Removing dyes used in the textile industry from the water bodies is a relevant task because of the importance of their high toxicity. The cotton industry waste is a big problem in the final disposal. Waste cotton fibrils were studied as adsorbent material to treat the coloured effluents of the textile industry. Washing with boiling water was determined as the most efficient method for cleaning. The material was physical characterized. After that, methylene blue adsorption tests were carried out to review the dry removal process at different pH. The Langmuir isotherm and the pseudo-second kinetic order models best described this adsorption process. The results would indicate that the process involve a chemisorptions.

In this paper, a laboratory scale fixed-bed reactor filled with cotton husk and quebracho chips was used to test the capabilities of these materials to be employed as dyes adsorbent materials in effluent treatment of textile industries. The adsorptiondesorption processes of methylene blue on both adsorbents were studied and the number of effective cycles was determined in each case. Desorbent efficiency of three substances was evaluated: NaCl 0.1 M, ethanol 50% (V/V) and tap water. As much as three adsorption-desorption cycles were obtained in all cases.Keywords--Methylene blue, fixed-bed reactor, cotton husk, quebracho chip.

“El Moringuero”, empresa radicada en Misiones-Argentina, se dedica a la producción de alimentos y cosméticos a partir de la planta Moringa oleífera, produciendo gran cantidad de residuos lignocelulósicos. El hierro es un metal abundante en la naturaleza y es un contaminante común en aguas subterráneas y superficiales. Los procesos de adsorción son una alternativa de bajo costo para remover hierro del agua. En este trabajo se evaluó el comportamiento de un residuo agroindustrial, cascarilla de semilla de Moringa, como adsorbente de hierro. Se realizó la curva de dosaje y el equilibrio de adsorción, obteniéndose que la mejor relación adsorbato-adsorbente se produce cuando la masa de cascarilla es de 300mg. Se evaluaron los modelos isotérmicos de Langmuir y Freundlinch, siendo el primero el que mejor correlación presentó. Se concluyó que la implementación de cascarilla de Moringa como material adsorbente es potencialmente una solución sostenible para la remoción de hierro en solución.