Bioleaching of copper from waste printed circuit boards by bacteria-free cultural supernatant of iron–sulfur-oxidizing bacteria

Wu, Wenyuan; Liu, Xiaocui; Zhang, Xu; Zhu, Mingming; Tan, Wen‐Song

doi:10.1186/s40643-018-0196-6

Cited by 84 publications

(40 citation statements)

References 36 publications

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“…Although the microbial population of the mixed consortium changed under the test condition, L. ferriphilum remained the dominant bacterial species. It was sequenced for the V4 region of 16S rRNA using a high-throughput RNA sequencing technique (Wu et al, 2018). 9K medium was used.…”

Section: Materials and Bacteriamentioning

confidence: 99%

Oxidative Stress Induced by Metal Ions in Bioleaching of LiCoO2 by an Acidophilic Microbial Consortium

Liu

Líu

et al. 2020

Front. Microbiol.

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An acidophilic microbial consortium (AMC) was used to investigate the fundamental mechanism behind the adverse effects of pulp density increase in the bioleaching of waste lithium ion batteries (WLIBs). Results showed that there existed the effect of metal-ion stress on the bio-oxidative activity of AMC. The Li + and Co 2+ accumulated in the leachate were the direct cause for the decrease in lithium and cobalt recovery yields under a high pulp density. In a simulated bioleaching system with 4.0% (w •v −1) LiCoO 2 , the intracellular reactive oxygen species (ROS) content in AMC increased from 0.82 to 6.02 within 24 h, which was almost three times higher than that of the control (2.04). After the supplementation of 0.30 g•L −1 of exogenous glutathione (GSH), the bacterial intracellular ROS content decreased by 40% within 24 h and the activities of intracellular ROS scavenging enzymes, including glutathione peroxidase (GSH-Px) and catalase (CAT), were 1.4-and 2.0-folds higher in comparison with the control within 24 h. In the biofilms formed on pyrite in the bioleaching of WLIBs, it was found that metal-ion stress had a great influence on the 3-D structure and the amount of biomass of the biofilms. After the exogenous addition of GSH, the structure and the amount of biomass of the biofilms were restored to some extent. Eventually, through ROS regulation by the exogenous addition of GSH, very high metal recovery yields of 98.1% Li and 96.3% Co were obtained at 5.0% pulp density.

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Section: Materials and Bacteriamentioning

confidence: 99%

Oxidative Stress Induced by Metal Ions in Bioleaching of LiCoO2 by an Acidophilic Microbial Consortium

Liu

Líu

et al. 2020

Front. Microbiol.

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“…IOB are capable of re-oxidizing ferrous ions to ferric ions during bioleaching [20,21]. Regenerated ferric ions can be reused to oxidize sphalerite [22]. Sphalerite usually occurs in association with pyrite (FeS 2 ).…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of Zn from sphalerite using Leptospirillum ferriphilum isolate: effect of temperature and kinetic aspects

Sundramurthy

Ramesh²,

Srinivasan

et al. 2020

Appl Biol Chem

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Biological methods for leaching of nonferrous and noble metals from its sulfide ores are widely applied at industrial enterprises of different countries. This process is based on the use of the oxidative activity of acidophilic microorganisms. Since all bio systems are quite sensitive to the temperature, bacterial leaching process also significantly effects. In the present study, the impact of temperature on bacterial leaching of Zn from its sulphide ore, sphalerite, was investigated using ore adapted iron oxidizing bacteria. The bacteria were isolated from mine drainage samples and subjected to gene sequencing. The acquired nucleotide sequence revealed that the isolate was Leptospirillum ferriphilum. The nucleotide sequence of L. ferriphilum isolate was submitted to National Center for Biotechnology Information (NCBI) and accession number KF743135 was assigned. Using the isolate, the Zn leaching data were collected in the 298-318 K temperature range. The results showed that leaching of Zn increases with temperature until optimum temperature of 313 K and achieves highest leaching efficiency of 96.96% within 20 days. Since bioleaching of minerals have become increasingly applied in different mining industries, there is immense important to analyze mechanistically-based kinetics for the design, optimization, operation, and control of biochemical processes. The kinetic study showed that the rate of Zn leaching was maximized at the optimum temperature. Further, the leaching data were analyzed using shrinking core model which revealed that the rate of leaching was inhibited by diffusion through product layer. Reaction kinetics is also to be contrasted with thermodynamics. Using Arrhenius law of thermodynamics, it was found that activation energy for Zn bioleaching reaction was 39.557 kJ mol −1. Such investigations will be necessitated for designing and implanting the ideal bioleaching system for metal bio-mining industries.

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“…In contrast, a lower leaching efficiency using the mixed cultures (mesophiles + moderate thermophiles incubated at 30°C) than that of obtained with only moderate cultures clearly indicated the suppressed activity caused by mesophiles in the mixed system. On the other hand, Wu et al 54 also employed the mixed consortia of L. ferriphilum and S. thermosulfidooxidans to successfully leach out the entire amount of copper within 2 h of leaching at 5 g L −1 pulp density. The study found indirect bioleaching as a promising option and confirmed a greater role of microorganisms in the regeneration of ferric ions as an oxidant within the system.…”

Section: Using Moderate Thermophilesmentioning

confidence: 99%

Biotechnological recycling of critical metals from waste printed circuit boards

Srivastava

Ilyas

Kim

et al. 2020

J of Chemical Tech & Biotech

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Critical metals are key raw materials for new generation clean energy production. The extraction of critical metals often follows the difficult processing of primary ores and they are many times recovered as the companion metals. With the depletion of primary reserves, the focus has now shifted to processing the urban mines, like electronic (e-)waste. Among the different types of e-waste, the waste printed circuit boards (WPCBs) are the major reservoir of high-value critical metals and are usually treated by the traditional pyro-and/or hydro-metallurgical techniques. However, the application of microbial activities in metals recycling is rapidly emerging as a green technology in comparison to smelter or chemical processing. The application of microorganisms (bacteria/fungi) in WPCBs' recycling is being increasingly explored in order to meet the parallel objectives of resource recovery and pollution mitigation. Therefore, the present article assesses the current frontiers in bioleaching of critical metals from WPCBs and contains discussions on process fundamentals, challenges, and perspectives. The applicability of microbial recycling of WPCBs at a higher scale in terms of a circular economy and urban mining notion, the techno-economic analysis, and environmental sustainability in comparison to the chemical processing route are also discussed.

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Bioleaching of copper from waste printed circuit boards by bacteria-free cultural supernatant of iron–sulfur-oxidizing bacteria

Cited by 84 publications

References 36 publications

Oxidative Stress Induced by Metal Ions in Bioleaching of LiCoO2 by an Acidophilic Microbial Consortium

Oxidative Stress Induced by Metal Ions in Bioleaching of LiCoO2 by an Acidophilic Microbial Consortium

Bioleaching of Zn from sphalerite using Leptospirillum ferriphilum isolate: effect of temperature and kinetic aspects

Biotechnological recycling of critical metals from waste printed circuit boards

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