A Kinetic Approach to Modeling Adsorption in Bank Filtration

Kim, Ik-jae; Kim, Seung-hyun; Park, Yung-kyu; Lee, Chul-hee; Kong, In-chul

Environmental Engineering Research 1997;2(3): 151-157.

Ik-jae Kim^†, Seung-hyun Kim, Yung-kyu Park, Chul-hee Lee, and In-chul Kong

Department of Environmental Engineering, Yeungnam University, Kyungsan, 712-749 S. Korea

Corresponding Author: Ik-jae Kim ,

Received: July 13, 1996; Accepted: April 13, 1997.

ABSTRACT

Bank filtration of river water can be a promising method for the high quality and stable raw water supplies. Chemical adsorption among other mechanisms is responsible for the retardation of migration velocity of organic pollutant in the media which can be included in river water resulting from accidental spills or industrial activities. In bank filtration, the ground water flow velocity is rather higher than those in most other aquifers due to the large hydraulic conductivity of natural sand filter formed along the rivershore and due also to the high pumping rate at the wells. In these circumstances, the adsorption and desorption rates of organic pollutant on solid grains in the aquifer are not so rapid in comparison to the ground water velocity, which indicates that the migration of the organic pollutants should be interpreted with kinetic approaches. In this study, 1,2-dichloroethane was employed as a model pollutant to investigate the migration and sorption behavior of the organic pollutants in bank filtration. Modeling of the process was attempted to generalize the results and to compare the results with the local equilibrium assumption. Sensitivity analysis was performed on several model parameters. Results show that there may be not negligible errors in the local equilibrium assumption and the presence of organic carbon in the aquifer material can greatly reduce the migration velocity of the organic pollutants.

Keywords: bank filtration | kinetic approach | 1.2-dichloroethane | migration and sorption behavior