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Investigations on Cationic Exchange Capacity and Unused Bed Zone according to operational conditions in a Fixed Bed Reactor for water lead removal by a natural zeolite

Author(s): Fanfan PN. | Mabon N. | Thonart P. | Lognay G. | Copin A. | Barthélemy JP.

Journal: Biotechnologie, Agronomie, Société et Environnement
ISSN 1370-6233

Volume: 10;
Issue: 2;
Start page: 93;
Date: 2006;
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Keywords: Cationic Exchange Capacity | Unused Bed Zone | clinoptilolite | Fixed Bed Reactor | zeolite

In this study, attention has been focused on the behaviour of the Cationic Exchange Capacity (CEC) and the Unused Bed Zone (UBZ), according to the operating parameters (bed length: L, column diameter: D, particle diameter: d and fl ow rate: Q) in a Fixed Bed Reactor (FBR). The investigations are performed for a single-component study of lead on New Zealand clinoptilolite at 25 ± 1°C. The results show a constant operating CEC of 1.00 ± 0.015 meq.g-1 which is independent of the operational parameters listed above. The performance of the operations expressed as UBZ, shows an optimum for the ratio L/D (bed length and column diameter) fi xed at 18.1, for Q = 2.9 BV.h-1 (bed volume per hour) and particle diameter d = 0.38 mm (the ratio particle diameter on column diameter d/D at 0.057). This maximum performance is reached with the lowest UBZ value of 5.6% of the operating CEC. Overall interpretation drawn from the results according to UBZ shows that decreasing the particles size improves the performance of ion exchange process; as well as decreasing the fl ow rate. Nevertheless, the increase of L/D to a certain extent does not improve ion exchange performances.
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