The Effect of Specific Conditions on Cu, Ni, Zn and Al Recovery from PCBS Waste Using Acidophilic Bacterial Strains

Mražíková, Anna; Kaduková, Jana; Marcinčáková, R.; Velgosová, Oksana; Willner, J.; Fornalczyk, A.; Saternus, M.

doi:10.1515/amm-2016-0049

Cited by 21 publications

(19 citation statements)

References 6 publications

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“…The positive influence of iron as an oxidative agent on copper bioleaching was also observed by other authors [14,19]. The highest metal extraction in the presence of Fe 3+ ions was also observed in the case of zinc (100%) dissolution [17].…”

Section: Metal Dissolution From Pcbssupporting

confidence: 75%

Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling

Sedláková-Kaduková

Marcinčáková

Mražíková

et al. 2017

Archives of Metallurgy and Materials

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The role of iron in metal-bearing waste bioleaching was studied. Four various types of waste (printed circuit boards (PCBs), Ni-Cd batteries, alkaline batteries and Li-ion batteries) were treated by bioleaching using the acidophilic bacteria A. ferrooxidans and A. thiooxidans (separately or in mixture). Role of main leaching agents (Fe 3+ ions or sulphuric acid) was simulated in abiotic experiments. Results showed that oxidation abilities of Fe 3+ ions were crucial for recovery of Cu and Zn from PCBs, with the efficiencies of 88% and 100%, respectively. To recover 68% of Ni from PCBs, and 55% and 100% of Ni and Cd, respectively, from Ni-Cd batteries both oxidation action and hydrolysis of Fe 3+ were required. The importance of Fe 2+ ions as a reducing agent was showed in bioleaching of Co from Li-ion batteries and Mn from alkaline batteries. The efficiency of the processes has increased by 70% and 40% in Co and Mn bioleaching, respectively, in the presence of Fe 2+ ions. Based on the results we suggest the integrated biometallurgical model of metal-bearing waste recycling in the effort to develop zero-waste and less energy-dependent technologies.

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Section: Metal Dissolution From Pcbssupporting

confidence: 75%

Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling

Sedláková-Kaduková

Marcinčáková

Mražíková

et al. 2017

Archives of Metallurgy and Materials

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“…Bioleaching, which is one of the most frequently studied unit operations in biohydrometallurgy, allows the amounts of reagents to be substantially reduced because they are produced in situ by microorganisms under soft operating conditions, i.e. low temperatures and a mild pH (Mrážiková et al, 2016). Bioleaching is an established commercial technology that has been applied worldwide for over half a century to process concentrates and mineral processing wastes.…”

Section: Introductionmentioning

confidence: 99%

Recovery of metals in a double-stage continuous bioreactor for acidic bioleaching of printed circuit boards (PCBs)

Hubau

Minier

Chagnes

et al. 2020

Separation and Purification Technology

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Many studies are now focusing on bioleaching methods to recover metals from WEEE. The efficiency of this process is highly dependent on microorganisms but also on the solid-liquidgas mass transfer, which is controlled by the reactor design. In this study, bioleaching of comminuted spent printed circuit boards (PCBs) was performed in a stirred tank reactor operated in batch mode and in a double-stage continuous bioreactor. The metal dissolution kinetics were compared. The first stage of the continuous bioreactor was a bubble column in which a BRGM-KCC acidophilic consortium comprising Leptospirillum ferriphilum and Sulfobacillus benefaciens was used to oxidise Fe(II) into Fe(III). The resulting liquor was used to leach out metals contained in PCBs in the second stage of the bioreactor with mechanical stirring. The use of two distinct stages allowed the bacteria to adapt gradually to the PCBs and reach high dissolution yields, i.e. 96% Cu, 73% Ni, 85% Zn and 93% Co when 1% (w/v) PCB scraps were added into the bioleaching reactor, with a hydraulic residence time of 48 hours. By using the double-stage bioreactor, the concentration of PCB scraps could be increased up to 1.8% (w/v) without reducing bioleaching performance. Biomass concentration in the second stage and adaptation of the microorganisms to the toxicity of the metals were sufficient for only the second stage to be used. Under these conditions, the dissolution kinetics were stable, even when iron was provided only by the comminuted PCBs.

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“…Various processes, such as mechanical (Meng et al 2017), pyrometallurgical (Jung et al 2017), hydrometallurgical (Pant et al 2012). and biometallurgical (Mrážiková et al 2016;Priya and Hait 2017) process, have been employed for the recovery of metals from PCBs.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have studied the process of bioleaching of copper from PCBs (Arshadi and Mousavi 2015; Mrážiková et al 2016). However, few process of bioleaching of PCBs was applied commercially for the reasons of long leaching time and low leaching efficiency.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Zhang

et al. 2018

Bioresour. Bioprocess.

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Background:The toxicity of waste printed circuit boards (PCBs) to bacteria was considered as the major limitation in bioleaching of copper from PCBs. To reduce the toxicity of PCBs, copper extraction from PCBs was investigated using bacteria-free cultural supernatant from some metallurgical microbial consortium, whose predominant organisms were Leptospirillum ferriphilum and Sulfobacillus thermosulfidooxidans.

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The Effect of Specific Conditions on Cu, Ni, Zn and Al Recovery from PCBS Waste Using Acidophilic Bacterial Strains

Cited by 21 publications

References 6 publications

Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling

Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling

Recovery of metals in a double-stage continuous bioreactor for acidic bioleaching of printed circuit boards (PCBs)

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

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