Copper extraction from coarsely ground printed circuit boards using moderate thermophilic bacteria in a rotating-drum reactor

Rodrigues, Michael Leonardo Marques; Leão, Versiane Albis; Gomes, Otávio da Fonseca Martins; Lambert, Fanny; Bastin, David; Gaydardzhiev, Stoyan

doi:10.1016/j.wasman.2015.04.001

Cited by 65 publications

(36 citation statements)

References 31 publications

(38 reference statements)

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“…Most of the studies also show that staggering the biological production of a lixiviant acidic solution containing Fe(III) and the addition of PCBs increases bioleaching efficiency, probably by lowering the toxicity of PCBs for microbial growth (Liang et al, 2013, Brandl et al, 2001). Figure 1 shows Cu dissolution kinetics determined in studies addressing PCB bioleaching (Adhapure et al, 2013;Arshadi and Mousavi, 2014;Arshadi and Mousavi, 2015;Bai et al, 2009;Bai et al, 2016;Bas et al, 2013;Brandl et al, 1999;Bryan et al, 2015;Chen et al, 2015;Choi et al, 2004;Gu et al, 2014;Gu et al, 2017a;Gu et al, 2017b;Guezennec et al, 2015;Ilyas et al, 2007;Ilyas et al, 2010;Ilyas et al, 2013;Ilyas et Lee, 2014;Işildar et al, 2015;Liang et al, 2010;Liang et al, 2013;Liang et al, 2016;Mäkinen et al, 2015;Mrážiková et al, 2013;Mrážiková et al, 2015;Mrážiková et al, 2016;Nie et al, 2014;Nie et al, 2015;Priya and Hait, 2018;Rodrigues et al, 2015;Shah et al, 2014;Shah et al, 2015;Silva et al, 2015;Sodha et al, 2017;Wang et al, 2009;Wang et al, 2016;Wang et al, 2018;…”

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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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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“…Several studies have described metal extraction from PCBs using bacteria, mainly Leptospirillum ferrooxidans, Acidithiobacillus thiooxidans, A. ferrooxidans, and Sulfobacillus thermosulfidooxidans, principally for the recovery of Cu and other metals such as Zn, Sn, Pb, and Ni [18][19][20][21][22][23][24][25][26][27][28][29][30]; Chromobacterium violaceum, Pseudomonas fluorescens, and Bacillus megaterium have also been used for Au recovery [31][32][33][34][35]. On the other hand, fungal bioleaching has several advantages since fungi show a greater ability to tolerate toxic materials, a faster leaching action than bacteria, and the ability to grow in both alkaline and acidic mediums [36].…”

Section: Introductionmentioning

confidence: 99%

Biotechnology for Metal Recovery from End-of-Life Printed Circuit Boards with Aspergillus niger

et al. 2020

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The growing production and use of electric and electronic components has led to higher rates of metal consumption and waste generation. To solve this double criticality, the old linear management method (in which a product becomes waste to dispose), has evolved towards a circular approach. Printed circuit boards (PCBs) are the brains of many electronic devices. At the end of their life, this equipment represents a valuable scrap for the content of base metals such as Cu and Zn (25 and 2 wt %, respectively) and precious metals such as Au, Ag, and Pd (250, 1000, and 110 ppm, respectively). Recently, biotechnological approaches have gained increasing prominence in PCB exploitation since they can be more cost-efficient and environmentally friendly than the chemical techniques. In this context, the present paper describes a sustainable process which uses the fungal strain Aspergillus niger for Cu and Zn extraction from PCBs. The best conditions identified were PCB addition after 14 days, Fe3+ as oxidant agent, and a pulp density of 2.5% (w/v). Extraction efficiencies of 60% and 40% for Cu and Zn, respectively, were achieved after 21 days of fermentation. The ecodesign of the process was further enhanced by using milk whey as substrate for the fungal growth and the consequent citric acid production, which was selected as a bioleaching agent.

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“…The proposed technologies include mainly pyrometallurgy (Cayumil et al, 2014;Flandinet et al, 2012), hydrometallurgy (Fogarasi et al, 2015;Tuncuk et al, 2012;Birloaga et al, 2014), bio-technology (Rodrigues et al, 2015;Pant et al, 2012;Zhu et al, 2011), and mechanical methods (Chao et al, 2011;Duan et al, 2009). Among these technologies, hydrometallurgical processes with relatively low capital costs, no gas/dust formation, operational selectivity and suitability for small scale applications are propitious alternatives for the treatment of waste PCBs (Birloaga et al, 2013;Xiu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A novel recovery method of copper from waste printed circuit boards by supercritical methanol process: Preparation of ultrafine copper materials

Xiu

Weng

et al. 2017

Waste Management

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a b s t r a c tIn this study, supercritical methanol (SCM) process was successfully used for the preparation of ultrafine copper materials from waste printed circuit boards (PCBs) after nitric acid pretreatment. Waste PCBs were pretreated twice in nitric acid. Sn and Pb were recovered by the first nitric acid pretreatment. The leach liquor with a high concentration of copper ions after the second nitric acid leaching was subjected to SCM process. The mixture of Cu and Cu 2 O with poor uniformity of particle size was formed due to the effect of ferric iron contained in the leach liquor of waste PCBs, while more uniform and spherical Cu particles with high monodispersity and smaller size could be prepared after the removal of Fe. The size of Cu particles increased obviously with the decline of SCM temperature, and particles became highly aggregated when the reaction temperature decreased to 300°C. The size of Cu particles decreased markedly with the decrease of initial concentration of copper ion in the leach liquor of waste PCBs. It is believed that the process developed in this study is simple and practical for the preparation of ultrafine copper materials from waste PCBs with the aim of recycling these waste resources as a high value-added product.

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Copper extraction from coarsely ground printed circuit boards using moderate thermophilic bacteria in a rotating-drum reactor

Cited by 65 publications

References 31 publications

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

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

Biotechnology for Metal Recovery from End-of-Life Printed Circuit Boards with Aspergillus niger

A novel recovery method of copper from waste printed circuit boards by supercritical methanol process: Preparation of ultrafine copper materials

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