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Study of Ability of Adapted Microorganisms in Bioleaching of Electronic Wastes

Nili, Sheida | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51532 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmae, Soheila
  7. Abstract:
  8. Among all electornical wastes, printed circuit boards (PCBs) of mobile phones and computers has more share than other e-wastes. E-wastes contains toxic and maybe worthable metals like copper, nickel, gold, silvet and etc. In this project, ability of Penicillin Simplicissimum in bio-leaching of copper and nickle in mobile phones PCBs, is studied. Daily production of this kind of e-wastes, requires an industrialized and economical method to help the environment. At the first step of this project, the fungi was adapted to e-waste. Then, optimization of pH and number of spores in inoculum of bioleaching by Penicillin Simplicissimum in non-conventional mediums (sugar, cheese water and molasses) instead of main carbon source in medium (sucrose) was experimented. According to optimized condition, recovery of Cu in sucrose, sugar, cheese water and molasses respectively was 93.3%, 84.3%, 79.4% and 73.1% and recovery of Ni was 92%, 57.7%, 69.9% and 69.4%. This amount is recovered in neutral pH of medium with 106 spores in inoculum. All of these experiments in this stage of project were done to find the optimal conditions in bioreactor. To optimized the conditions in bioreactor with 3 numerical factors: amount of powder of mobile phone waste, amount of aeration and molasses concentreation. After all experiments, the highest recovery of Cu was in a bioreactor contains 10 g/lit powder of e-waste, 0.29 lit/min aeration and 8.8% (V-V) molasses concentration and for Ni was in a bioreactor contains 10 g/lit e-waste, 0.37 lit/min aeration and 1.9% (V-V) molasses concentration. The recovery of Cu under optimized condition was 96.94% and for Ni was 71.51%
  9. Keywords:
  10. Bioleaching ; Penicillium Simplicissimum ; Bioreactor ; Printed Circuit Board ; Electronic Waste ; Mobile Telephony

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