Remoção de metais em efluentes utilizando tratamento com resinas de troca iônica recuperadas

Abstract

This work presents a study on a way oftreating effluents containing metals, by an ion exchange process that uses recovered resins. Today it is common in the industrial process to generate an enormous amount of effluents, and these need an appropriate treatment for their possible disposal in the environment. With this, we looked for a way to treat industrial waste, using resins previously used in other processes (mainly in water treatment) and having as study material, effluents containing metals, mainly electroplating residues. The main objective was the removal of metal ions, Zn, Cr, Fe, Cu and Ag, which are dissolved in effluents. The method was based on the exchange of the ion present in the resin for the metallic ion present in the sample, aiming to decrease the concentration of toxic and potentially polluting metallic elements, thus obtaining an effluent less impactful to the environment and suitable for disposal according to the legislation. The regeneration processes and the cost of raw materials used to make the column were also evaluated. As a result, it was possible to reduce the concentration of Cr, 99.4% of Zinc in a real effluent by 94% and still guarantee a regeneration of 4 times in the resin that was already reused without loss of removal efficiency.Keywords: Atomic absorptionspectrometry. Analysis of Effluents. Ion exchange resin.