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EFFECT OF THE PRESENCE OF CO-IONS ON THE KINETICS OF BIOSORPTION OF CADMIUM FROM AQUEOUS SOLUTIONS BY SOLID ACTIVATED SLUDGE: EXPERIMENTAL STUDY AND MODELING EFFET DE LA PRESENCE DE CO-IONS SUR LA CINETIQUE DE BIOSORPTION DU CADMIUM EN SOLUTION AQUEUSE PA


HOUCINE BENAISSA*, MOHAMED-AMINE ELOUCHDI
LABORATOIRE DE MATÉRIAUX SORBANTS ET TRAITEMENT DES EAUX, DÉPARTEMENT DE CHIMIE, FACULTÉ DES SCIENCES, UNIVERSITÉ DE TLEMCEN, B.P. 119, 13000 TLEMCEN, ALGERIE *CORRESPONDING AUTHOR: HO_BENAISSA@YAHOO.FR

Issue:

SCSCC6, Volume IX, No. 1

Section:

Volume IX, No. 1 (2008)

Abstract:

Our previous work has shown that dried activated sludge has the aptitude to remove important quantities of cadmium ions from simple synthetic aqueous solutions. In continuation, the present study describes the results of the experimental investigation and modelling of the influence of the different co-ions presence such as: cations (Na+, K+ and Ca2+) and anions (Cl-, SO42- and CO32-), at various initial concentrations, on cadmium biosorption kinetics by dried activated sludge, in batch conditions at 25 °C and natural initial pH of solution. The choice of these ions has been made because of their permanent presence in industrial wastewaters. As results obtained, the presence of these co-ions in solution was found to inhibit the uptake of cadmium by dried activated sludge at different degrees. Na+ and Cl- ions have no significant/weak effect. For K+, Ca2+, SO42- and CO32- ions, the effects ranged from an inhibition of cadmium by K+, CO32- and SO42- ions to a weak inhibition by Ca2+ ions. The results also showed that the kinetics of biosorption of cadmium by dried activated sludge was described by a pseudo-second order rate model.

Keywords:

biosorption, cadmium, dried activated sludge, kinetics, effect of co-ions, modeling.

Code [ID]:

CSCC6200809V01S01A0007 [0002057]

DOI:

Full paper:

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