Modeling of copper fixed-bed biosorption from wastewater by Posidonia oceanica

Biosorption of copper from aqueous solutions by Posidonia oceanica was investigated in batch and fixed-bed experiments. Batch experiments were conducted to evaluate the removal equilibrium at pH 5.0 and 6.0; experimental data were fitted to Langmuir model with maximum uptake capacities of 56.92 and...

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Bibliographic Details
Published in:Bioresource technology 2010, Vol.101 (2), p.510-517
Main Authors: Izquierdo, Marta, Gabaldón, Carmen, Marzal, Paula, Álvarez-Hornos, Francisco Javier
Format: Article
Language:English
Subjects:
Alismatales
Alismatales - metabolism
Applied sciences
aqueous solutions
batch systems
Biological and medical sciences
Biosorption
Biotechnology
continuous systems
Copper
Copper - isolation & purification
Copper - metabolism
effluents
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
heavy metals
Mass transport model
mathematical models
Models, Theoretical
phytoremediation
Pollution
Posidonia oceanica
simulation models
Tracer
wastewater treatment
Wastewaters
Water Pollutants, Chemical - isolation & purification
Water Pollutants, Chemical - metabolism
Water treatment and pollution
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Summary:Biosorption of copper from aqueous solutions by Posidonia oceanica was investigated in batch and fixed-bed experiments. Batch experiments were conducted to evaluate the removal equilibrium at pH 5.0 and 6.0; experimental data were fitted to Langmuir model with maximum uptake capacities of 56.92 and 85.78 mg g −1, respectively. Five column experiments were carried out at different feed concentrations. Breakthrough times and continuous sorption isotherm were obtained from breakthrough curves. Differences among batch and continuous isotherms were observed; the maximum uptake capacity in dynamic conditions was found in 56.70 mg g −1 for final pH between 5.0 and 5.5. The biosorbent was regenerated with HCl. Hydrodynamic axial dispersion was estimated by tracing experiments at different velocities using LiCl as tracer. A mass transport model including convection–dispersion and sorption processes was successfully applied to breakthrough curve modeling. Results indicate that P. oceanica can be used as an effective biosorbent for copper removal.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2009.08.018