Hexavalent Chromium Removal by Candida sp. in a Concentric Draft-Tube Airlift Bioreactor |
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Authors: | Flor de María Guillén-Jiménez Alma Rosa Netzahuatl-Muñoz Liliana Morales-Barrera Eliseo Cristiani-Urbina |
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Institution: | 1. Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, Mexico, DF, C.P. 11340, Mexico
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Abstract: | 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. |
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