One way to treat these effluents is with emulsion liquid membranes.Įmulsion liquid membranes are multiple emulsions characterized because the drop that forms the dispersed phase has smaller inner drops inside. Industries such as the viscose textile and the plating industry use zinc and their effluents must be treated to avoid contamination. Which is used in many industries and is hazardous to the environment and its recuperation from effluents is desirable. Industries that use heavy metals, must treat their effluents and minimize (or eliminate) the negative impact of these metals on the environment. Important compounds, because of their toxic characteristics, are heavy metals such as zinc, nickel, cobalt, chromium, cadmium and copper. Those laws limit the quantity of certain compounds that cannot be disposed freely into the environment because of their deleterious effects. Societies are more and more concerned about the environment and stricter laws to protect it are constantly being approved. Recibido: mayo de 2005 Recibido en forma final revisado: diciembre de 2005Įffluent treatment is one of the most important activities of many industries. Palabras clave: zinc, emulsión múltiple, tratamiento de efluentes, membranas líquidas. También se propuso un modelo de extracción que indica que la velocidad de extracción es proporcional a la concentración de iones zinc e inversamente proporcional a la concentración de protones. Los resultados muestran que a pH inferior a 3, la extracción no es posible y que se puede mejorar significativamente la extracción si se neutraliza continuamente la fase externa con NaOH. Se estudió el efecto de los protones (pH) en la extracción del zinc. En la extracción se utilizó querosén como fase membrana, DEHPA como transportador del zinc, SPAN 20 como surfactante y una solución de ácido sulfúrico en la fase interna de la emulsión. En este estudio se prepararon emulsiones múltiples por el método de dos pasos y se usaron para extraer iones de zinc de la fase continua externa de la emulsión. Las emulsiones múltiples se pueden utilizar para separar iones de zinc de efluentes acuosos, por ello, este método se puede usar en el tratamiento de efluentes industriales. SEPARACIÓN DEL ZINC DE SOLUCIONES ACUOSAS UTILIZANDO MEMBRANAS LÍQUIDAS EMULSIONADAS. Keywords: zinc, multiple emulsion, effluent treatment, liquid membranes. It shows that the extraction is proportional to the concentration of zinc ions and inversely proportional to the concentration of protons. A model of the kinetics of the extraction was proposed. The results show that below a pH of 3, there is no zinc extraction and that the extraction can be enhanced by neutralizing continuously with NaOH. A study of the effect of the protons (pH) in the extraction of zinc was made. For the extraction, kerosene was the membrane phase, DEHPA the carrier, SPAN 20 the surfactant and a solution of sulphuric acid the inner phase that received the zinc ions. In this study, multiple emulsions were prepared by the two step process and used to extract zinc ions from the continuous external aqueous phase. This method can be applied in industrial effluent treatment. *Corresponding author: ions can be separated from aqueous streams by multiple emulsion membranes. Laboratorio de Mezclado, Separación y Síntesis IndustrialĮscuela de Ingeniería Química. Zinc separation of aqueous solutions using emulsion liquid membranes.
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