Modeling Of Copper(ii) Biosorption By Marine Alga Sargassum Sp. In Fixed-bed Column

The biosorption of copper(II) by the marine alga Sargassum sp. was investigated in a batch reactor and in a fixed-bed column (temperature= 30°C; pH 3.5). Langmuir and Freundlich sorption models were used to represent the equilibrium data. Experimental breakthrough curves in a fixed-bed column were obtained with a flow rate of 6 ml/min and feed concentration of 1, 2, 3 and 6 meq/l. A model that describes the dynamics of copper(II) ion sorption in the column was obtained from the mass balance in the fluid phase and the biosorbent. According to mass transfer three equations are available to represent the rate of adsorption. The model parameters: mass transfer coefficients, axial dispersion coefficients and constants of the kinetic equation, had their values adjusted from the experimental breakthrough curves. The model in which the mass transfer is controlled by diffusion in the biosorbent best represented the fixed-bed column dynamics. © 2002 Elsevier Science Ltd. All rights reserved.385791799Wilde, E.W., Benemann, J.R., Bioremoval of heavy metals by the use of microalgae (1993) Biotechnology Advances, 11, pp. 781-812Sandau, E., Sandau, P., Pulz, O., Heavy metal sorption by microalgae (1996) Acta Biotechnologica, 16, pp. 227-235Chong, K.H., Volesky, B., Description of two-metal biosorption equilibria by Langmuir type models (1995) Biotechnology and Bioengineering, 47, pp. 451-460Schiewer, S., Volesky, B., Modeling multi-metal ion exchange in biosorption (1996) Environmental Science and Technology, 30, pp. 2921-2927Çetinkaya, G., Donmez, Z., Aksu, Z., Ozturk, A., Kutsal, T., A comparative study on heavy metal biosorption characteristics of some algae (1999) Process Biochemistry, 34, pp. 885-892Silva, E.A., (2001) Estudo da Remoção Dos Íons Cromo(III) e Cobre(II) em Colunas de Leito Fixo Utilizando a Alga Marinha Sargassum sp. Como Biossorvente, , Ph.D. thesis, Universidade Estadual de Campinas, Campinas, BrazilCossich, E.S., (2000) Biossorção de Cromo(III) Pela Biomassa da Alga Marinha Sargassum sp., , Ph.D. thesis, Universidade Estadual de Campinas, Campinas, BrazilTrujillo, E.M., Jeffers, T.H., Ferguson, C., Stevenson, H.Q., Mathematically modeling the removal of heavy metals from a wastewater using immobilized biomass (1991) Environmental Science and Technology, 25, pp. 1559-1565Volesky, B., Prasetyo, I., Cadmium removal in a biosorption column (1994) Biotechnology and Bioengineering, 43, pp. 1010-1015Kratochvil, D., Volesky, B., Demopoulos, G., Optimizing Cu removal/recovery in a biosorption column (1997) Water Research, 31, pp. 2327-2339Matos, M.G.N., Knoechelmann, A., Abreu, C.A.M., Passavante, J.Z., Silva, V.L., Bioadsorção/troca iônica de soluções de cromo com algas arribadas (1998) Anais do II Encontro Brasileiro sobre Adsorção, , Florianópolis-SC, JunhoKratochvil, D., Volesky, B., Advances in biosorption of heavy metals (1998) Trends in Biotechnology, 16, pp. 291-300Ruthven, D.K., (1984) Fundamental of Adsorption and Adsorption Process, , New York: WileyMaliska, C.R., (1995) Transferência de Calor e Mecânica Dos Fluidos Computacional, , LTC Livros Técnicos e Científicos Editora SA, Rio de JaneiroPetzold, L.R., (1982) A Description of DASSL: A Differential/Algebric Equation System Solver, , STR, SAND82-8637, LivermoreMadras, G., Thibaud, C., Erkey, C., Akgerman, A., Modeling of supercritical extraction of organics from solid matrices (1994) American Institute of Chemical Engineering Journal, 40, pp. 777-788Ernest M.V., Jr., Whitley, R.D., Ma, Z., Linda Wang, N.H., Effects of mass action equilibria on fixed-bed multicomponent ion-exchange dynamics (1997) Industrial Engineering Chemical Research, 36, pp. 212-226Klamer, K., Van Krevelen, D.W., Studies on ion-exchange-I (1958) Chemical Engineering Science, 7, pp. 197-20