Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms

Hajdu-Rahkama, Réka; Ahoranta, Sarita; Lakaniemi, Aino–Maija; Puhakka, Jaakko A.

doi:10.1016/j.bej.2019.107286

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…For example, the leaching rate of heavy metals from tailings decreases with an increase in the solid concentration [46]. Furthermore, the activity of acidophilic bacteria in a stirred tank reactor under high pressure was studied for the first time, and the bacteria were found to remain active at a low oxygen partial pressure of +40 bar [47]. In a different study, ore particles of similar particle size fractions but different amounts of microcracks were prepared to investigate the influence of microcracks on bacterial activity, and the results showed that a larger number of microcracks were beneficial to bacterial growth and increased the bioleaching efficiency of copper by about 12.2% [48].…”

Section: Progressmentioning

confidence: 99%

Progress, Challenges, and Perspectives of Bioleaching for Recovering Heavy Metals from Mine Tailings

Gao¹,

Jiang

Mao

et al. 2021

Adsorption Science & Technology

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The accumulation of mine tailings on Earth is a serious environmental challenge. The importance for the recovery of heavy metals, together with the economic benefits of precious and base metals, is a strong incentive to develop sustainable methods to recover metals from tailings. Currently, researchers are attempting to improve the efficiency of metal recovery from tailings using bioleaching, a more sustainable method compared to traditional methods. In this work, the research status of using biological leaching technologies to recover heavy metals from tailings was reviewed. Furthermore, CiteSpace 5.7.R2 was used to visually analyze the keywords of relevant studies on biological leaching of tailings to intuitively establish the current research hotspots. We found that current research has made recent progress on influencing factors and microbial genetic data, and innovations have also been made regarding the improvement of the rate of metal leaching by biological leaching combined with other technologies. This is of great significance for the development of bioleaching technologies and industrial production of heavy metals in tailings. Finally, challenges and opportunities for bioleaching provide directions for further research by the scientific community.

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Section: Progressmentioning

confidence: 99%

Progress, Challenges, and Perspectives of Bioleaching for Recovering Heavy Metals from Mine Tailings

Gao¹,

Jiang

Mao

et al. 2021

Adsorption Science & Technology

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“…Gray areas mark the operational factors and their related metabolisms studied in the respective industrial samples. Industrial strips were sampled on: (1) 24 November 2015; (2) 29 December 2016; (3) 12 January 2017; (4) 26 January 2017; (5) 23 August 2017. The marks W0, W2, and W4 in S-410 correspond to three samplings performed biweekly before (0), after 2 weeks, and after 4 weeks since the blower was turned off.…”

Section: Candidate Genes Selection and Primer Designmentioning

confidence: 99%

“…Consequently, there is a “clearly crucial need to endow hydrometallurgy with technologies that allow it to increase its efficiency” [ 1 ]. The potential of bioleaching to enable recovery of metals from deposits to process available resources that are not amenable to metal recovery by any other means has been assessed, e.g., in Europe as well, aiming to develop environmentally sustainable mining operations [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

From Laboratory towards Industrial Operation: Biomarkers for Acidophilic Metabolic Activity in Bioleaching Systems

Marín

Cortés

Acosta

et al. 2021

Genes

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In the actual mining scenario, copper bioleaching, mainly raw mined material known as run‐of‐mine (ROM) copper bioleaching, is the best alternative for the treatment of marginal resources that are not currently considered part of the profitable reserves because of the cost associated with leading technologies in copper extraction. It is foreseen that bioleaching will play acomplementary role in either concentration—as it does in Minera Escondida Ltd. (MEL)—or chloride main leaching plants. In that way, it will be possible to maximize mines with installed solvent‐extraction and electrowinning capacities that have not been operative since the depletion of their oxide ores. One of the main obstacles for widening bioleaching technology applications is thelack of knowledge about the key events and the attributes of the technology’s critical events at the industrial level and mainly in ROM copper bioleaching industrial operations. It is relevant to assess the bed environment where the bacteria–mineral interaction occurs to learn about the limiting factors determining the leaching rate. Thus, due to inability to accurately determine in‐situ key variables, their indirect assessment was evaluated by quantifying microbial metabolic‐associated responses. Several candidate marker genes were selected to represent the predominant components of the microbial community inhabiting the industrial heap and the metabolisms involved in microbial responses to changes in the heap environment that affect the process performance. The microbial community’s predominant components were Acidithiobacillus ferrooxidans, At. thiooxidans, Leptospirillum ferriphilum, and Sulfobacillus sp. Oxygen reduction, CO2 and N2 fixation/uptake, iron and sulfur oxidation, and response to osmotic stress were the metabolisms selected regarding research results previously reported in the system. After that, qPCR primers for each candidate gene were designed and validated. The expression profile of the selected genes vs. environmental key variables in pure cultures, column‐leaching tests, and the industrial bioleaching heap was defined. We presented the results obtained from the industrial validation of the marker genes selected for assessing CO2 and N2 availability, osmotic stress response, as well as ferrous iron and sulfur oxidation activity in the bioleaching heap process of MEL. We demonstrated that molecular markers are useful for assessing limiting factors like nutrients and air supply, and the impact of the quality of recycled solutions. We also learned about the attributes of variables like CO2, ammonium, and sulfate levels that affect the industrial ROM‐scale operation.

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Acidithiobacillus ferrooxidans and mixed Acidophilic microbiota oxidation to remove sulphur impurity from iron concentrate

Qin

Liu

et al. 2022

Biochemical Engineering Journal

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Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms

Cited by 4 publications

References 32 publications

Progress, Challenges, and Perspectives of Bioleaching for Recovering Heavy Metals from Mine Tailings

Progress, Challenges, and Perspectives of Bioleaching for Recovering Heavy Metals from Mine Tailings

From Laboratory towards Industrial Operation: Biomarkers for Acidophilic Metabolic Activity in Bioleaching Systems

Acidithiobacillus ferrooxidans and mixed Acidophilic microbiota oxidation to remove sulphur impurity from iron concentrate

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