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Bioleaching of Metal from Electronic Waste by Heterotroph Fungus

Esmaeili, Alireza | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50982 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila; Mousavi, Mohammad
  7. Abstract:
  8. In the recent years, the world has been faced with a spectacular increase in variety and usage of electronic and electric devices. Unfortunately, the highly increasing march of technology reduces the time of their usage, causing a high degree of electric and electronic waste. Nonetheless, these E-waste enjoys a high percentage in precious metals such as Cadmium, Copper, Nickle, Zinc, Barium, Beryllium, Aluminum, Gold, Silver, Platinum, and so forth. With this in mind, they can be named as “secondary mines”, enjoying higher in degree of these metals even than natural mines. Therefore, extraction and recovery of the very metals are of great importance. Nowadays, using microorganisms in order to do so has gained a lot of attention, since their simplicity of usage, compatibility with the environment, as well as being economical. In this piece of research, mobile phone and computer printed circuit boards, one of the greatest part of the E-waste, have been investigated using Aspergilus niger and Penicillium simplicissimum for fungal bioleaching of the metals of Copper, Nickle, Aluminum, and Zinc. Each of these two fungies has been adapted with mobile phone and computer printed circuit boards up to 4 percent (weight/volume percentage). Afterwards, by using Response Surface Methodology to design experiment, the design was engineered in two steps. In the first stage, the parameters of pH, pulp density and sucrose concentration in the environment were investigated using adapted Penicillium simplicissimum. Under the optimized conditions, the recovery of Copper, Nickle, and Aluminum were altered to 100, 97.52, and 70.18 percent, respectively. In the next stage, the parameters of pH, pulp density, and fungal type were under investigation. According to this investigation, the optimized conditions for Aspergilus niger and Penicillium simplicissimum were discovered. Under the very conditions, the recovery of Copper, Nickle, and Zinc became 100, 100, and 74.54 percent for the former, and 91.83, 97.49, and 77.17 percent for the latter, respectively
  9. Keywords:
  10. Bioleaching ; Electronic Waste ; Aspergillus Niger ; Penicillium Simplicissimum ; Optimization ; Response Surface Methodology

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