Bioleaching of low-grade waste printed circuit boards by mixed fungal culture and its community structure analysis

Xia, Mingchen; Bao, Peng; Liu, Ajuan; Wang, Mingwei; Shen, Li; Yu, Runlan; Liu, Yuandong; Miao, Chang; Li, Jiaokun; Wu, Xueling; Qiu, Guanzhou; Zeng, Weimin

doi:10.1016/j.resconrec.2018.05.001

Cited by 84 publications

(16 citation statements)

References 72 publications

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“…The dehydrated samples were placed in a freeze dryer (Freeze Mobile 24, Vertis Company, Inc., Gardiner, NY, USA) for freeze-drying, and then placed on a sample stage for gold spray. The samples were observed using a scanning electron microscope (SEM) [ 55 , 56 , 57 ].…”

Section: Methodsmentioning

confidence: 99%

Inhibitory Mechanism of Trichoderma virens ZT05 on Rhizoctonia solani

Halifu

Deng

Song

et al. 2020

Plants

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Trichoderma is a filamentous fungus that is widely distributed in nature. As a biological control agent of agricultural pests, Trichoderma species have been widely studied in recent years. This study aimed to understand the inhibitory mechanism of Trichoderma virens ZT05 on Rhizoctonia solani through the side-by-side culture of T. virens ZT05 and R. solani. To this end, we investigated the effect of volatile and nonvolatile metabolites of T. virens ZT05 on the mycelium growth and enzyme activity of R. solani and analyzed transcriptome data collected from side-by-side culture. T. virens ZT05 has a significant antagonistic effect against R. solani. The mycelium of T. virens ZT05 spirally wraps around and penetrates the mycelium of R. solani and inhibits the growth of R. solani. The volatile and nonvolatile metabolites of T. virens ZT05 have significant inhibitory effects on the growth of R. solani. The nonvolatile metabolites of T. virens ZT05 significantly affect the mycelium proteins of R. solani, including catalase (CAT), superoxide dismutase (SOD), peroxidase (POD), selenium-dependent glutathione peroxidase (GSH-Px), soluble proteins, and malondialdehyde (MDA). Twenty genes associated with hyperparasitism, including extracellular proteases, oligopeptide transporters, G-protein coupled receptors (GPCRs), chitinases, glucanases, and proteases were found to be upregulated during the antagonistic process between T. virens ZT05 and R. solani. Thirty genes related to antibiosis function, including tetracycline resistance proteins, reductases, the heat shock response, the oxidative stress response, ATP-binding cassette (ABC) efflux transporters, and multidrug resistance transporters, were found to be upregulated during the side-by-side culture of T. virens ZT05 and R. solani. T. virens ZT05 has a significant inhibitory effect on R. solani, and its mechanism of action is associated with hyperparasitism and antibiosis.

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Section: Methodsmentioning

confidence: 99%

Inhibitory Mechanism of Trichoderma virens ZT05 on Rhizoctonia solani

Halifu

Deng

Song

et al. 2020

Plants

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“…A mixed culture containing P. lilacinum and A. niger inoculated with 8% pulp density of WPCBs yielded only 56% copper extraction in a stirred tank reactor (STR) bioleaching 56 . It was found that citric acid was the main biogenic acid produced (30.74 mM) without any addition of WPCBs, which decreased to 1.14 mM after 27 days of leaching.…”

Section: Developments In Microbial Leaching Of Critical Metals From Wmentioning

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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“…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%

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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Bioleaching of low-grade waste printed circuit boards by mixed fungal culture and its community structure analysis

Cited by 84 publications

References 72 publications

Inhibitory Mechanism of Trichoderma virens ZT05 on Rhizoctonia solani

Inhibitory Mechanism of Trichoderma virens ZT05 on Rhizoctonia solani

Biotechnological recycling of critical metals from waste printed circuit boards

Effect of Graphite on Copper Bioleaching from Waste Printed Circuit Boards

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