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Some Studies on Ability of Aspergillus Niger Mould in Recovery of Heavy Metals from Crude Oil Sludge.

Anahid, Sanaz | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40026 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila
  7. Abstract:
  8. This study focused on the tolerance of fungi strains including Aspergillus niger, Aspergillus foetidus and Penicillium for different metals (Ni, Co, Mo, V, Mn, Mg, Fe, W and Zn ). Then Aspergillus niger was exposed to mixture of Mo, V and Mn (at a mass ratio of 1:2:6 as approximately present in the spent refinery processing catalyst). The degree of tolerance was measured from the growth rate in the presence of various metals and compared to a control which contained no metals. Effect of type of strains, type of metal and metal concentration on adaptive tolerance of fungus was evaluated. Adaptation experiments with single metals showed Aspergillus niger tolerated up to 1000 mg/l Ni, Zn, 1500 mg/l Co, 2000 mg/l Fe, 5000 mg/l Mo, V, Mn, W and Mg and in the presence of a mixture metals(Mo, V, Mn) fungi could tolerate up to 500 mg/l Mo, 1000 mg/l V and 3000 mg/l Mn. Aspergillus foetidus tolerated up to 500 mg/l Ni, Co and Zn, 3500 mg/l Fe, Mn and W, 5000 mg/l Mo,V and Mg. Penicillium tolerated up to1500 mg/l Ni, 2500 mg/l Co and Fe, 6000 mg/l Mn, 8000 mg/l Mo, V, Mg, W and Zn. Results showed that Ni was one of the most toxic metal for strains of Aspergillus and Penicillium. Aspergillus foetidus was the least tolerant in particular for Ni, Co and Zn. In this investigation Aspergillus niger, Aspergillus foetidus and Penicillium showed higher tolerance towards Mo and V and these fungus have good potential for bioleaching of spent refinery processing catalysts contain Mo and V
  9. Keywords:
  10. Bioleaching ; Adaptation ; Tolerance ; Heavy Metals

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