Bioleaching of copper from metal concentrates of waste printed circuit boards by a newly isolated Acidithiobacillus ferrooxidans strain Z1

Yang, Chong; Zhu, Nengwu; Shen, Weihang; Zhang, Ting; Wu, Pingxiao

doi:10.1007/s10163-015-0414-7

Cited by 32 publications

(10 citation statements)

References 33 publications

(55 reference statements)

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“…A number of studies have been published on the selective recovery of base and precious metals from other types of ewaste, such as PCBs, using direct bioleaching to solubilize base metals. Generally, relatively high to high base metal recovery rates (75 to >99%) have been achieved in the laboratory using Fe 2+ -and/or S-oxidizing prokaryotes [40][41][42][43][44][45][46][47][48][49][50][51][52][53]. However, particularly when multiple base metals were targeted for extraction, the metal recovery rates could be significantly lower (mostly 50-60%) [51,53,54].…”

Section: Discussionmentioning

confidence: 99%

A Bioleaching Process for Sustainable Recycling of Complex Structures with Multi-Metal Layers

Pakostova,

Herath

2023

Sustainability

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Industrial waste is accumulating, while primary metal resources are depleting. Bioleaching has been shown to be a cost-effective and environmentally friendly approach to metal recovery from waste, but improved designs are needed for large-scale recycling. Metal components that are manufactured by electrodeposition over a mandrel can be difficult to recycle using conventional techniques due to their complex geometry and inner Ag coating. A sustainable biotechnology for separating Cu and Ag from waste electrodeposited components is presented. Two-step bioleaching experiments were performed, during which Cu was solubilized by Fe3+ regenerated by Acidithiobacillus (At.) ferrooxidans CF3 and a consortium of ten acidophilic Fe2+-oxidizers. High Cu recovery rates were achieved in agitated flasks (22 °C, pH 1.9), with At. ferrooxidans solubilizing 94.7% Cu in 78 days and the consortium 99.2% Cu in 59 days. Copper bio-solubilization was significantly accelerated in a laboratory-scale bioreactor (32 °C, 1 L air min−1) using the bacterial consortium adapted to elevated Cu concentrations, reaching >99.6% Cu extraction in only 12 days. The bioreactor was dominated by Leptospirillum and Acidithiobacillus, with their proportions changing (from 83.2 to 59% of total reads and from 3.6 to 29.4%, respectively) during the leaching process. Dissolved Cu was recovered from the bioleachates (containing 14 to 22 g Cu L−1) using electrowinning; >99% of the Cu was deposited (with Cu purity of 98.5 to 99.9%) in 3.33 h (at current efficiency between 80 and 92%). The findings emphasize the importance of a bioleaching system design to achieve economical separation of base and precious metals from industrial wastes. The presented technology minimizes waste generation and energy consumption. On a larger scale, it has the potential to contribute to the development of industrial recycling processes that will protect natural resources and contribute to the Net Zero target.

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Section: Discussionmentioning

confidence: 99%

A Bioleaching Process for Sustainable Recycling of Complex Structures with Multi-Metal Layers

Pakostova,

Herath

2023

Sustainability

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“…When continuing to increase pulp density to 10%, copper-leaching percentage was only 35%. High WPCB dosage resulted in lower copper extraction partly due to limitations in air distribution and oxygen mass transfer, which inhibited the oxidation efficiency of Fe 2+ by the bacteria [8,22,23]. In addition, copper concentration increased with WPCB dosage.…”

Section: Graphite Compatibility With Bacteriamentioning

confidence: 99%

“…Therefore, it has been widely used to recover valuable metals from low-grade minerals, and to remove heavy metals from various sources such as sludge, fly ash, polluted soil, and sediment [2][3][4][5][6]. Furthermore, bioleaching was found to be a viable method to leach metals from electronic waste, such as used batteries and waste printed circuit boards (WPCBs) [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphite on Copper Bioleaching from Waste Printed Circuit Boards

et al. 2020

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The efficient extraction of copper as a valuable metal from waste printed circuit boards (WPCBs) is currently attracting growing interest. Here, we systematically investigated the impact of bacteria on the efficiency of copper leaching from WPCBs, and evaluated the effect of graphite on bioleaching performance. The HQ0211 bacteria culture containing Acidithiobacillus ferrooxidans, Ferroplasma acidiphilum, and Leptospirillum ferriphilum enhanced Cu-leaching performance in either ferric sulfate and sulfuric acid leaching, so a final leaching of up to 76.2% was recorded after 5 days. With the addition of graphite, the percentage of copper leaching could be increased to 80.5%. Single-factor experiments confirmed the compatibility of graphite with the HQ0211 culture, and identified the optimal pulp density of WPCBs, the initial pH, and the graphite content to be 2% (w/v), 1.6, and 2.5 g/L, respectively.

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“…In the twenty-first century, E-wastes are known as a global concern, and toxic substances such as heavy metals can permeate into the groundwater and soil, which extremely threatens humans' health. Moreover, compared to traditional municipal waste, E-wastes contain valuable metals that can be recovered and reused, which brings about the evaluation of the recovery becomes remarkably crucial [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Biohydrometallurgical processes are low cost, environmentally friendly, and do not require skilled labor. In addition, they are efficient for low-grade ores and wastes [2,7]. Bioleaching is defined as an interaction between metals and microorganisms that can transfer metals to the liquid phase [4]; microorganisms (bacteria or fungi) produce organic or inorganic acids which solute metals [2].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Aspergillus niger and Penicillium simplicissimum for their ability to leach Zn–Ni–Cu from waste mobile phone printed circuit boards

Arshadi

Esmaeili

Yaghmaei

et al. 2021

J Mater Cycles Waste Manag

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In this research, Zn, Ni, and Cu recovery from mobile phone printed circuit boards was investigated. The initial pH and pulp density using Aspergillus niger or Penicillium simplicissimum fungi were optimized to improve the recovery of Zn, Ni, and Cu using a central composite design. Fungi were able to recover 97% of Cu. Often for Ni recovery, A. niger was more effective, but in low pulp densities and low pH, P. simplicissimum was preferred. For recovery of Zn, A. niger is more appropriate at pH lower than 6, but P. simplicissimum outperforms at pH higher than 6. Under the optimum conditions (pulp density of 4 gL −1 and initial pH 10), the respective recovery of Cu, Ni, and Zn was determined as 94%, 100%, and 100% using A. niger as well as 100%, 95%, and 87% using P. simplicissimum. At alkaline conditions, oxalic acid, citric acid, and gluconic acid are the main acids produced by A. niger; the main acid produced by P. simplicissimum is oxalic acid. Similarly, FTIR and chemical characteristics of the metabolites (the organic acid produced) were analyzed under optimal conditions using HPLC. A. niger in alkaline and acidic conditions produces more acids which lead to higher recovery.

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Bioleaching of copper from metal concentrates of waste printed circuit boards by a newly isolated Acidithiobacillus ferrooxidans strain Z1

Cited by 32 publications

References 33 publications

A Bioleaching Process for Sustainable Recycling of Complex Structures with Multi-Metal Layers

A Bioleaching Process for Sustainable Recycling of Complex Structures with Multi-Metal Layers

Effect of Graphite on Copper Bioleaching from Waste Printed Circuit Boards

Evaluation of Aspergillus niger and Penicillium simplicissimum for their ability to leach Zn–Ni–Cu from waste mobile phone printed circuit boards

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