Functional models for colloid retention in porous media at the triple line

摘要: Spectral confocal microscope visualizations of microsphere movement in unsaturated porous media showed that attachment at the Air Water Solid (AWS) interface was an important retention mechanism. These can aid resolving functional form rates colloids AWS interface. In this study, soil adsorption isotherm equations were adapted by replacing chemical concentration water as independent variable cumulative passing by. order increasing number fitted parameters, functions tested Langmuir isotherm, Logistic distribution, and Weibull distribution. The against colloid concentrations obtained from time series images acquired with a spectral for three experiments performed where either plain or carboxylated polystyrene latex microspheres pulsed small flow chamber filled cleaned quartz sand. Both moving retained quantified over time. fitting models to data, agreement improved model parameters. distribution gave overall best fit. logistic did not fit initial well but otherwise good. only longest well. results be explained initially when are first introduced rate is low. Once they act anchor point other attach thereby clusters form. available sites diminish, decreases.