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ADVANCED WASTEWATER TREATMENT USING NANOMAGNETITE TO REMOVE LEAD, COPPER AND ZINC IONS

Ioana Andreea Chirea, Alexandra Georgiana Vatui, Adelina Ioana Matei, Andreea-Nicoleta Ghiță, Lidia Licu

Abstract

The present paper is focused on depollution techniques representative for mining and non-ferrous metallurgy, which will assure a radically changed technological concept for a clean, safe and eco-efficient production, leading to sustainable development industry. At the same time, our works propose the implementation in the mining and metallurgical sector of unconventional processes through innovative techniques that lead to processes intensification, reduction of energy consumption, decrease of carbon footprint, by using the microwave field effect. The sorption of lead, copper and zinc from wastewater using nano-sized iron oxides was studied. The influence of pH, adsorbent type, initial concentrations and contact time of the removal process were investigated for all cases to see the differences between them and to determine in which the absorption capacity is the highest. In order to compare the results obtained after the adsorption process, solutions have been chemically analysed (ICP-OES, FAAS) both before and after adsorption. The data obtained from the parameters optimization process were used for determining the adsorption mechanism which led to achieve the equilibrium state. The equilibrium isotherms for the sorption of lead, copper and zinc were analysed using 3 widely used isotherm models for the sorption of this metal in single system solution. Langmuir, Freundlich and Temkin isotherms established for various initial metals ions concentration, for different doses of adsorbent material and for a range of time values, were used to fit the equilibrium data. Adsorption process was found to be highly dependent of pH and initial concentration of pollutant. Selective adsorption demonstrated that nanomagnetite could be a very promising nano-adsorbent to treat lead and copper contaminated water, the metal retention order being Pb> Cu> Zn.

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DOI resolver: doi.org/10.5593/sgem2021/5.1/s20.002

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