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Application of Bioleaching Technology in Extraction of Metals from Spent Catalysts of Petroleum Refinery

Amiri, Farnaz | 2011

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 42487 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheyla; Mousavi, Mohammad
  7. Abstract:
  8. In this project, bioleaching has been investigated as a solution for detoxification and metal recovery of spent hydrocracking catalysts of Tehran petroleum refinery which is listed as a hazardous waste. In this project four stages has been accomplished as follows: 1- Adaptation of Penicillium simplicissimum and Aspergillus niger with different heavy metals present in a spent hydrocracking catalyst, individually and with mixture of metals as well as adaptation by spent catalyst which the cumulative action of multi-metals enhanced the toxic effect; 2- The one-step, two-step, and spent medium bioleaching of the spent catalyst by the adapted fungi in batch cultures were investigated and compared. A total of 3% (w/v) spent catalyst generally gave the maximum extraction yields in the two-step bioleaching process by Penicillium simplicissimum; 3- The statistically based experimental designs to screen and optimize the bioleaching of Ni/Mo spent hydrocracking catalyst by Penicillium simplicissimum and Aspergillus niger were applied; 4- The growth kinetics of the fungi in the presence of the spent catalyst at various pulp densities at optimal condition was modeled using the modified Gompertz model. The kinetic parameters in the system were estimated using MATLAB R2008a. Results showed that the modified Gompertz model fit the experimental data well. The relationship between the specific growth rate and pulp density was found by modifying the Luong inhibition model. A modified form of shrinking core model was used to take the variation of organic acid concentration into account. The predictions by the model showed good consistency with the experimental data, and suggested that diffusion through the solid matrix was the rate–controlling step
  9. Keywords:
  10. Bioleaching ; Aspergillus Niger ; Optimization ; Penicillium Simplicissimum ; Rate Controlliny Step ; Fungal Growth Kinetics ; Spent Catalyst

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