Heavy Metal Immobilization Potential of Indigenous Bacteria Isolated from Gold Mine Tailings

Fashola, Muibat Omotola; Ngole‐Jeme, Veronica M.; Babalola, Olubukola Oluranti

doi:10.1007/s41742-019-00240-6

Cited by 31 publications

(21 citation statements)

References 54 publications

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“…Unique fungal diversity was identified in various HM-contaminated sites [ 24 , 31 , 43 , 44 , 87 , 88 ]. Similar investigations on bacterial populations reflect the same results [ 56 , 89 , 90 , 91 ]. These studies emphasize the need to investigate and make use of microorganism consortia adapted to the particular conditions of each location.…”

Section: Discussionsupporting

confidence: 85%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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Filamentous fungi native to heavy metals (HMs) contaminated sites have great potential for bioremediation, yet are still often underexploited. This research aimed to assess the HMs resistance and Hg remediation capacity of fungi isolated from the rhizosphere of plants resident on highly Hg-contaminated substrate. Analysis of Hg, Pb, Cu, Zn, and Cd concentrations by X-ray spectrometry generated the ecological risk of the rhizosphere soil. A total of 32 HM-resistant fungal isolates were molecularly identified. Their resistance spectrum for the investigated elements was characterized by tolerance indices (TIs) and minimum inhibitory concentrations (MICs). Clustering analysis of TIs was coupled with isolates’ phylogeny to evaluate HMs resistance patterns. The bioremediation potential of five isolates’ live biomasses, in 100 mg/L Hg2+ aqueous solution over 48 h at 120 r/min, was quantified by atomic absorption spectrometry. New species or genera that were previously unrelated to Hg-contaminated substrates were identified. Ascomycota representatives were common, diverse, and exhibited varied HMs resistance spectra, especially towards the elements with ecological risk, in contrast to Mucoromycota-recovered isolates. HMs resistance patterns were similar within phylogenetically related clades, although isolate specific resistance occurred. Cladosporium sp., Didymella glomerata, Fusarium oxysporum, Phoma costaricensis, and Sarocladium kiliense isolates displayed very high MIC (mg/L) for Hg (140–200), in addition to Pb (1568), Cu (381), Zn (2092–2353), or Cd (337). The Hg biosorption capacity of these highly Hg-resistant species ranged from 33.8 to 54.9 mg/g dry weight, with a removal capacity from 47% to 97%. Thus, the fungi identified herein showed great potential as bioremediators for highly Hg-contaminated aqueous substrates.

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Section: Discussionsupporting

confidence: 85%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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“…Adewole and Adesina [ 7 ] posited that mining activities and mine waste generation, in addition to enriching soils with heavy metal (HM), could also affect nutrient dynamics in soils because of dynamic and interaction changes in physical, chemical, and microbiological processes. Several studies [ 8 , 9 ] have highlighted the importance of soil parameters such as organic matter (OM), particle size distribution, clay content, redox potential, electrical conductivity (EC), moisture content, cation exchange capacity (CEC), and pH on heavy metal behavior in soils. Fashola et al [ 9 ] maintained that metal mobility was found to be lower in fine-textured soils than in coarse-textured soils, particularly when the clayey soil’s mineralogical composition is dominated by 2:1 tetrahedral: octahedral silicate clay minerals.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies [ 8 , 9 ] have highlighted the importance of soil parameters such as organic matter (OM), particle size distribution, clay content, redox potential, electrical conductivity (EC), moisture content, cation exchange capacity (CEC), and pH on heavy metal behavior in soils. Fashola et al [ 9 ] maintained that metal mobility was found to be lower in fine-textured soils than in coarse-textured soils, particularly when the clayey soil’s mineralogical composition is dominated by 2:1 tetrahedral: octahedral silicate clay minerals. Acidic circumstances lower soil exchange capabilities of metal cations and increase metal solubility in the soil environment, making them more mobile, but a high level of organic matter can enhance metal adsorption, reducing mobility in the environment as emphasized by Ayangbenro et al [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical and molecular characterization of heavy metal–tolerant bacteria isolated from soil of mining sites in Nigeria

Ibrahim

Kawo

Yusuf

et al. 2021

Journal of Genetic Engineering and Biotechnology

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Background Mining for precious metals is detrimental to the composition of soil structure and microbial diversity distribution and is a health risk to human communities around the affected communities. This study was aimed at determining the physical and chemical characteristics and diversity of bacteria in the soil of local mining sites for biosorption of heavy metals. Results Results of physical and chemical characteristics showed mean pH values and percentage organic carbon to range from 7.1 to 8.2 and 0.18 to 1.12% respectively with statistical significance between sampling sites (P ≤ 0.05). Similarly, cation exchange capacity, electrical conductivity, moisture, total nitrogen, and carbon/nitrogen ratio (C:N) in the soil ranged between 1.52 to 3.57 cmol/kg, 0.15 to 0.32 ds/m, 0.14 to 0.82%, 0.10 to 0.28%, and 1.7 to 4.8 respectively. The highest heavy metal concentration of 59.01 ppm was recorded in soils obtained from site 3. The enumeration of viable aerobic bacteria recorded the highest mean count of 4.5 × 106 cfu/g observed at site 2 with statistical significance (P ≤ 0.05) between the sampled soils. Alcaligenes faecalis strain UBI, Aeromonas sp. strain UBI, Aeromonas sobria, and Leptothrix ginsengisoli that make up 11.2% of total identified bacteria were able to grow in higher amended concentrations of heavy metals. The evolutionary relationship showed the four heavy metal–tolerant bacteria identified belonged to the phylum Proteobacteria of class Betaproteobacteria in the order Burkholderiales. Heavy metal biosorption by the bacteria showed Alcaligenes faecalis strain UBI having the highest uptake capacity of 73.5% for Cu. Conclusion In conclusion, Alcaligenes faecalis strain UBI (MT107249) and Aeromonas sp. strain UBI (MT126242) identified in this study showed promising capability to withstand heavy metals and are good candidates in genetic modification for bioremediation.

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“…The microbial pathway is based on the use of sulfates as electron acceptors during anaerobic redox processes (Chen et al, 2016; Pallud and Van Cappellen, 2006; Tuttle et al, 1969). Heterotrophic consortia reduce sulfates into H 2 S, which in its turn is used to immobilize metallic cations by precipitating as sulfides (Diez-Ercilla et al, 2018; Fashola et al, 2019). This type of cascade process is common in AMD where rehabilitation objectives consist in immobilizing both sulfates and heavy metals (Fan et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Over-sulfated soils and sediments treatment: A brief discussion on performance disparities of biological and non-biological methods throughout the literature

Ahmat

Mamindy-Pajany

2021

Waste Manag Res

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High sulfate concentrations in industrial effluents as well as solid materials (excavated soils, dredged sediments, etc.) are a major hindrance for circular economy outlooks. SO42- acceptability standards are indeed increasingly restrictive, given the potential outcomes for public health and ecosystems. This literature review deals with the treatment pathways relying on precipitation, adsorption and microbial redox principles. Although satisfactory removal performances can be achieved with each of them, significant yield differences are displayed throughout the bibliography. The challenge here was to identify the parameters leading to this variability and to assess their impact. The precipitation pathway is based on the formation of two main minerals (ettringite and barite). It can lead to total sulfate removal but can also be limited by aqueous wastes chemistry. Stabilizer kinetics of formation and equilibrium are highly constrained by background properties such as pH, Eh, SO42- saturation state and inhibiting metal occurrences. Regarding the adsorption route, sorbents’ intrinsic features such as the qmax parameter govern removal yields. Concerning the microbial pathway, the chemical oxygen demand/SO42- ratio and the hydraulic retention time, which are classically evoked as yield variation factors, appear here to be weakly influential. The effect of these parameters seems to be overridden by the influence of electron donors, which constitute a first order factor of variability. A second order variability can be read according to the nature of these electron donors. Approaches using simple monomers (ethanol lactates, etc.) perform better than those using predominantly ligneous organic matter.

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Heavy Metal Immobilization Potential of Indigenous Bacteria Isolated from Gold Mine Tailings

Cited by 31 publications

References 54 publications

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Physicochemical and molecular characterization of heavy metal–tolerant bacteria isolated from soil of mining sites in Nigeria

Over-sulfated soils and sediments treatment: A brief discussion on performance disparities of biological and non-biological methods throughout the literature

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