Research progress in biohydrometallurgy of rare metals and heavy nonferrous metals with an emphasis on China

Wen, Jiankang; Chen, Bo-Wei; Shang, He; Zhang, Guocheng

doi:10.1007/s12598-016-0739-y

Cited by 16 publications

(4 citation statements)

References 37 publications

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“…Several taxa of sulfur-oxidizing bacteria have been isolated and identified, including Green sulfur bacteria (GSB), Purple sulfur bacteria (PSB), Purple non-sulfur bacteria (PNSB), and Colorless sulfur bacteria (CSB; Yang and Shao, 2018 ). It is worth noting that Acidithiobacillus , one of the CSB, play a major role in bioleaching, biodesulfurization, sulfur-containing wastewater treatment, and so on ( Wen et al, 2016 ; Singh et al, 2019 ). The genus Acidithiobacillus comprises eight recognized species, including Acidithiobacillus ferrooxidans , Acidithiobacillus ferrivorans , Acidithiobacillus ferridurans , Acidithiobacillus ferriphilus , Acidithiobacillus ferrianus , Acidithiobacillus sulfuriphilus , Acidithiobacillus thiooxidans (including Acidithiobacillus albertensis ), and Acidithiobacillus caldus (also called Fervidacidithiobacillus caldus ; Moya-Beltran et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Genome sequencing and metabolic network reconstruction of a novel sulfur-oxidizing bacterium Acidithiobacillus Ameehan

Wu,

Yuan,

Cheng

et al. 2023

Front. Microbiol.

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Sulfur-oxidizing bacteria play a crucial role in various processes, including mine bioleaching, biodesulfurization, and treatment of sulfur-containing wastewater. Nevertheless, the pathway involved in sulfur oxidation is highly intricate, making it complete comprehension a formidable and protracted undertaking. The mechanisms of sulfur oxidation within the Acidithiobacillus genus, along with the process of energy production, remain areas that necessitate further research and elucidation. In this study, a novel strain of sulfur-oxidizing bacterium, Acidithiobacillus Ameehan, was isolated. Several physiological characteristics of the strain Ameehan were verified and its complete genome sequence was presented in the study. Besides, the first genome-scale metabolic network model (AMEE_WP1377) was reconstructed for Acidithiobacillus Ameehan to gain a comprehensive understanding of the metabolic capacity of the strain.The characteristics of Acidithiobacillus Ameehan included morphological size and an optimal growth temperature range of 37-45°C, as well as an optimal growth pH range of pH 2.0-8.0. The microbe was found to be capable of growth when sulfur and K2O6S4 were supplied as the energy source and electron donor for CO2 fixation. Conversely, it could not utilize Na2S2O3, FeS2, and FeSO4·7H2O as the energy source or electron donor for CO2 fixation, nor could it grow using glucose or yeast extract as a carbon source. Genome annotation revealed that the strain Ameehan possessed a series of sulfur oxidizing genes that enabled it to oxidize elemental sulfur or various reduced inorganic sulfur compounds (RISCs). In addition, the bacterium also possessed carbon fixing genes involved in the incomplete Calvin-Benson-Bassham (CBB) cycle. However, the bacterium lacked the ability to oxidize iron and fix nitrogen. By implementing a constraint-based flux analysis to predict cellular growth in the presence of 71 carbon sources, 88.7% agreement with experimental Biolog data was observed. Five sulfur oxidation pathways were discovered through model simulations. The optimal sulfur oxidation pathway had the highest ATP production rate of 14.81 mmol/gDW/h, NADH/NADPH production rate of 5.76 mmol/gDW/h, consumed 1.575 mmol/gDW/h of CO2, and 1.5 mmol/gDW/h of sulfur. Our findings provide a comprehensive outlook on the most effective cellular metabolic pathways implicated in sulfur oxidation within Acidithiobacillus Ameehan. It suggests that the OMP (outer-membrane proteins) and SQR enzymes (sulfide: quinone oxidoreductase) have a significant impact on the energy production efficiency of sulfur oxidation, which could have potential biotechnological applications.

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Section: Introductionmentioning

confidence: 99%

Genome sequencing and metabolic network reconstruction of a novel sulfur-oxidizing bacterium Acidithiobacillus Ameehan

Wu,

Yuan,

Cheng

et al. 2023

Front. Microbiol.

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“…The development of reserves of placer deposits with a free-milling ore increases the proportion of copper deposits which are characterized with refractory raw materials. Due to this issue, many technological advances have taken place with the bioleaching of refractory mineral ores (Wen et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Bacterial and chemical leaching of copper-containing ores with the possibility of subsequent recovery of trace silver

et al. 2019

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“…Currently, industrial extraction of copper, gold, silver, and uranium from their respective ores through bioleaching process is in operation in various parts of the world such as China, Chile, Spain, USA, Australia, Ghana and Brazil 9 . About 20 % of the world's mined copper and 3% of the world's mined gold are generated through bioleaching process 10 . To meet growing demand for metals, solid urban wastes such fly ash, electronic scrap, and spent catalysts may be considered as "secondary ores" for metal recovery.…”

Section: Introductionmentioning

confidence: 99%

Bio-extraction of precious metals from urban solid waste

Das

Natarajan

Ting

2017

AIP Conference Proceedings

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Abstract.Reduced product lifecycle and increasing demand for electronic devices have resulted in the generation of huge volumes of electronic waste (e-waste). E-wastes contain high concentrations of toxic heavy metals, which have detrimental effects on health and the environment. However, e-wastes also contain significant concentrations of precious metals such as gold, silver and palladium, which can be a major driving force for recycling of urban waste. Cyanogenic bacteria such as Chromobacterium violaceum generate cyanide as a secondary metabolite which mobilizes gold into solution via a soluble gold-cyanide complex. However, compared to conventional technology for metal recovery, this approach is not effective, owing largely to the low concentration of lixiviants produced by the bacteria. To overcome the challenges of bioleaching of gold from e-waste, several strategies were adopted to enhance gold recovery rates. These included (i) pretreatment of ewaste to remove competing metal ions, (ii) mutation to adapt the bacteria to high pH environment, (iii) metabolic engineering to produce higher cyanide lixiviant, and (iv) spent medium leaching with adjusted initial pH. Compared to 7.1 % recovery by the wild type bacteria, these strategies achieved gold recoveries of 11.3%, 22.5%, 30% and 30% respectively at 0.5% w/v pulp density respectively. Bioleached gold was finally mineralized and precipitated as gold nanoparticles using the bacterium Delftia acidovorans. This study demonstrates the potential for enhancement of biocyanide production and gold recovery from electronic waste through different strategies, and extraction of solid gold from bioleached leachate.

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Research progress in biohydrometallurgy of rare metals and heavy nonferrous metals with an emphasis on China

Cited by 16 publications

References 37 publications

Genome sequencing and metabolic network reconstruction of a novel sulfur-oxidizing bacterium Acidithiobacillus Ameehan

Genome sequencing and metabolic network reconstruction of a novel sulfur-oxidizing bacterium Acidithiobacillus Ameehan

Bacterial and chemical leaching of copper-containing ores with the possibility of subsequent recovery of trace silver

Bio-extraction of precious metals from urban solid waste

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