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Feasibility Study on Isolation of Native Microorganism for Bioleaching of Electronic Waste

Gheshlaghi, Mahraz | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49593 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila
  7. Abstract:
  8. Accumulation of electronic wastes in the environment is one of the recent ecological problems. This type of wastes contain metallic and non-metallic elements which can contaminate the environment. On the other hand due to the high volume of precious and basic metals within e-waste, it could be considered as a secondary resource. Bioleaching is a suitable method for the recovery of metals from e-waste which, on the contrary to the conventional recycling methods in the industry, is both economically and ecologically efficient. The aim of this research is the isolation of native micro-organism and evaluating its ability in recovering copper from a mixture of computer, cellphone, fax and copy machines-printed circuit boards using bioleaching method. Another goal of this research is optimization of effective parameters in the process in order to maximize copper recovery. For this reason, first of all native micro-organism was isolated from Zanjan mine soil. Afterwards its adaptation ability to the mixture of printed circuit boards was evaluated via serial sub-culturing method. Finally, other parameters such as temperature, pulp density, initial Fe2+ concentration were evaluated using response surface method (RSM). Native micro-organism is a bacillus, acidophile, mesophile, gram negative bacteria which uses ferro-ion oxidation in order to supply energy. The micro-organism is able to adapt to 12 (g/l) mixture of printed circuit boards and given the optimum temperature of 31.4(℃), pulp density of 9.4 (g/l) and initial Fe2+ concentration of 7.3(g/l) is able to recover 92 percent copper from such mixture
  9. Keywords:
  10. Optimization ; Electronic Waste ; Adaptation ; Bioleaching ; Response Surface Methodology ; Indigenous Microorganism

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