Stirred-tank and heap-bioleaching of shredder-light-fractions (SLF) by acidophilic bacteria

Kremser, Klemens; Thallner, Sophie; Schoen, Herta; Weiß, Sabine; Hemmelmair, Christine; Schnitzhofer, Wolfgang; Aldrian, Alexia; Guebitz, Georg M.

doi:10.1016/j.hydromet.2020.105315

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…The control of operating parameters contribute significantly to the fast and efficient metal recovery, but the operating cost is higher ( Rawlings et al, 2003 ). Recently, Kremser et al (2020) compared the potential of heap and stirred-tank bioreactors for metal recovery from shredder-light-fractions. Pure and co-culture of A. ferrooxidans and L. ferrooxidans were used for Cu, Zn and Ni recovery in batch and up-scale experiments, which highlights the potential for future commercial biomining applications with engineered Fe/S-oxidizing microbes.…”

Section: The Outlook Of Synthetic Biology-enhanced Biomining Applicat...mentioning

confidence: 99%

Harnessing synthetic biology for sustainable biomining with Fe/S-oxidizing microbes

Chen

Liu

Diep

et al. 2022

Front. Bioeng. Biotechnol.

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Biomining is a biotechnological approach where microorganisms are used to recover metals from ores and waste materials. While biomining applications are motivated by critical issues related to the climate crisis (e.g., habitat destruction due to mine effluent pollution, metal supply chains, increasing demands for cleantech-critical metals), its drawbacks hinder its widespread commercial applications: lengthy processing times, low recovery, and metal selectivity. Advances in synthetic biology provide an opportunity to engineer iron/sulfur-oxidizing microbes to address these limitations. In this forum, we review recent progress in synthetic biology-enhanced biomining with iron/sulfur-oxidizing microbes and delineate future research avenues.

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Section: The Outlook Of Synthetic Biology-enhanced Biomining Applicat...mentioning

confidence: 99%

Harnessing synthetic biology for sustainable biomining with Fe/S-oxidizing microbes

Chen

Liu

Diep

et al. 2022

Front. Bioeng. Biotechnol.

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“…Furthermore, the bioleaching of e-wastes, such as printed circuit boards ( Yang et al, 2017 ; Utimura et al, 2019 ; Andrade et al, 2022 ) has been intensively investigated. The bioleaching of metal oxides is mainly accomplished by bacterial sulfuric acid production, Fe 3+ regeneration, and the secretion of complexing agents ( Kremser et al, 2020 ). Still, a crucial step after bioleaching is the metal recovery from the bioleachate.…”

Section: Introductionmentioning

confidence: 99%

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

Spiess,

Kucera,

Vaculovic

et al. 2023

Front. Microbiol.

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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 −100 mV vs. Ag/AgCl (3 M 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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“…In the first mechanism, A. ferrooxidans and A. thiooxidans produce sulfuric acid according to Equation (1) [15]. This sulfuric acid is responsible for the dissolution of the waste matrix surrounding the metal sulfides or oxides and facilitates the production of soluble metal sulfates [19].…”

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confidence: 99%

“…In the third mechanism, A. ferrooxidans oxidizes Fe 2+ to form Fe 3+ , as presented in Equation ( 3). The oxidation of Fe 2+ to form Fe 3+ by iron-oxidizing bacteria leads to the dissolution of acid-soluble and acid non-soluble metal sulfides [19], since Fe 3+ subsequently causes the chemical leaching of metal-bearing minerals, as seen in Equation ( 4), which is a purely chemical process [20].…”

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confidence: 99%

Bioleaching of Zinc from Blast Furnace Cast House Dust

Sasiain,

Thallner,

Habermaier

et al. 2023

Minerals

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Metallurgical dusts are by-products from steel manufacturing. The high iron content of cast house dust (~64%) makes this by-product an interesting iron feedstock alternative. Therefore, its return into the internal steelmaking circuit, specifically in the sinter plant, is a common practice in the steel industry. However, this dust fraction also contains heavy metals, as zinc. As a result of the re-entry of zinc into the process, the zinc concentration in the blast furnace flue gas dust also increases. This prevents the full recirculation of the blast furnace flue gas dust in the steelmaking process despite its relatively high iron content (~35%), thus causing part of the blast furnace flue gas dust to end in the landfill. The goal of this study was to investigate the usage of bacteria, such as the sulfur oxidizing Acidithiobacillus thiooxidans or the iron and sulfur oxidizing Acidithiobacillus ferrooxidans, to leach the undesirable element zinc from the cast house dust while preventing the leaching of iron, by adjusting the sulfur addition and avoiding, at the same time, the accumulation of sulfur in the solid fraction. Experiments proved that a co-culture of A. thiooxidans and A. ferrooxidans can effectively leach zinc from metallurgical dusts, maintaining high iron concentrations in the material. The influence of elemental sulfur on the efficiencies reached was shown, since higher removal efficiencies were achieved with increasing sulfur concentrations. Maximum zinc leaching efficiencies of ~63% (w/w) and an iron enrichment of ~7% (w/w) in the remaining residue were achieved with sulfur concentrations of 15 g/L for cast house gas concentrations of 125 g/L.

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Stirred-tank and heap-bioleaching of shredder-light-fractions (SLF) by acidophilic bacteria

Cited by 13 publications

References 24 publications

Harnessing synthetic biology for sustainable biomining with Fe/S-oxidizing microbes

Harnessing synthetic biology for sustainable biomining with Fe/S-oxidizing microbes

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

Bioleaching of Zinc from Blast Furnace Cast House Dust

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