Loading...

Optimized bioleaching of copper by indigenous cyanogenic bacteria isolated from the landfill of e-waste

Arab, B ; Sharif University of Technology | 2020

1022 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.jenvman.2020.110124
  3. Publisher: Academic Press , 2020
  4. Abstract:
  5. In this study, indigenous cyanogenic bacterial strains were isolated on nutrient, minimal salt, and soil extract media at various culture conditions from two distinct landfills of e-waste, Iran. Based on their cyanide formation profiles, five most potent isolates were selected for optimization and to this end, the influence of the most effective factors on cyanide production including pH, glycine concentration and temperature were assessed using one-factor at a time method (OFAT). Initial pH of 7, glycine concentration of 2 g/L and temperature of 30°C were obtained as optimal conditions for most of the isolates. Additionally, two bioleaching processes were applied for each bacteria to detect the effect of optimal conditions on bioleaching and to assay their potential in the mobilization of copper. Under optimal conditions and pulp density of 1 g/L, copper recoveries were recorded as 96.73%, 82.49%, 81.17%, 41.72%, and 31.52% by S22, N13, N37, N23, and N41 respectively during 10 days which is approximately 1.5–5 times higher than the recovery obtained without optimization. During the optimization and the bioleaching process, the pH fluctuation of the flasks was monitored which validated the activity of the microorganisms. © 2020 Elsevier Ltd
  6. Keywords:
  7. Bioleaching ; Copper ; E-waste ; Indigenous cyanogenic bacterial strains ; Optimization ; Copper ; Cyanide ; Glycine ; Bacterium ; Bioremediation ; Copper ; Cyanide ; Electronic waste ; Landfill ; Leaching ; Mobilization ; Optimization ; Soil pollution ; Temperature profile ; Article ; Bacillus megaterium ; bacterial cell ; Bacterial growth ; Bacterial strain ; Bacterium colony ; Bacterium isolate ; Bioleaching ; Comparative study ; Controlled study ; Cyanogenesis ; E-waste ; Landfill ; Nonhuman ; Oxygen concentration ; Oxygen consumption ; PH ; PH measurement ; Temperature ; Volatilization ; Bacterium ; Iran ; Waste disposal facility ; Iran ; Bacteria (microorganisms) ; Bacteria ; Copper ; Electronic Waste ; Hydrogen-Ion Concentration ; Iran ; Waste Disposal Facilities
  8. Source: Journal of Environmental Management ; Volume 261 , 2020
  9. URL: https://www.sciencedirect.com/science/article/pii/S0301479720300621