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Bioleaching of tungsten-rich spent hydrocracking catalyst using Penicillium simplicissimum

Amiri, F ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.biortech.2010.08.087
  3. Publisher: 2011
  4. Abstract:
  5. Adaptation of Penicillium simplicissimum with different heavy metals present in a spent hydrocracking catalyst, as well as one-step, two-step, and spent medium bioleaching of the spent catalyst by the adapted fungus, was examined in batch cultures. Adaptation experiments with the single metal ions Ni, Mo, Fe, and W showed that the fungus could tolerate up to 1500. mg/L Ni, 8000. mg/L Mo, 3000. mg/L Fe, and 8000. mg/L W. In the presence of multi-metals, the fungus was able to tolerate up to 300. mg/L Ni, 200. mg/L Mo, 150. mg/L Fe and 2500. mg/L W. A total of 3% (w/v) spent catalyst generally gave the maximum extraction yields in the two-step bioleaching process (100% of W, 100% of Fe, 92.7% of Mo, 66.43% of Ni, and 25% of Al). The main lixiviant in the bioleaching was shown to be gluconic acid. The red pigment produced by the fungus could also possibly act as an agent in Al leaching
  6. Keywords:
  7. Penicillium simplicissimum ; Spent catalyst ; Batch culture ; Extraction yield ; Gluconic acids ; Hydrocracking catalysts ; Multi-metals ; Batch cell culture ; Bioleaching ; Catalysts ; Metal ions ; Hydrocracking ; Iron ; Molybdenum ; Nickel ; Polyketide ; Red pigment ; Unclassified drug ; Biochemical composition ; Catalyst ; Experimental study ; Fungus ; Heavy metal ; Leaching ; Pigment ; Controlled study ; Extraction ; Fungus culture ; Incubation time ; Nonhuman ; PH ; Priority journal ; Biodegradation, Environmental ; Biomass ; Catalysis ; Environmental Pollutants ; Hydrogen-Ion Concentration ; Industrial Waste ; Penicillium ; Recycling ; Tungsten ; Fungi
  8. Source: Bioresource Technology ; Volume 102, Issue 2 , January , 2011 , Pages 1567-1573 ; 09608524 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0960852410014690