Mathematical models applied to the Cr(III) and Cr(VI) breakthrough curves |
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Authors: | Ramirez C Margarita Pereira da Silva Mônica Ferreira L Selma G Vasco E Oscar |
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Affiliation: | Universidad Pontificia Bolivariana, Facultad de Ingeniería Química, CIBIOT, Circular 1a, N 70-01 Medellín, Colombia. mramirez@upb.edu.co |
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Abstract: | Trivalent and hexavalent chromium continuous biosorption was studied using residual brewer Saccharomyces cerevisiae immobilized in volcanic rock. The columns used in the process had a diameter of 4.5 cm and a length of 140 cm, working at an inlet flow rate of 15 mL/min. Breakthrough curves were used to study the yeast biosorption behavior in the process. The saturation time (ts) was 21 and 45 h for Cr(III) and Cr(VI), respectively, and a breakthrough time (tb) of 4 h for Cr(III) and 5 h for Cr(VI). The uptake capacity of the biosorbent for Cr(III) and Cr(VI) were 48 and 60 mg/g, respectively. Two non-diffusional mathematical models with parameters t0 and sigma were used to adjust the experimental data obtained. Microsoft Excel tools were used for the mathematical solution of the two parameters used. |
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