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Research:
Microbial mobilization and biotransformation of arsenic in municipal landfills.
Agricultural chemicals as a major non-point source of arsenic: microbial transformation of organic arsenicals.
Application of sulfate-reducing bacteria for the biomineralization of heavy metals.
Biological removal of Cu in wastewaters from semiconductor manufacturing: part of this work is supported by the
NSF/SRC sponsored (Engineering Research Center for Environmentally Benign Semiconductor Manufacturing
).
Hydrogen sulfide as the main electron donor for denitrification of petroleum refinery effluents: A novel approach for simultaneous removal of S, N and C.
Currently, Dr. Sierra is developing the web site for knowledge transfer - Anaerobic granular sludge bed reactors for sustainable development.
The University of Arizona
Department of Chemical and Environmental Engineering
JW Harshbarger Bldg
PO Box 210011
Tucson, Arizona 85721