Removal of thorium from simulated acid process streams by fungal biomass

Gadd, Geoffrey Michael; White, C

doi:10.1002/bit.260330512

Cited by 107 publications

(37 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Biosorption and bioaccumulation are processes by which microorganisms remove metal ions from solutions and industrial effluents [11,[35][36][37]. Aspergillus mycelia have particularly been found to be efficient for removing zinc and thorium from solutions and polluted water [38,39]. In this study A. parasiticus had significantly (P<0.001) higher cellular Cr(VI) concentration (587.56 ± 47.17 µg/g) compared to A. niger (82.12 ± 3.45 µg/g) at the highest Cr(VI) treatment (20 mg/l).…”

Section: Resultsmentioning

confidence: 99%

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Shugaba¹,

Buba²,

Bg³

et al. 2012

J Pet Environ Biotechnol

View full text Add to dashboard Cite

The uptake and reduction of Cr(VI) by Aspergillus niger and A. parasiticus was studied in this journal. After 96 hours of growth, the culture solutions spiked with an initial dichromate concentration of 20 mg/l, were completely decolorized and had residual Cr(VI) concentrations of only 0.74 ± 0.55 and 1.69 ± 0.29 mg/l in A. niger and A. parasiticus cultures representing Cr(VI) removal of 96.3% and 91.6%, respectively. In the A. niger culture, significantly (P < 0.01) lower Cr(VI) concentrations were observed within 72 hours of growth compared to those of A. parasiticus, but in both cultures complete removal was almost achieved by 144 hours of growth. The rate of Cr(VI) removal was 0.21 ± 0.09 mgl -1 hr -1 and 0.20 ± 0.07 mgl -1 hr -1 for A. niger and A. parasiticus, respectively. Cellular concentrations of Cr(VI) in the two fungi increased significantly (P < 0.05 -0.001) with increasing concentrations of the dichromate treatments. Although tannic acid as sole source of carbon and energy gave significantly lower Cr(VI) removal than glucose (P < 0.001) and acetate (P < 0.01), it supported the removal of about 85.0% and 68.8% of the metal ion by A. niger and A. parasiticus, respectively. The active mycelia of both fungi showed significantly (P < 0.001) higher Cr(VI) removal than inactivated mycelia after incubation at 30°C for 72 hours. Incubation of cell -free extracts of both fungi with NADH at 30°C for 2 hours showed Cr(VI) reduction of 68.0% and 55.5% for A. niger and A. parasiticus, respectively. These findings suggest that uptake and metabolic reduction may be the process by which the two fungi are able to tolerate the toxic effects of hexavalent chromium. However, Cr removal via uptake by the two fungal biomass was observed to be in the range of 0.5 -1.78% only, for all the concentrations applied, which is insignificant when compared with the initial Cr concentration in the culture medium. The results obtained through this investigation indicate the possibility of treating waste effluents containing hexavalent chromium using Aspergillus niger and A. parasiticus.

show abstract

Section: Resultsmentioning

confidence: 99%

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Shugaba¹,

Buba²,

Bg³

et al. 2012

J Pet Environ Biotechnol

View full text Add to dashboard Cite

show abstract

“…The main site of actinide uptake is the cell wall (Weidemann et al, 1981;Tsezos et al, 1986;Volesky, 1990), although permeabilization of cells with carbonates or detergents can increase uptake, indicating that intracellular sites are also capable of binding metals (Gadd & White, 1989c). The mecbanism of biosorption varies between elements.…”

Section: Biosorption Of Radionuclides By Fungal Biomassmentioning

confidence: 99%

“…Such precipitation has also been observed for thorium (Tsezos, 1986;Gadd & White, 1989a, b). Under some conditions, thorium may also accumulate intracellularly in 5. cerevisiae with preferential localization in the vacuole (Gadd & White, 1989c).…”

Section: Biosorption Of Radionuclides By Fungal Biomassmentioning

confidence: 99%

Interactions of fungi with toxic metals

1993

Self Cite

View full text Add to dashboard Cite

SUMMARY This review details the major interactions of fungi with toxic metal species. Physico‐chemical and biological aspects are discussed including definitions and classification of metals in biological contexts, mechanisms of metal fungitoxicity, resistance and tolerance, environmental influences and the occurrence of fungi in metal‐polluted habitats. Cellular interactions include extracellular precipitation and complexation, binding to cell walls, transport of monovalent and divalent metal cations, intracellular fates of toxic metal species (including metal‐binding proteins and peptides, and vacuolar compartmentation), and metal transformations including organometal(loid) synthesis. Significant interactions between metals and mycorrhizal fungi and macrofungi are summarized with reference to the amelioration of plant phytotoxicity and metal accumulation respectively. Biotechnological aspects of metal‐fungal interactions relate to the biological treatment of metal‐contaminated effluents and waste streams for metal removal/recovery and environmental protection.

show abstract

“…Several researchers have reported that the biosorptive capacity of heat-inactivated cells might be greater, equivalent to or less than that of living cells [5,6]. However, the use of heat-inactivated biomass in industrial applications may offer some advantages (such as being less sensitive to heavy metal ion concentrations and adverse operating conditions) over the use of living cells [7].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Heavy Metal Biosorption Capacity of Active, Heat‐Inactivated and NaOH‐Treated Phanerochaete chrysosporium Biosorbents

Gürişik

Arıca

Bektaş³

et al. 2004

Engineering in Life Sciences

View full text Add to dashboard Cite

Three different kinds of Phanerochaete chrysosporium (NaOH‐treated, heat‐inactivated and active) biosorbent were used for the removal of Cd(II) and Hg(II) ions from aquatic systems. The biosorption of Cd(II) and Hg(II) ions on three different forms of Phanerochaete chrysosporium was studied in aqueous solutions in the concentration range of 50–700 mg/L. Maximum biosorption capacities of NaOH‐treated, heat‐inactivated and active Phanerochaete chrysosporium biomass were found to be 148.37 mg/g, 78.68 mg/g and 68.56 mg/g for Cd(II) as well as 224.67 mg/g, 122.37 mg/g and 88.26 mg/g for Hg(II), respectively. For Cd(II) and Hg(II) ions, the order of affinity of the biosorbents was arranged as NaOH‐treated > heat‐inactivated > active. The order of the amount of metal ions adsorbed was established as Hg(II) > Cd(II) on a weight basis, and as Cd(II) > Hg(II) on a molar basis. Biosorption equilibriums were established in about 60 min. The effect of the pH was also investigated, and maximum rates of biosorption of metal ions on the three different forms of Phanerochaete chrysosporium were observed at pH 6.0. The reusability experiments and synthetic wastewater studies were carried out with the most effective form, i.e., the NaOH‐treated Phanerochaete chrysosporium biomass. It was observed that the biosorbent could be regenerated using 10 mM HCl solution, with a recovery of up to 98%, and it could be reused in five biosorption‐desorption cycles without any considerable loss in biosorption capacity. The alkali‐treated Phanerochaete chrysosporium removed 73% of Cd(II) and 81% of Hg(II) ions from synthetic wastewater.

show abstract

Removal of thorium from simulated acid process streams by fungal biomass

Cited by 107 publications

References 15 publications

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Interactions of fungi with toxic metals

Comparison of the Heavy Metal Biosorption Capacity of Active, Heat‐Inactivated and NaOH‐Treated Phanerochaete chrysosporium Biosorbents

Contact Info

Product

Resources

About