Recuperação de metais utilizando o método lodo poroso: uma tecnologia inovadora para o tratamento de efluentes industriais

Abstract

The plating industry is an important industrial activity, which is related to plenty others sectors of the economy, such as construction, chemical, manufacturing, among others; however, plating process itself can be associated with a hazardous level of contaminants. As a consequence, the wastewater generated in this kind of industry demands increasingly special attention for both treatment and management of these substances in order to avoy enviormental impact and meet restrictive legislations. The present study developed a treatment technology for zinc plating industry wastewater, enable to recovery zinc íons and produce porous materials, as a simultaneous process. Therefore, the raw wastewater was collected directly from a zinc platting industrial plant, located in southern Brazil, in the city of Apucarana, Paraná State. The effluent samples were analyzed through characterizations techniques such as flame atomic absorption spectroscopy (FAAS), pH, and settlement of total suspended solidsProper characterised, the efluente was able to be treated, resulting solid and liquid samples, which in order to establish the effectiveness of the technique, the liquid samples were examinated by FAAS and the solid samples were characterised by x-ray difraction (XRD) and the specific surface area was carried out by Brunauer-Emmet-Teller (BET) analysis. The treatment proved to recover 100% of the Zn present in the wastewater. And after the surface analysis os solid samples, the material was identified as MOF ZIF-8, a high value porous material, with enormous potencial of applicantions. This treatment technique was designated The Porous sludge method, which, as shown in results, can be considered a new technology for metallic effluents treatment, enable to recover the metals ions and also produce high value porous materials, with industrial potencial of aplications.