Naslov
The effect of fixed bed depth on lead removal from aqueous solutions

Autori
Perić, Jelena ; Trgo, Marina ; Vukojević Medvidović, Nediljka ; Nuić, Ivona

Izvornik
Separation Science and Technology (0149-6395) 44 (2009), 13; 3113-3127

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
natural zeolite; lead; fixed bed; BDST approach

Sažetak
The effect of zeolite bed depth on lead removal by the column method has been examined. The results indicate that the increase of bed depth delays the breakthrough point and saturation point, and increases the empty bed contact time, EBCT, of the zeolite – lead solution, and the height of the mass transfer zone, hz. The deeper the bed, the lower the effect of axial dispersion on the mass transfer process. In order to be able to predict the time at which, for a given zeolite bed depth, the concentration in the effluent will not exceed the defined value, the bed depth service time, BDST, approach has been used. Experimentally obtained breakthrough curves for the flow rate of 1 ml/min were used to derive the BDST approach equations. The equations obtained were used, with success, to predict the behaviour of the system for flow rates of 2 and 3 ml/min. Model lines were used to calculate the values of hz. hz was found to increase with the flow rate, which indicates that the contact time, the zeolite – solution EBCT, is not sufficient. This may be attributed to the effect of axial dispersion on mass transfer on the zeolite-solution phase boundary.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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