Model Development and Application for Colloid and Contaminant Transport in Groundwater

• Main Authors: Huang, Chiao-chung, 黃教忠
• Other Authors: 葉弘德
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/44483958044224184306

碩士 === 國立交通大學 === 環境工程與科學系 === 84 === Recent researches indicated that the presence of colloid in groundwater aquifer may increase the mobility of contaminant. Two mathematical models, the equilibrium model and the kinetic model, was developed to investigate the behavior of the colloid and contaminant transports and the adsorption process in porous media. These two models are composed of the transport equation and the adsorption equations. The equilibrium model was formed with one of the equilibrium adsorption equation and the kinetic model was formed with the kinetic equation. Numerical models were obtained by finite difference approximation using the central difference scheme and verified with the available solutions of the mathematical models. Compared with experimental data of colloid such as kaolin, algae and dissolved organic matter (DOM) in a column test, the simulated results indicate that the kinetic model yields better results than those of the equilibrium model. A significantly error was incurred in the simulation results of the contaminant transport model when neglecting the effect of contaminant adsorbed on mobile colloid. Good simulation results were obtained when the effect of the mobile colloid was considered in the contaminant transport models. The models are basically composed of both the kinetic and equilibrium adsorption, the kinetic adsorption is used to describe the relationship between the colloid and the solid matrix and the equilibrium adsorption is used to depict the relationship of the contaminant with the colloid and solid matrix. The simulation results indicate that a considerably amount of contaminant are adsorbed on the mobile colloid. Accordingly, it is more realistic to include the presence of mobile colloid when simulating the contaminant transport in groundwater.