Adsorptive removal of Escherichia coli bacteria by Natural and Modified kaolin: Characteristics, isotherm, kinetic and SEM studies

B. Meroufel, M.A. Zenasni, B. George

Abstract


The adsorption of Escherichia coli bacteria on natural and modified kaolin was investigated as a function of contact time, initial bacterial load, pH and temperature using batch studies. Maximum retention of E.coli was done at pH 4 and at a temperature of 30°C. The adsorption capacities of the modified kaolins KC (92%) and KS (98%) were greater than natural kaolin K08 (59%). The linear models of Langmuir and Freundlich were applied to describe the equilibrium isotherms and Freundlich equation was more in line with the experimental results. The adsorption processes followed pseudo-second order kinetics and a multilayer regime, which was confirmed by the SEM images which show that E. coli is adsorbed alone or in the form of aggregates on the clay or on mesoporous surfaces. The results obtained in this study will provide valuable information for a better understanding of the mechanisms of mineral-microorganism interactions in soil and associated environments.Experiences demonstrated also excellent hydraulic performance of these supports, which can make them an inexpensive alternative, eager for toxicity in the field of water treatment.


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