TY - JOUR
T1 - Hexavalent chromium removal by Candida sp. in a concentric draft-tube airlift bioreactor
AU - Guillén-Jiménez, Flor De María
AU - Netzahuatl-Muñoz, Alma Rosa
AU - Morales-Barrera, Liliana
AU - Cristiani-Urbina, Eliseo
N1 - Funding Information:
Acknowledgments E. C.-U. is a fellow holder of a grant from the Comisión de Operación y Fomento de Actividades Académicas, Instituto Politécnico Nacional, Mexico City, Mexico. The authors gratefully acknowledge the financial support provided by the Secretaría de Investigación y Posgrado, IPN. The CONACyT awarded a graduate scholarship to one of the co-authors (F.M.G.-J.).
PY - 2009/11
Y1 - 2009/11
N2 - The main purpose of this work was to conduct a kinetic study on cell growth and hexavalent chromium [Cr(VI)] removal by Candida sp. FGSFEP in a concentric draft-tube airlift bioreactor. The yeast was batch-cultivated in a 5.2-l airlift bioreactor containing culture medium with an initial Cr(VI) concentration of 1.5 mM. The maximum specific growth rate of Candida sp. FGSFEP in the airlift bioreactor was 0.0244 h-1, which was 71.83% higher than that obtained in flasks. The yeast strain was capable of reducing 1.5 mM Cr(VI) completely and exhibited a high volumetric rate [1.64 mg Cr(VI) l-1 h -1], specific rate [0.95 mg Cr(VI) g-1 biomass h -1] and capacity [44.38 mg Cr(VI) g-1 biomass] of Cr(VI) reduction in the airlift bioreactor, with values higher than those obtained in flasks. Therefore, culture of Candida sp. FGSFEP in a concentric draft-tube airlift bioreactor could be a promising technological alternative for the aerobic treatment of Cr(VI)-contaminated industrial effluents.
AB - The main purpose of this work was to conduct a kinetic study on cell growth and hexavalent chromium [Cr(VI)] removal by Candida sp. FGSFEP in a concentric draft-tube airlift bioreactor. The yeast was batch-cultivated in a 5.2-l airlift bioreactor containing culture medium with an initial Cr(VI) concentration of 1.5 mM. The maximum specific growth rate of Candida sp. FGSFEP in the airlift bioreactor was 0.0244 h-1, which was 71.83% higher than that obtained in flasks. The yeast strain was capable of reducing 1.5 mM Cr(VI) completely and exhibited a high volumetric rate [1.64 mg Cr(VI) l-1 h -1], specific rate [0.95 mg Cr(VI) g-1 biomass h -1] and capacity [44.38 mg Cr(VI) g-1 biomass] of Cr(VI) reduction in the airlift bioreactor, with values higher than those obtained in flasks. Therefore, culture of Candida sp. FGSFEP in a concentric draft-tube airlift bioreactor could be a promising technological alternative for the aerobic treatment of Cr(VI)-contaminated industrial effluents.
KW - Airlift bioreactor
KW - Candida
KW - Cr(VI) reduction
KW - Hexavalent chromium [Cr(VI)]
KW - Pneumatic bioreactor
UR - http://www.scopus.com/inward/record.url?scp=70949106905&partnerID=8YFLogxK
U2 - 10.1007/s11270-009-0024-x
DO - 10.1007/s11270-009-0024-x
M3 - Artículo
SN - 0049-6979
VL - 204
SP - 43
EP - 51
JO - Water, Air, and Soil Pollution
JF - Water, Air, and Soil Pollution
IS - 1-4
ER -