title: Mathematical models applied to the Cr(III) and Cr(VI) breakthrough curves.
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.
authors.affiliation: Universidad Pontificia Bolivariana, Facultad de Ingeniería Química, CIBIOT, Circular 1a, N 70-01 Medellín, Colombia. mramirez@upb.edu.co
authors.forename: Margarita
authors.initials: M
authors.lastname: Ramirez C
authors.forename: Mônica
authors.initials: M
authors.lastname: Pereira da Silva
authors.forename: Selma G
authors.initials: SG
authors.lastname: Ferreira L
authors.forename: Oscar
authors.initials: O
authors.lastname: Vasco E
mesh_terms: D000327:Adsorption; D002857:Chromium / Q000737:chemistry*; D008962:Models, Theoretical; D012441:Saccharomyces cerevisiae; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion