Bench scale microbial catalysed leaching of mobile phone PCBs with an increasing pulp density

Garg, H. S.; Nagar, Neha; Ellamparuthy, G.; Angadi, Shivakumar I.; Gahan, Chandra Sekhar

doi:10.1016/j.heliyon.2019.e02883

Cited by 19 publications

(7 citation statements)

References 29 publications

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“…Outside the range of 1.8-2.5, it is due to disruption of microbial growth, while at pH 2.5 and 3.0, it is due to metal precipitation, low iron(III) solubility and formation of jarosite. Similar observations have also been made by other researchers (Yang et al, 2014;Khatri et al, 2018;Garg et al, 2019).…”

Section: Effect Of Medium Phsupporting

confidence: 91%

“…On the other hand, the WPCB matrix may contain alkaline substances such as reactive metals and organic substances which may increase acid consumption by raising the pH, thus inhibiting microbial growth and promoting Fe3+ consumption in the hydrolysis reaction. The effect of pulp density on the bioleaching process has also been noted by other researchers (Yang et al, 2014;Khatri et al, 2018;Garg et al, 2019), leveling it by adapting the bacteria to increasing waste concentrations.…”

Section: Effect Of Pulp Densitysupporting

confidence: 61%

“…3-5% of WEEE by weight are of particular importance. They contain, on average, 30-40% of metals by weight, with higher purity than in minerals, including base metals (Cu, Zn), precious metals (Au, Ag, Pd) and heavy metals (Isildar et al, 2019, Khatri et al, 2018;Garg et al, 2019;Tipre et al, 2021). However, the percentage of reuse and recovery of the precious components contained in the WPCB is very low.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of Selected Metals from Waste Printed Circuit Boards by Bioleaching Acidophilic Bacteria

Hołda

Krawczykowska

2021

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Technological innovations and increased demand for electronic devices resulted in production of more and more waste with highmetal content. Worldwide, 50 million tons of WEEE (Waste from Electrical and Electronic Equipment) are generated each year. Giventhe metal content present in electrical waste (e-waste), it is considered to be an urban mine and, if properly treated, can serve as analternative secondary source of metals. Waste printed circuit boards (WPCBs) that constitute approx. 3-5% of WEEE by weight areof particular importance. They contain, on average, 30-40% of metals by weight, with higher purity than in minerals. With environmental and economic benefits in mind, increasing attention is being paid to the development of processes to recover metals and othervaluable materials from WPCBs. The research presented in the article aimed at assessing the usefulness of the biotechnological methodfor leaching of selected metals from e-waste. The results indicate that it is possible to mobilize metals from WPCBs using microorganisms such as Acidithiobacillus ferroxidans bacteria

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Section: Effect Of Medium Phsupporting

confidence: 91%

Section: Effect Of Pulp Densitysupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Extraction of Selected Metals from Waste Printed Circuit Boards by Bioleaching Acidophilic Bacteria

Hołda

Krawczykowska

2021

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“…Pulp density also affects the recovery process due to the higher concentration of toxic materials and the change in pH. Garg et al [ 78 ] used mixed microbial consortia of iron and sulfur-oxidizing microorganisms to dispose of waste mobile phone WPCBs for batch bioleaching at varying pulp densities of 7%, 10% and 15% ( w / v ). The Ni recovery was 20.39% and 47.9% at a pulp density of 7% and 15%.…”

Section: Biochemical Processmentioning

confidence: 99%

Bioleaching of Typical Electronic Waste—Printed Circuit Boards (WPCBs): A Short Review

Yang

Wan

et al. 2022

IJERPH

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The rapid pace of innovations and the frequency of replacement of electrical and electronic equipment has made waste printed circuit boards (WPCB) one of the fastest growing waste streams. The frequency of replacement of equipment can be caused by a limited time of proper functioning and increasing malfunctions. Resource utilization of WPCBs have become some of the most profitable companies in the recycling industry. To facilitate WPCB recycling, several advanced technologies such as pyrometallurgy, hydrometallurgy and biometallurgy have been developed. Bioleaching uses naturally occurring microorganisms and their metabolic products to recover valuable metals, which is a promising technology due to its cost-effectiveness, environmental friendliness, and sustainability. However, there is sparse comprehensive research on WPCB bioleaching. Therefore, in this work, a short review was conducted from the perspective of potential microorganisms, bioleaching mechanisms and parameter optimization. Perspectives on future research directions are also discussed.

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“…As mentioned above, bioleaching experiments usually focus on the quantification of metals that are transferred by bacteria from the solid phase into solution or determine the change in residue composition by X-ray Fluorescence (XRF) 23 . Obtaining pore water samples is relevant since biological metal mobilization occurs at the micro-level between the bacteria and the ore grain 24 , 25 .…”

Section: Introductionmentioning

confidence: 99%

Post-measurement compressed calibration for ICP-MS-based metal quantification in mine residues bioleaching

Rito

Almeida

Coimbra

et al. 2022

Sci Rep

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Bioleaching is an actual economical alternative to treat residues, which allows, depending on the chosen strategy, two possible outcomes: (1) a leachate enriched with target metals, or (2) a residue enriched in target metals through the leaching of interfering components (IC). This work aimed to study the metals released by bioprocessing the Panasqueira mine tailings, as a strategy to increase critical metals' relative concentration in residues. Biostimulation of the local microbiota was compared to a bioaugmentation approach using the autochthonous Diaphorobacter polyhydroxybutyrativorans strain B2A2W2. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was selected to study the metals released in the leachate through multi-element external standards. A new data treatment method was developed to use a preliminary sweep of intensities to quantify the non-initial target metals concentration in the leachate, based on preliminary ICP-MS intensity measurements. The results demonstrated that biostimulation was an efficient bioleaching strategy for the IC silicon, aluminium, magnesium, selenium, manganese, zinc, iron, and copper, by decreasing concentration, resulting in a relative increase in the gallium and yttrium (10x) levels in the treated residue. The strategy followed to quantify a large number of elements with ICP-MS using a reduced number of data points for calibration proved valid and speeded up the analytical process.

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Bench scale microbial catalysed leaching of mobile phone PCBs with an increasing pulp density

Cited by 19 publications

References 29 publications

Extraction of Selected Metals from Waste Printed Circuit Boards by Bioleaching Acidophilic Bacteria

Extraction of Selected Metals from Waste Printed Circuit Boards by Bioleaching Acidophilic Bacteria

Bioleaching of Typical Electronic Waste—Printed Circuit Boards (WPCBs): A Short Review

Post-measurement compressed calibration for ICP-MS-based metal quantification in mine residues bioleaching

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