Técnica de redução, separação e composição dos resíduos gerados no laboratório de eletroquímica e corrosão da UFCG - CES.

Abstract

Currently, teaching and research laboratories are one of the biggest pollutants, resulting from their laboratory activities in undergraduate courses. These residues are differentiated from industrial wastes because of their wide variety in their composition, which makes the treatment or recycling process difficult, in which if such waste is disposed of or improperly disposed of, it can cause serious damage to the environment and human health. As a result, several institutions are adopting Chemical Waste Management Programs and also proposing forms of treatment. In this context, this work aims to propose a methodology for the reduction of liquid residues to the solid phase, determination of the chemical composition, and to develop methods of recovery of the metals found in the liquid residues of the Laboratory of Electrochemistry and Corrosion. The methodology involved the drying process in the sun, to reduce the liquid residues, and later the determination of the chemical composition was carried out by the EDX technique, in order to make the separation of the metals by precipitation with HCl. EDX analysis to identify which metals are present in the formed precipitates. The results obtained were satisfactory, since the method of drying in the sun was effective, being possible to observe a great reduction in the volumes of the residues. By means of the EDX analysis it was verified that the elements found are in agreement with the same ones used in the generation of the residues analyzed. In the precipitation it was possible to separate the metals and still form crystalline monkeys identical to the nickel chloride. This precipitate was submitted to EDX analysis, and it was verified that this precipitate presented more than 50% of nickel. Thus, this work contributes significantly to the sustainability of the research laboratory, through the reduction, pollution and the volume of residues stored by the same.