Breakthrough Curves and Column Design Parameters for Sorption of Lead Ions by Natural Zeolite

ISSN： 0959-3330

Source： Environmental Technology, Vol.25, Iss.9, 2004-09, pp. : 1009-1019

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Sorption of lead ions, by natural phillipsite (zeolite) has been studied in a laboratory-scale packed-bed column. Breakthrough curves were obtained under different operating conditions. Bed depth- service time (BDST) model was applied and parameters for column design were determined for lead ions at 5% breakthrough yielding BDST sorption capacity of 24.27–35.73 mg.g^-1, rate constant 2.80×10^-4 - 4.16×10^-4 dm³.mg^–1.min^–1, critical bed depth 4.02-10.37cm and sorbent exhaustion rate of 12–51.3 g zeolite per dm³ of treated solution over a flow-rate range of 14.15-36.80 cm.min^–1. Breakthrough times at C/C_o = 0.05 ranged from 5–100 min depending on flow rate and bed depth. External mass transfer is rate limiting in the initial stages of adsorption as indicated by agreement between Wolborska model and the experimental data in the low C/C_o region of the breakthrough curve.