents
Journal of chemical and pharmaceutical research, 2012
Textile and dyeing industries are responsible for contaminating water due to discharge of coloured effluents. So water pollution due to colour from textile and dyestuff industries is a topic of major concern of scientist today. The removals of dyes present in these industrial effluents have been received great potential in last few years. It is due to increasing environment awareness and implementation of ever strict environmental rules. These textile effluents are highly toxic as they contain a large no of metal complex dyes. These high concentrations of dyes causes may water borne diseases and increase the BOD level of receiving water. In the present paper various methods of treatment of textile effluent have been studied and discussed to find out effective treatment of textile effluents. In present years colour effluents is treated by so many techniques like Chemical oxidation, Ozonation, Ion exchange process, Electrochemical process, Electrolytic precipitation, Foam fractionatio...
2002
The process performance of coagulation to remove reactive dyes from dyehouse effluent is affected by multiple factors, which can be best examined in factorially-designed experiments. A preliminary jar-test procedure was used to select coagulants and the optimal pH and coagulant dosage ranges. An inorganic salt (ferrous sulphate) and an organic polymer (DEC 50) were selected for further studies. Factorially-designed jar-test experiments were performed with different compositions of a synthetic cotton processing wastewater to determine which factors most affected colour removal and highlight interactions between them. Some additives, such as an oxidative desizing agent and a peroxide stabiliser, favoured colour removal within specific concentration ranges. The presence of sizing agents and surfactants reduced process efficiency. Increasing concentrations of ferrous sulphate could counteract this, but would result in higher sludge disposal costs.