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Study of plastics elimination in bioleaching of electronic waste using Acidithiobacillus ferrooxidans

Arshadi, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s13762-018-2120-1
  3. Publisher: Center for Environmental and Energy Research and Studies , 2019
  4. Abstract:
  5. Polystyrene, acrylonitrile butadiene styrene, and polypropylene are the main polymers in E-waste, existing about 31%, 16%, and 13%, respectively. In this research, the effects of the elimination of low-density materials (such as polymers and plastics) were studied using the shaking table method. Bioleaching of Cu and Ni against the original sample (Sample #1) and pre-treated sample without low-density materials (Sample #2) was compared. The amount of bioleached metals and growth characteristics (including pH, Eh, bacterial count) was investigated within 25 days. The analysis of Sample #1 showed that at pulp density of 15 g/l, 94% and 79% of Cu and Ni were recovered maximally, respectively, on 14th day. By using Sample #2, the recovery of Cu and Ni decreased to 87% and 74%, respectively, on 6th day. Chemical characteristics (including recovery, X-ray diffraction, X-ray fluorescence, Fourier transform infrared spectroscopy, and field emission scanning electron microscope) before and after bioleaching of both E-waste samples confirmed that bioleaching was quite effective. This paper proved the great potential of the bio-hydrometallurgical route to recover heavy metals from electronic wastes, in which recovery of Cu and Ni is higher in the presence of low-density materials. © 2018, Islamic Azad University (IAU)
  6. Keywords:
  7. Cu recovery ; Low-density materials ; Polymer ; Toxicity assessments ; ABS resins ; Bioleaching ; Electronic equipment ; Fourier transform infrared spectroscopy ; Heavy metals ; Metal recovery ; Polymers ; Polypropylenes ; Scanning electron microscopy ; Styrene ; Wastes ; Acidithiobacillus ferrooxidans ; Acrylonitrile butadiene styrene ; Chemical characteristic ; Field emission scanning electron microscopes ; Growth characteristic ; Ni recovery ; Toxicity assessment ; Electronic Waste ; Bioremediation ; Ecotoxicology ; Leaching ; Nickel ; Plastic ; Pollutant removal ; Elastomers ; Bacteria (microorganisms)
  8. Source: International Journal of Environmental Science and Technology ; Volume 16, Issue 11 , 2019 , Pages 7113-7126 ; 17351472 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s13762-018-2120-1