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The use of protonated Sargassum muticum as biosorbent for cadmium removal in a fixed-bed column

The use of protonated Sargassum muticum as biosorbent for cadmium removal in a fixed-bed column
The use of protonated Sargassum muticum as biosorbent for cadmium removal in a fixed-bed column
The protonated Sargassum muticum seaweed was studied as a possible biosorbent for cadmium removal in a fixed-bed column. The experiments were conducted in order to determine the effect of flow rate (0.42, 5, 10 and 20 mL min(-1)) and bed height (0.6 and 15.3 cm for the lowest flow rate or 7.4, 13 and 16.6 cm for the others) on breakthrough curves behaviour. The determined breakthrough and exhaustion times increased with the diminution in flow rate and with the increase in bed height. The maximum cadmium uptake capacity, obtained from the area below adsorbed cadmium concentration versus time curves, was found to remain practically constant with bed depth and flow rate. The bed depth service time (BDST) model was applied to analyse experimental data, determining the characteristic process parameters. The optimal lowest sorbent usage rate was evaluated at 2 min contact time and the minimum bed height values necessaries to prevent the effluent solution concentration from exceeding 0.02 mg L-1 at zero time were 5.3, 6.9 and 7.5 cm for flow rates of 5, 10 and 20 mL min(-1), respectively. Several empirical models proposed in the literature (Bohart-Adams, Yan, Belter and Chu models) were investigated in order to obtain the best fit of column data, describing in a simple manner the breakthrough curves. A correlation between model parameters and the variables implied in the process was attempted.
Sargassum muticum, fixed-bed column, cadmium, biosorption, modelling
0304-3894
244-253
Lodeiro, P.
2a3db327-ecb7-4c32-bc61-13e01aed7182
Herrero, R.
ee7f0139-d8ac-4084-a73e-5eaa91b2e29a
Sastre de Vicente, M.E.
2bd016ef-20cf-4fb4-9282-1ca22142bcb4
Lodeiro, P.
2a3db327-ecb7-4c32-bc61-13e01aed7182
Herrero, R.
ee7f0139-d8ac-4084-a73e-5eaa91b2e29a
Sastre de Vicente, M.E.
2bd016ef-20cf-4fb4-9282-1ca22142bcb4

Lodeiro, P., Herrero, R. and Sastre de Vicente, M.E. (2006) The use of protonated Sargassum muticum as biosorbent for cadmium removal in a fixed-bed column. Journal of Hazardous Materials, 137 (1), 244-253. (doi:10.1016/j.jhazmat.2006.01.061).

Record type: Article

Abstract

The protonated Sargassum muticum seaweed was studied as a possible biosorbent for cadmium removal in a fixed-bed column. The experiments were conducted in order to determine the effect of flow rate (0.42, 5, 10 and 20 mL min(-1)) and bed height (0.6 and 15.3 cm for the lowest flow rate or 7.4, 13 and 16.6 cm for the others) on breakthrough curves behaviour. The determined breakthrough and exhaustion times increased with the diminution in flow rate and with the increase in bed height. The maximum cadmium uptake capacity, obtained from the area below adsorbed cadmium concentration versus time curves, was found to remain practically constant with bed depth and flow rate. The bed depth service time (BDST) model was applied to analyse experimental data, determining the characteristic process parameters. The optimal lowest sorbent usage rate was evaluated at 2 min contact time and the minimum bed height values necessaries to prevent the effluent solution concentration from exceeding 0.02 mg L-1 at zero time were 5.3, 6.9 and 7.5 cm for flow rates of 5, 10 and 20 mL min(-1), respectively. Several empirical models proposed in the literature (Bohart-Adams, Yan, Belter and Chu models) were investigated in order to obtain the best fit of column data, describing in a simple manner the breakthrough curves. A correlation between model parameters and the variables implied in the process was attempted.

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More information

Published date: 1 September 2006
Keywords: Sargassum muticum, fixed-bed column, cadmium, biosorption, modelling
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 355095
URI: http://eprints.soton.ac.uk/id/eprint/355095
ISSN: 0304-3894
PURE UUID: dcbb2bc6-88b1-4ec4-8a8e-64993049e9d9

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Date deposited: 30 Jul 2013 09:47
Last modified: 14 Mar 2024 14:28

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Contributors

Author: P. Lodeiro
Author: R. Herrero
Author: M.E. Sastre de Vicente

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