Investigation of Bioleaching Extraction of Heavy Metals from Spent Catalyst in a Bioreactor

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Shahrabi Farahani, Mohammad | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42479 (06)
University: Sharif University of technology
Department: Chemical and Petroleum Engineering
Advisor(s): Yaghmaei, Soheyla; Mousavi, Mohammad
Abstract:
Recovery of heavy metals from Hydrocracking spent catalyst was studied in a bioreactor by Acidithiobacillus thiooxidans. At first adaptation of microorganisms was done with spent catalyst in shaker flask. Using central composite design (CCD) the experiments were conducted in order to find optimized condition. Three factors such as particle size, pulp density and aeration rate were examined. Reduced cubic models were established to identify the relationship between the recovery percent of the metals and the variables. The results showed the maximum extraction of 87% Mo, 37% Ni and 15% Al were achieved after 7 days of batch process in bioreactor. The optimal values of variables were pulp density (0.9%), particle size (60.7 m) and aeration rate (209 ml/min). The recovery of these metals decreases the environmental impact of the waste catalyst and the recycled product can be further used for industrial purposes
Keywords:
Bioleaching ; Bioreactor ; Spent Catalyst

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