Reactive oxygen species generated in the presence of fine pyrite particles and its implication in thermophilic mineral bioleaching

Applied Microbiology and Biotechnology
G C JonesS T L Harrison

Abstract

In the tank bioleaching process, maximising solid loading and mineral availability, the latter through decreasing particle size, are key to maximising metal extraction. In this study, the effect of particle size distribution on bioleaching performance and microbial growth was studied through applying knowledge based on medical geology research to understand the adverse effects of suspended fine pyrite particles. Small-scale leaching studies, using pyrite concentrate fractions (106-75, 75-25, -25 μm fines), were used to confirm decreasing performance with decreasing particle size (D 50 <40 μm). Under equivalent experimental conditions, the generation of the reactive oxygen species (ROS), hydrogen peroxide and hydroxyl radicals from pyrite was illustrated. ROS generation measured from the different pyrite fractions was found to increase with increasing pyrite surface area loading (1.79-74.01 m(2) L(-1)) and Fe(2+) concentration (0.1-2.8 g L(-1)) in solution. The highest concentration of ROS was measured from the finest fraction of pyrite (0.85 mM) and from the largest concentration of Fe(2+) (0.78 mM). No ROS was detected from solutions containing only Fe(3+) under the same conditions tested. The potential of ROS to inhibit micro...Continue Reading

References

Aug 2, 1978·Journal of Molecular Evolution·C R WoeseG E Fox
Dec 1, 1995·FEMS Microbiology Letters·N P BurtonP R Norris
Mar 10, 2000·Applied Microbiology and Biotechnology·M NematiS T Harrison
Jan 5, 2002·Advances in Applied Microbiology·K B Hallberg, D B Johnson
Oct 7, 2003·Annual Review of Microbiology·James A Imlay
Dec 21, 2006·Particle and Fibre Toxicology·Corey A CohnMartin A A Schoonen
Feb 27, 2007·Applied and Environmental Microbiology·Stephan Bathe, Paul R Norris
Oct 25, 2007·Biochemical Society Transactions·B Halliwell
Mar 1, 2008·Particle and Fibre Toxicology·Corey A CohnMartin Aa Schoonen

❮ Previous
Next ❯

Citations

Feb 9, 2016·Journal of Biotechnology·Alonso FerrerGloria Levicán
Dec 8, 2015·Environmental Science & Technology·Man TongYanxin Wang
Jun 27, 2018·FEMS Microbiology Reviews·Christopher T StraubRobert M Kelly
Jul 6, 2014·Beilstein Journal of Nanotechnology·Carolina Gil-LozanoLuis Gago-Duport

❮ Previous
Next ❯

Related Concepts

Related Feeds

Bioinformatics in Biomedicine

Bioinformatics in biomedicine incorporates computer science, biology, chemistry, medicine, mathematics and statistics. Discover the latest research on bioinformatics in biomedicine here.