Prospective directions for biohydrometallurgy

Kaksonen, Anna H.; Deng, Xiao; Bohu, Tsing; Zea, Luis; Khaleque, Himel Nahreen; Gumulya, Yosephine; Boxall, Naomi J.; Morris, Christina; Cheng, Ka Yu

doi:10.1016/j.hydromet.2020.105376

Cited by 77 publications

(60 citation statements)

References 161 publications

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“…The iron oxidation activity of Acidithiobacillus ferrooxidans has been reported to have low, but varied tolerances to NaCl, which has resulted from the different pH values of the media that have been applied for its growth (5, 14). Microorganisms with iron oxidizing ability tolerant of saline conditions has been noted as a desirable trait in future bioleaching applications due to the importance of ferric iron as an oxidant to solubilize other metals (33). However, many acidophiles have been shown to tolerate lower concentrations of chloride as the medium pH is decreased (12).…”

Section: Discussionmentioning

confidence: 99%

Glutathione synthetase overexpression in Acidithiobacillus ferrooxidans improves halotolerance of iron oxidation

Inaba

West

Banta

2021

Preprint

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Acidithiobacillus ferrooxidans are well-studied iron- and sulfur-oxidizing acidophilic chemolithoautotrophs that are exploited for their ability to participate in the bioleaching of metal sulfides. Here, we overexpressed the endogenous glutamate--cysteine ligase and glutathione synthetase genes in separate strains and found that glutathione synthetase overexpression increased intracellular glutathione levels. We explored the impact of pH on the halotolerance of iron oxidation in wild type and engineered cultures. The increase in glutathione allowed the modified cells to grow under salt concentrations and pH conditions that are fully inhibitory to wild type cells. These results indicate that glutathione overexpression can be used to increase halotolerance in A. ferrooxidans and would likely be a useful strategy on other acidophilic bacteria.

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Section: Discussionmentioning

confidence: 99%

Glutathione synthetase overexpression in Acidithiobacillus ferrooxidans improves halotolerance of iron oxidation

Inaba

West

Banta

2021

Preprint

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“…Therefore, these factors need to be considered when selecting and implementing technologies for e-waste recycling. A number of reviews have been published investigating the use of pyrometallurgy and hydrometallurgy (including biohydrometallurgy) in recycling e-waste, particularly for the recovery of metal content from these wastes [8,9,[24][25][26][27]. In addition, the environmental impact of e-waste has been well documented, with many studies providing a life cycle assessment of technology applications for e-waste recycling in specific countries such as China [28] and regions such as Asia, Europe and North America [29].…”

Section: Figure 3 (A)mentioning

confidence: 99%

“…Pyrometallurgical and hydrometallurgical processes are commonly used to extract base metals and precious metals [8,9,24]. The use of microorganisms and their metabolites through biohydrometallurgical processing, or bioleaching, has also been investigated to extract metals from e-waste [27]. All these technologies have advantages and disadvantages that affect their suitability for practical implementation.…”

Section: Metal Recyclingmentioning

confidence: 99%

E-Waste Recycling and Resource Recovery: A Review on Technologies, Barriers and Enablers with a Focus on Oceania

Yken

Boxall

Cheng

et al. 2021

Metals

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Electronic e-waste (e-waste) is a growing problem worldwide. In 2019, total global production reached 53.6 million tons, and is estimated to increase to 74.7 million tons by 2030. This rapid increase is largely fuelled by higher consumption rates of electrical and electronic goods, shorter life cycles and fewer repair options. E-waste is classed as a hazardous substance, and if not collected and recycled properly, can have adverse environmental impacts. The recoverable material in e-waste represents significant economic value, with the total value of e-waste generated in 2019 estimated to be US $57 billion. Despite the inherent value of this waste, only 17.4% of e-waste was recycled globally in 2019, which highlights the need to establish proper recycling processes at a regional level. This review provides an overview of global e-waste production and current technologies for recycling e-waste and recovery of valuable material such as glass, plastic and metals. The paper also discusses the barriers and enablers influencing e-waste recycling with a specific focus on Oceania.

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“…Therefore, in this study we used H 2 SO 4 as leaching solution and H 2 O 2 as reducing agent. Other studies applied biohydrometallurgy or bioleaching techniques were also reported [34,35]. Calvert et al studied the recycling of metals from leachate of waste LIBs using hydrogen sulfide generated by a consortium of sulfate-reducing bacteria in a lactate-fed fluidized bed reactor [36].…”

Section: Introductionmentioning

confidence: 99%

High-Performance Recovery of Cobalt and Nickel from the Cathode Materials of NMC Type Li-Ion Battery by Complexation-Assisted Solvent Extraction

Wang

Yang

2020

Minerals

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The annual global volume of waste lithium-ion batteries (LIBs) has been increasing over years. Although solvent extraction method seems well developed, the separation factor between cobalt and nickel is still relatively low—only 72 when applying conventional continuous-countercurrent extraction. In this study, we improved the separation factor of cobalt and nickel by complexation-assisted solvent extraction. Before solvent extraction procedure, leaching kinetic of Li, Ni, Co and Mn was studied and can be explained by the Avrami equation. Leached residues were also investigated by SEM and XRD. Operation parameters of complexation-assisted solvent extraction were examined, including volume ratio of extractant to diluent, types of diluent, type of complexing reagent, extractant saponification percentage and volume ratio of organic phase to aqueous phase. The optimal separation factor of complexation-assisted solvent extraction could be improved to 372, which is five times that of conventional solvent extraction. The separation tendency would be interpreted by the relationship between extraction equilibrium pH and log distribution coefficient.

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Prospective directions for biohydrometallurgy

Cited by 77 publications

References 161 publications

Glutathione synthetase overexpression in Acidithiobacillus ferrooxidans improves halotolerance of iron oxidation

Glutathione synthetase overexpression in Acidithiobacillus ferrooxidans improves halotolerance of iron oxidation

E-Waste Recycling and Resource Recovery: A Review on Technologies, Barriers and Enablers with a Focus on Oceania

High-Performance Recovery of Cobalt and Nickel from the Cathode Materials of NMC Type Li-Ion Battery by Complexation-Assisted Solvent Extraction

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