Extraction of metals from electronic waste by bacterial leaching

Willner, J.; Fornalczyk, A.

doi:10.37190/epe130115

Cited by 42 publications

(35 citation statements)

References 24 publications

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“…While there is a gradual depletion of primary ores of these critical and precious elements, they are found in relatively high concentrations in electronic wastes. Waste printed circuit boards (PCBs), waste liquid crystal displays (LCDs), spent cathode ray tubes (CRTs), spent fluorescent lamps, waste hard disk drives (HDDs), spent light emitting diodes (LEDs) and spent batteries are the fastest growing WEEE and contain many critical and precious elements (Willner & Fornalczyk, 2013;Askari, Ghadimzadeh, Gomes, & Ishak, 2014;Natarajan, Tay, Yew, & Ting, 2015). For instance, Indium-tin oxide (ITO) forms the basis of LCDs and rise crucial demand for indium (In).…”

Section: Introductionmentioning

confidence: 99%

Recent advances on hydrometallurgical recovery of critical and precious elements from end of life electronic wastes - a review

Sethurajan

Hullebusch

Fontana

et al. 2019

Critical Reviews in Environmental Science and Technology

277

104

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Waste electrical and electronic equipment (WEEE) contains economically significant levels of precious, critical metals and rare earth elements, apart from base metals and other toxic compounds. Recycling and recovery of critical elements from WEEEs using a cost-effective technology are now one of the top priorities in metallurgy due to the rapid depletion of their natural resources. More than 150 publications on WEEE management, leaching and recovery of metals from WEEE were reviewed in this work, with special emphasize on the recent research (2015-2018). This paper summarizes the recent progress regarding various hydrometallurgical processes for the leaching of critical elements from WEEEs. Various methodologies and techniques for critical elements selective recovery (using ionic liquids, solvent extraction, electrowinning, adsorption, and precipitation) from the WEEEs leachates are discussed. Future prospects regarding the use of WEEEs as secondary resources for critical raw materials and its technoeconomical and commercial beneficiaries are discussed.

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Section: Introductionmentioning

confidence: 99%

Recent advances on hydrometallurgical recovery of critical and precious elements from end of life electronic wastes - a review

Sethurajan

Hullebusch

Fontana

et al. 2019

Critical Reviews in Environmental Science and Technology

277

104

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“…Biological alternatives emerged to reduce the negative environmental impacts caused by the application of the two described chemical processes [17]. These alternatives are based on utilizing bacteria such as Acidithiobacillus ferrooxidans and A. thiooxidans [18,19] which are able to induce the leaching of metals from sulfidic and non-sulfidic minerals like CuS [20,21].…”

Section: Introductionmentioning

confidence: 99%

Gold Bioleaching from Printed Circuit Boards of Mobile Phones by Aspergillus niger in a Culture without Agitation and with Glucose as a Carbon Source

Argumedo-Delira

Gómez-Martínez

Soto

2019

Metals

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Hydrometallurgical and pyrometallurgical processes to recover gold (Au) from cell-phone printed circuit boards (PCBs) have the disadvantage of generating corrosive residues and consuming a large amount of energy. Therefore, it is necessary to look for biological processes that have low energy consumption and are friendly to the environment. Among the biological alternatives for the recovery of Au from PCB is the use of cyanogenic bacteria and filamentous fungi in cultures with agitation. Considering that it is important to explore the response of microorganisms in cultures without agitation to reduce energy expenditure in the recovery of metals from PCB, the present investigation evaluated the capacity of Aspergillus niger MXPE6 and a fungal consortium to induce Au bioleaching from PCB in a culture medium with glucose as a carbon source and without agitation (pH 4.5). The results indicate that the treatments with PCB inoculated with the fungal consortium showed a considerable decrease in pH (2.8) in comparison with the treatments inoculated with A. niger MXPE6 (4.0). The fungal consortium showed a significantly higher Au bioleaching (56%) than A. niger MXPE6 (17%). Finally, the use of fungal consortia grown without agitation could be an alternative to recover metals from PCB, saving energy and material resources.

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“…The higher growth of people with advanced global economy leads on large use of electronic devastate, or e-waste (WEEE) that indicate to heat alternate of equipment, computer screens, lamps as well as other different IT tools which have discarded through their owners which is considered as waste lacking of re-using and directly influenced the environmental (the soil pollution) and it is the another major cause reduction of natural resources [1,2]. The electrical as well as electronic tools (as a result of e-waste from these products) are considered the enlargement of the technology in equivalent theme of the urbanization and industrialization in last and present decades [3].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2019

International Advanced Research Journal in Science, Engineering

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With the continual modernization, researchers and scientists are very conscious about the environmental issues. The E-waste which is relatively recent addition to the waste stream in the form of discarded electronic and electric equipment is getting increasing attention from policy makers as the quantity being generated rising rapidly. The consumption of e-waste has been exponential in the last two decades. The developing countries are facing huge challenges in the management of e-waste which are either internally generated or imported illegally as used goods in an attempt to bridge the so-called "digital divide". E-waste contains hazardous constituents that may negatively impact the environmental and affect human health if not properly managed. On the other hand, e-waste contains up to 60 metals including platinum, gold, silver, copper, aluminium, palladium, iron and other valuable metals. Considering these two facts along with the resource management strategy has been committed to extract precious metals from Printed Circuit Board (PCB) of e-waste. In this study, Printed Circuit Board (PCB) are collected from the motherboards of waste computers and performing several reactions in a chemical lab. Al 2 (SO) 4 has been prepared by using sulfuric acid and potassium hydro-oxide and CuSO 4 prepared by using nitric acid and sulfuric acid. In this preparation process the top most priority is placed on the environment friendly issues. This study will very helpful in the proper management of ewaste and reservation of our resources which are limited. 2 circuit, cathode ray tubes. In the same contrary, the components represent the valuable part of circuit which fabricates different metallic bodies containing copper and gold, zinc and others [16].Actually, in last decades, the quantity of CRT monitors as the form of television as well as computers is considered as the replacement Liquid Crystal Displays (LCD) The prediction goes that around 8.5 thousand tons televisions as well as computer monitors are redundant in the south Asia every year. These same circumstances are found in other industrial, developed with developing state in the world. So, this ratio indicated that re cycle must be needed [17]. As a result, during the last decades, numerous explorations have been planned or aimed at the innovation of reasonable techniques withdrawal for precious metallic substances. This process is continuing from the last several decades. Basically, these processes are divided in different ways such as physical, hydrometallurgical, bio metallurgical, and hydrometallurgical as well as electrochemical procedures. Here used the electrochemical techniques which are considered the most competent because lower discharge of poisonous gases with lower volatile metals, lower energy of expenditure, and small waste production with its easier operational circumstances.

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Extraction of metals from electronic waste by bacterial leaching

Cited by 42 publications

References 24 publications

Recent advances on hydrometallurgical recovery of critical and precious elements from end of life electronic wastes - a review

Recent advances on hydrometallurgical recovery of critical and precious elements from end of life electronic wastes - a review

Gold Bioleaching from Printed Circuit Boards of Mobile Phones by Aspergillus niger in a Culture without Agitation and with Glucose as a Carbon Source

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