Microbial recovery of critical metals from secondary sources

Gavrilescu, Maria

doi:10.1016/j.biortech.2021.126208

Cited by 47 publications

(17 citation statements)

References 118 publications

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“…Bioleaching is a developed approach for extraction of valuable metals from y ashes with the advantage of avoiding high amounts and concentrations of chemical reagents used in acidic and alkaline leaching processes. [56][57][58][59] In bioleaching, several kinds of microorganisms including various species of bacteria and fungi are utilized to leach and recover a variety of metals from solid materials. The most common bacteria used in bioleaching belong to the thiobacilli genus, which are considered as acidophilic species, such as Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans.…”

Section: Bioleachingmentioning

confidence: 99%

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

et al. 2023

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Section: Bioleachingmentioning

confidence: 99%

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

et al. 2023

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“…Direct (Contact) bioleaching (including one-step or two-step methods) and indirect (Non-contact) bioleaching (spent-medium bioleaching) processes are two types of autotrophic bioleaching mechanisms ( Figure 1 ). Acidophiles function (in both contact and non-contact mechanisms) by oxidizing ferrous iron (Fe 2+ ) into ferric iron (Fe 3+ ) and by reducing sulfur to sulfuric acid (H 2 SO 4 ; Barnett et al, 2018 ; Gavrilescu, 2022 ). In the direct leaching mechanism ( Equation 1 ), microorganisms adhere to sulfide surface and oxidize it enzymatically to soluble metal sulfate.…”

Section: Mechanism Of Autotrophic Bioleachingmentioning

confidence: 99%

A review on the bioleaching of toxic metal(loid)s from contaminated soil: Insight into the mechanism of action and the role of influencing factors

Sarkodie

Jiang

et al. 2022

Front. Microbiol.

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The anthropogenic activities in agriculture, industrialization, mining, and metallurgy combined with the natural weathering of rocks, have led to severe contamination of soils by toxic metal(loid)s. In an attempt to remediate these polluted sites, a plethora of conventional approaches such as Solidification/Stabilization (S/S), soil washing, electrokinetic remediation, and chemical oxidation/reduction have been used for the immobilization and removal of toxic metal(loid)s in the soil. However, these conventional methods are associated with certain limitations. These limitations include high operational costs, high energy demands, post-waste disposal difficulties, and secondary pollution. Bioleaching has proven to be a promising alternative to these conventional approaches in removing toxic metal(loid)s from contaminated soil as it is cost-effective, environmentally friendly, and esthetically pleasing. The bioleaching process is influenced by factors including pH, temperature, oxygen, and carbon dioxide supply, as well as nutrients in the medium. It is crucial to monitor these parameters before and throughout the reaction since a change in any, for instance, pH during the reaction, can alter the microbial activity and, therefore, the rate of metal leaching. However, research on these influencing factors and recent innovations has brought significant progress in bioleaching over the years. This critical review, therefore, presents the current approaches to bioleaching and the mechanisms involved in removing toxic metal(loid)s from contaminated soil. We further examined and discussed the fundamental principles of various influencing factors that necessitate optimization in the bioleaching process. Additionally, the future perspectives on adding omics for bioleaching as an emerging technology are discussed.

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“…Various fields of activity, such as mining and steel, the metallurgical industry, the metal surface finishing industry, energy and fuel production, the fertilizer and pesticide industry, galvanizing, electrolysis, electro-osmosis, leather processing, the photographic industry, the electrical equipment industry and electronics, metal surface treatment, aerospace industry, etc., produce and discharge into the environment various industrial wastes and effluents containing heavy metals. Thus, metals, although usually regarded as resources, also become important pollutants of the environment, endangering the health of humans and the ecosystem [14,15]. The intensification of the use of metals and their various chemical compounds in industrial processes has the consequence of generating large amounts of effluents containing high levels of toxic metals.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Optimization of Heavy Metals Biosorption by Low-Cost Sorbents Using Response Surface Methodology

Ferţu

Bulgariu

2022

Processes

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This paper exploits, through modeling and optimization, the experimental laboratory data on the biosorption of heavy metal ions Pb(II), Cd(II), and Zn(II) from aqueous media using soybean and soybean waste biomasses. The biosorption modeling was performed using the Response Surface Methodology, followed by optimization based on numerical methods. The aim of the modeling was to establish the most probable mathematical relationship between the dependent variables (the biosorption efficiency of the biosorbents when adsorbing metal ions, R(%), and the biosorption capacity of sorbents, q(mg/g)) and the process parameters (pH; sorbent dose, DS (g/L); initial metal ion concentration in solution, c0 (mg/L); contact time, tc (min); temperature, T (°C)), validated by methodologies specific to the multiple regression analysis. Afterward, sets of solutions were obtained through optimization that correlate various values of the process parameters to maximize the objective function. These solutions also confirmed the performance of soybean waste biomass in the removal of heavy metal ions from polluted aqueous effluents. The results were validated experimentally.

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Microbial recovery of critical metals from secondary sources

Cited by 47 publications

References 118 publications

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

A review on the bioleaching of toxic metal(loid)s from contaminated soil: Insight into the mechanism of action and the role of influencing factors

Modeling and Optimization of Heavy Metals Biosorption by Low-Cost Sorbents Using Response Surface Methodology

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