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Numerical study of the adsorption of dyes from textile effluents

机译：纺织废水中染料吸附的数值研究

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摘要

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 ℃ 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.
机译：由于染色过程中使用了大量的水，因此纺织工业是最大的液体废水产生者之一。使用活性炭的固定床吸附柱已广泛用于工业过程中，以去除纺织废水中的污染物。在这项研究中，我们介绍了使用固定床柱对纺织品染料进行吸附过程的建模。考虑到各种操作参数的影响，该模型可以预测吸附塔出口处的染料浓度。通过一系列综合测试，实验确定了碱性碱性4在25℃水溶液中在颗粒状活性炭上的吸附等温线。 Langmuir和Radke-Prausnitz模型给出了吸附等温线的最佳结果。在固定床色谱柱上进行测试以确定穿透曲线，其中进料速率，进料浓度，色谱柱直径和传质系数会有所变化。使用瞬态数学模型模拟了实验条件。比较了通过数值和实验获得的数据，以验证所提出的数学模型。

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