Biosorption of Heavy Metals by Pseudomonas aeruginosa Isolated from a Petroleum Contaminated Site

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The study describes the sorption of Cr, Cu, Mn and Zn by Pseudomonas aeruginosa AT18 isolated from a site contaminated with petroleum and heavy metals. The concentrations studied (mgL-1) were Cr-50, Cu-49, Mn-60 and Zn-70. The solution pH and ionic strength were very important factors in the metal biosorption performance and the biosorption capacity of Pseudomonas aeruginosa AT18 for Cr3+ Cu2+, Mn2+ and Zn2+. In aqueous solution the biosorption increased with increasing pH in the range 5.46-7.72. The results obtained in the experimental assays show that Pseudomonas aeruginosa AT18 has the capacity for biosorption of the metallic ions Cr3+, Cu2+ and Zn2+ in solutions, although its capacity for the sorption of manganese is low (22.39 mg Mn2+/g of biomass) in comparison to the Cr3+, Cu2+ and Zn2+ ions, as shown by the individual analyses. However, 20% of the manganese was removed from an initial concentration of 49.0 mgL- 1, with a Qm value similar to that obtained in solutions containing mixtures of Cr3+ Cu2+, Mn2+ and Zn2+. The chromium level sorbed by Pseudomonas aeruginosa AT18 biomass was higher than that for Cu, Mn and Zn, with 100% removal in the pH range 7.00-7.72 and a Qm of 121.90-200.00 mg of Cr3+/g of biomass. The remove of Cr, Cu and Zn are a result also of precipitation processes.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Edited by:

Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher

Pages:

615-618

Citation:

R. M. Pérez et al., "Biosorption of Heavy Metals by Pseudomonas aeruginosa Isolated from a Petroleum Contaminated Site", Advanced Materials Research, Vols. 20-21, pp. 615-618, 2007

Online since:

July 2007

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$38.00

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[20] [40] [60] [80] 100 3, 09 5, 46 6, 25 7 pH Removal of Cu(II) (%).

[20] [40] [60] [80] 100 qm (mg/g biomass) qm.

[20] [40] [60] [80] 100 3, 09 5, 46 6, 25 7 7, 72 pH Removal of Zn(II) (%).

[20] [40] [60] [80] 100 3, 09 qm (mg/g biomass) qm.

[20] [40] [60] [80] 100 3, 09 5, 46 6, 25 7 7, 72 pH Removal of Mn(II) (%).

[10] [20] [30] qm (mg/g biomass) qm.

[20] [40] [60] [80] 100 120 3, 09 5, 46 6, 25 7 7, 72 pH Removal of Cr(III) (%).

[50] 100 150 200 250qm (mg/g biomass) qm.