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Comparison of Adsorption Characteristics of Waste Biomass Materials for the Removal of Pb ions from Industrial Effluents

Author:

B. M. W. P. K. Amarasinghe

University of Moratuwa, LK
About B. M. W. P. K.

Senior Lecturer, Department of Chemical and Process Engineering

BSc (Eng) (Moratuwa), MSc., PhD (UK), AMIESL

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Abstract

Adsorption of lead ions from aqueous solutions onto various waste biomass materials was studied. Coir pith, saw dust, rice husk, rice bran and tea waste were tested for Pb ion adsorption to enable comparison with alternative commonly used adsorbent granular activated carbon. Batch experiments were conducted to determine the adsorption capacities and kinetics of the process. All the waste biomass materials tested were capable of binding appreciable amounts of Pb ions from aqueous solutions. Adsorption capacities were in the order, coir pith> tea waste> activated carbon> rice bran> saw dust> rice husk. The equilibrium data were satisfactorily fitted to Langmuir and Freundlich isotherms. Langmuir monolayer adsorption capacities for coir pith, tea waste and granular activated carbon were 72, 65 and 28 mg/g respectively. Kinetic studies revealed that Pb uptake was fast with 90% or more of the adsorption occurring within first 15 to 20 min of contact time. The kinetic data fits to pseudo second order model with regression coefficients greater than 0.99. Fixed bed column experiments were performed to study practical applicability and breakthrough curves were obtained. Column operations showed lower adsorption capacities than the batch operation. Amount of Pb adsorbed in the column operations were 46, 41 and 19 mg/g for tea waste, coir pith and granular activated carbon respectively.
How to Cite: Amarasinghe, B.M.W.P.K., (2007). Comparison of Adsorption Characteristics of Waste Biomass Materials for the Removal of Pb ions from Industrial Effluents. Engineer: Journal of the Institution of Engineers, Sri Lanka. 40(4), pp.167–174. DOI: http://doi.org/10.4038/engineer.v40i4.7169
Published on 30 Oct 2007.
Peer Reviewed

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