Novel strategies of bioleaching metals from printed circuit boards (PCBs) in mixed cultivation of two acidophiles

Liang, Guoxi; Mo, Yiwei; Zhou, Quanfa

doi:10.1016/j.enzmictec.2010.08.002

Cited by 134 publications

(68 citation statements)

References 32 publications

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“…The EWM mass comprised of metals (32%), refractory oxides, ceramics and plastics. Similar results were reported in previous studies [1,17,18,19,20,21]. Untreated EWM contained mostly copper, base metals such as zinc, iron, lead and aluminium in significant proportions, and in lower concentration, gold, silver and other metals.…”

Section: Bioleaching Studiessupporting

confidence: 79%

“…The metallic composition was thus characterized by heterogeneity, which may be attributed to the origin of the EWM from various sources. Notably, the gold content was higher than found in most other studies [5,19,20,21,22,23], but comparable to that found in Hagelüken and Greinerstraat [24]. The presence of high concentration of copper-cyanide complexes interfere with gold cyanidation [25].…”

Section: Bioleaching Studiescontrasting

confidence: 39%

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Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

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Technology of biorecovery by Bacillus megaterium to obtain gold as a complex of gold-cyanide from electronic waste material (EWM) was done. The bacteria were subjected to pretreatment and mutation. The exist metals in solution were dissolved via the pretreatment, that way, contest for the cyanide ion from other metals was reduced. The bacteria were subjected to mutation to be able grow at pH 9, 9.5 and 10, where the pKa of HCN is 9.3, thereby, the cyanide ion concentration available for bioleaching was increased by alkaline pH. The new mutated bacteria from the pretreated EWM at 0.5% pulp density obtained gold of 17, 25 and 21% at pH 9, 9.5 and 10, respectively. Whereas the old unmutated bacteria that grow at pH 7, recovered 11%. The outcomes demonstrated that effectiveness of the mutated alkaline bacteria (B. megaterium) in gold biorecovery was more than normal physiological (pH 7).

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Section: Bioleaching Studiessupporting

confidence: 79%

Section: Bioleaching Studiescontrasting

confidence: 39%

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

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“…Also the high metal content (40 wt %), of waste PCB, makes it an attractive secondary source of metals. The metal recovery from waste PCB can contribute to the preservation of natural metal resources (Liang et al 2010;Egedy et al 2014). The conventional recycling processes generate secondary pollution (Marca et al 2002;Ilyas et al 2007;Sethu et al 2008;Egedy et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Enzymatic bioleaching of metals from printed circuit board

Jadhav

Hocheng

2014

Clean Techn Environ Policy

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Enzymes are powerful tool that help to maintain an unpolluted environment through their use in waste management. Enzymatic bioremediation is potentially a rapid method for removal of pollutants. Therefore, the present study has been carried out to investigate the possibility of bioleaching of metals from printed circuit board (PCB) powder by enzymatic bio-Fenton process. To do this glucose oxidase enzyme was used for in situ production of hydrogen peroxide (H 2 O 2 ). The H 2 O 2 was further used in Fenton's reaction for conversion of Fe(II) into Fe(III). Effects of various parameters such as incubation time, temperature, pH, and shaking speed on conversion of Fe(II) into Fe(III) were assessed. This enzymatic bio-Fenton process was further applied for bioleaching of metals. The results showed that metal recovery increased with an increase in initial Fe(II) concentration. Maximum recovery of metals was achieved at 250 mM initial Fe(II) concentration. The metal recovery decreased with an increase in concentration of PCB powder. The present research put forth a novel method for bioleaching of metals.

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“…Bioleaching technology was only investigated recently to process polymetallic wastes such as printed circuit boards (PCB) (Wang and et al, 2009;Yang et al, 2009;Liang et al, 2010;Xiang et al, 2010), electronic scraps (Brandl et al, 2001;Ilyas et al, 2007) shredder residues (Lewis et al, 2011). For this purpose, chemolithotrophic bacteria from the specie Acidithiobacillus ferrooxidans were mostly studied as a mean to regenerate ferric from ferrous iron.…”

Section: Introductionmentioning

confidence: 99%

Copper leaching from waste electric cables by biohydrometallurgy

Lambert

Gaydardzhiev

Léonard

et al. 2015

Minerals Engineering

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a b s t r a c tThis study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption. Operational parameters such as the nature of the oxidant (Fe 3+ , O 2 ), the initial ferric iron concentration (0-10 g/L) and the temperature (21-50°C) were identified to have an important influence on the degree of copper solubilisation. At optimal process conditions, copper extraction above 90% was achieved in both leaching systems, with a leaching duration of 1 day. The bacterial leaching system slightly outperformed the chemical one but the positive effect of regeneration of Fe 3+ was limited. It appears that the Fe 2+ bio-oxidation is not sufficiently optimised. Best results in terms of copper solubilisation kinetics were obtained for the abiotic test at 50°C and for the biotic test at 35°C. Moreover, the study showed that in same operating conditions, a lower acid consumption was recorded for the biotic test than for the abiotic test.

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Novel strategies of bioleaching metals from printed circuit boards (PCBs) in mixed cultivation of two acidophiles

Cited by 134 publications

References 32 publications

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

Enzymatic bioleaching of metals from printed circuit board

Copper leaching from waste electric cables by biohydrometallurgy

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