Bioleaching of heavy metals from a low-grade mining ore using Aspergillus niger

Mulligan, Catherine N.; Kamali, Mahtab; Gibbs, Bernard F.

doi:10.1016/j.jhazmat.2004.02.040

Cited by 148 publications

(55 citation statements)

References 9 publications

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“…Most of our environmental isolates originating from highly Pb-contaminated soils produced large quantities of mixed acids (Ն10 mM). This high level of organic acid production, as well as variable compositions of the acid mixture, has been documented in the model organisms A. niger and Penicillium bilaiae due to varying substrate C and N sources (3,36,39).…”

Section: Discussionmentioning

confidence: 75%

“…Soil fungi have been recognized recently as potentially significant contributors to the mobilization of heavy metals by means of organic acid production in contaminated soils (2,3) and lowgrade mining ore (36) in a process often termed bioleaching. Fungal production of low-molecular-weight organic acids (LMWOAs) has been almost exclusively studied in model organisms, such as Aspergillus spp.…”

mentioning

confidence: 99%

“…Fungal production of low-molecular-weight organic acids (LMWOAs) has been almost exclusively studied in model organisms, such as Aspergillus spp. (2,3,16,27,36,39,56). Despite the fact that it is a process that may contribute significantly to Pb mobilization in soils, no thorough studies of these processes in indigenous soil fungi have been reported.…”

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confidence: 99%

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Firing Range Soils Yield a Diverse Array of Fungal Isolates Capable of Organic Acid Production and Pb Mineral Solubilization

Sullivan

Gottel

Basta

et al. 2012

Appl Environ Microbiol

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e Anthropogenic sources of lead contamination in soils include mining and smelting activities, effluents and wastes, agricultural pesticides, domestic garbage dumps, and shooting ranges. While Pb is typically considered relatively insoluble in the soil environment, some fungi may potentially contribute to mobilization of heavy metal cations by means of secretion of low-molecularweight organic acids (LMWOAs). We sought to better understand the potential for metal mobilization within an indigenous fungal community at an abandoned shooting range in Oak Ridge, TN, where soil Pb contamination levels ranged from 24 to >2,700 mg Pb kg dry soil ؊1 . We utilized culture-based assays to determine organic acid secretion and Pb-carbonate dissolution of a diverse collection of soil fungal isolates derived from the site and verified isolate distribution patterns within the community by 28S rRNA gene analysis of whole soils. The fungal isolates examined included both ascomycetes and basidiomycetes that excreted high levels (up to 27 mM) of a mixture of LMWOAs, including oxalic and citric acids, and several isolates demonstrated a marked ability to dissolve Pb-carbonate at high concentrations up to 10.5 g liter ؊1 (18.5 mM) in laboratory assays. Fungi within the indigenous community of these highly Pb-contaminated soils are capable of LMWOA secretion at levels greater than those of well-studied model organisms, such as Aspergillus niger. Additionally, these organisms were found in high relative abundance (>1%) in some of the most heavily contaminated soils. Our data highlight the need to understand more about autochthonous fungal communities at Pb-contaminated sites and how they may impact Pb biogeochemistry, solubility, and bioavailability, thus consequently potentially impacting human and ecosystem health.

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Section: Discussionmentioning

confidence: 75%

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confidence: 99%

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Firing Range Soils Yield a Diverse Array of Fungal Isolates Capable of Organic Acid Production and Pb Mineral Solubilization

Sullivan

Gottel

Basta

et al. 2012

Appl Environ Microbiol

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“…Substrates undergo microbial oxidation during growth studies of G. lucidum which resulted in the production of organic acids including citric, oxalic, tartaric and malic acids that play a fundamental role in the environmental mobility of metal ions (Sayer and Gadd, 2001;Mulligan et al, 2004;Xu and Ting, 2009). Some of these acids act as complexing agents for metal ions.…”

Section: Organic Acids Produced By G Lucidummentioning

confidence: 99%

“…Acidolysis, redoxolysis and complexolysis are the principal mechanisms in bioleaching of metals by fungi. The fungus produces organic acids such as citric, oxalic, malic and gluconic acids during bioleaching (Mulligan et al, 2004;Johnson, 2006). Most active leaching fungi which have been isolated and used are from the genera Penicillium and Aspergillus (Burgstaller and Schinner, 1993).…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of copper, aluminum, magnesium and manganese from brown shale by Ganoderma lucidum

Nouren¹,

Bhatti²,

Ilyas³

2011

Afr. J. Biotechnol.

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The present study was done to check the bioleaching feasibility of brown shale for the recovery of copper (Cu), aluminum (Al), magnesium (Mg) and manganese (Mn) ions using Ganoderma lucidum. Different experimental parameters were optimized for the enhanced recovery of metals ions. Effect of different substrates like glucose, molasses, saw dust and cotton seed cake on the recovery of metals ions was investigated under shaking as well as non-shaking conditions. Significant difference in leaching of metal ions by G. lucidum was observed under shaking and non shaking conditions. Maximum leaching of Al (90.7%), Mg (96.46%), Mn (66.3%) and Cu (73.45%) was observed using glucose under shaking conditions with 5, 3, 4 and 3% pulp densities respectively. The results show that maximum solubilization up to 68.89, 77.03 and 38.37% was achieved for Cu, Al and Mg ions respectively using molasses as substrate, whereas, 57.74% recovery of Mn was achieved with saw dust. The recovery of metal ions indicated that this low grade discarded ore may be a potential source of metal ions in future.

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Environmental Processing of Zn Containing Wastes and Generation of Nanosized Value‐Added Products

Abhilash

Pandey

2015

Bio‐Nanoparticles

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Bioleaching of heavy metals from a low-grade mining ore using Aspergillus niger

Cited by 148 publications

References 9 publications

Firing Range Soils Yield a Diverse Array of Fungal Isolates Capable of Organic Acid Production and Pb Mineral Solubilization

Firing Range Soils Yield a Diverse Array of Fungal Isolates Capable of Organic Acid Production and Pb Mineral Solubilization

Bioleaching of copper, aluminum, magnesium and manganese from brown shale by Ganoderma lucidum

Environmental Processing of Zn Containing Wastes and Generation of Nanosized Value‐Added Products

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