The present study investigates how the sawdust material affects the biological treatment and biological clogging in porous media.<BR>Serial data from soil-sawd u st column experiments were used to develop a model to describe the biological treatment and biological clogging processes in porous media. A model was developed simulating solute transport with biological treatment in soil-sawdust experimental columns including biological clogging processes. The transport part of the model solves the advection dispersion differential equations and the reaction part describes the heterotrophic metabolisms of several groups of bacteria. To simulate the biological clogging effects, the changes in porosity are calculated by converting biomass into volume, which directly reduces the porosity.<BR>Developed model could be evaluated experiment results. And it is confirmed that sawdust materials could be expected as the materials which could be encouraged biological treatment and improved the hydraulic conductivity.