Influence of bacterial adhesion on copper extraction from printed circuit boards

Silva, René A.; Park, Jeonghyun; Lee, Eunseong; Park, Jaikoo; Choi, Siyoung Q.; Kim, Hyung-Seok

doi:10.1016/j.seppur.2015.01.038

Cited by 35 publications

(21 citation statements)

References 43 publications

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“…Finally, films were detected on some other fragments ( Figure 12D), but it was not possible to determine whether they were derived from the microbial activity or from lyophilisation of the 26 ionic solution. These observations did not enable us to confirm that bacteria became preferentially attached to certain fragments, as asserted by Silva et al (2015). Ta, W and Ga, the analytical uncertainties were still higher than the maximum concentration that would be reached if they were completely dissolved.…”

Section: Estimated Fe Dissolution Yieldmentioning

confidence: 76%

“…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%

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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: Estimated Fe Dissolution Yieldmentioning

confidence: 76%

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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“…Usually, the indirect contact mechanism is regarded as the mechanism of bioleaching of PCBs (Silva et al 2015). In addition, the mechanism of bioleaching of copper from PCBs is present as follows:…”

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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“…Oxidizing metal sulfides to sulfate via contact between bacteria and mineral (direct) and oxidizing Fe 2+ to Fe 3+ or/and S o to SO 4 (without contact: indirect) are the main mechanisms of metal extraction in the bioleaching process [53][54][55][56][57][58][59]. Moreover, it was well understood that oxidation of Fe 2+ to Fe 3+ during bioprocess decreases pH values and Fe T in the solution (precipitation of iron as jarosite and other iron oxides/hydroxides: Equations (2)-(4)) [60][61][62].…”

Section: Discussionmentioning

confidence: 99%

Effects of Conventional Flotation Frothers on the Population of Mesophilic Microorganisms in Different Cultures

et al. 2019

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Bioleaching is an environment-friendly and low-investment process for the extraction of metals from flotation concentrate. Surfactants such as collectors and frothers are widely used in the flotation process. These chemical reagents may have inhibitory effects on the activity of microorganisms through a bioleaching process; however, there is no report indicating influences of reagents on the activity of microorganisms in the mixed culture which is mostly used in the industry. In this investigation, influences of typical flotation frothers (methyl isobutyl carbinol and pine oil) in different concentrations (0.01, 0.10, and 1.00 g/L) were examined on activates of bacteria in the mesophilic mixed culture (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans, and Acidithiobacillus thiooxidans). For comparison purposes, experiments were repeated by pure cultures of Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans in the same conditions. Results indicated that increasing the dosage of frothers has a negative correlation with bacteria activities while the mixed culture showed a lower sensitivity to the toxicity of these frothers in comparison with examined pure cultures. Outcomes showed the toxicity of Pine oil is lower than methyl isobutyl carbinol (MIBC). These results can be used for designing flotation separation procedures and to produce cleaner products for bio extraction of metals.

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Influence of bacterial adhesion on copper extraction from printed circuit boards

Cited by 35 publications

References 43 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)

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

Effects of Conventional Flotation Frothers on the Population of Mesophilic Microorganisms in Different Cultures

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