Zinc recovery from bioleachate using a microbial electrolysis cell and comparison with selective precipitation

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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SPIESS Sabine KUČERA Jiří VACULOVIČ Tomáš BIRKLBAUER Ludwig HABERMAIER Clemens CONDE Amaia Sasiain MANDL Martin HABERBAUER Marianne

Rok publikování 2023
Druh Článek v odborném periodiku
Časopis / Zdroj Frontiers in Microbiology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.3389/fmicb.2023.1238853
Doi http://dx.doi.org/10.3389/fmicb.2023.1238853
Klíčová slova microbial electrolysis cell; metal recovery; zinc recovery; bioleaching; selective precipitation
Popis Metal recycling is essential for strengthening a circular economy. Microbial leaching (bioleaching) is an economical and environmentally friendly technology widely used to extract metals from insoluble ores or secondary resources such as dust, ashes, and slags. On the other hand, microbial electrolysis cells (MECs) would offer an energy-efficient application for recovering valuable metals from an aqueous solution. In this study, we investigated a MEC for Zn recovery from metal-laden bioleachate for the first time by applying a constant potential of -100mV vs. Ag/AgCl (3M NaCl) on a synthetic wastewater-treating bioanode. Zn was deposited onto the cathode surface with a recovery efficiency of 41 +/- 13% and an energy consumption of 2.55 kWh kg(-1). For comparison, Zn recovery from zinc sulfate solution resulted in a Zn recovery efficiency of 100 +/- 0% and an energy consumption of 0.70 kWh kg(-1). Furthermore, selective metal precipitation of the bioleachate was performed. Individual metals were almost completely precipitated from the bioleachate at pH 5 (Al), pH 7 (Zn and Fe), and pH 9 (Mg and Mn).
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