No abstract

This paper concerns contaminant transport in aquifers comprised of fractured permeable media. In the framework of the present study a simplified method for quantitative evaluation of contaminant transport in fractured permeable media is developed. It is considered that the fracture network is characterized by two length scales, representing parts parallel and perpendicular to the flow direction. In the perpendicular part (transverse) of the fracture network an intensive mixing between the fracture flow and the permeable block flow takes place. Parameters governing this process are defined. It is shown that this process leads to contaminant dispersion. Characteristics of the contaminant transport process are defined and calculated.

This study represents a possible approach for the determination of the parameters characterizing the efficiency of surfactant mix for the remediation of soil and aquifers contaminated by entrapped non aqueous phase liquid (NAPL). The method incorporates the performance of two sets of experiments and their appropriate analysis. In one set, called the “vessel experiments”, the CMC of the surfactant mix is determined. The second set of experiments is called the “flow experiments”. In this set of experiments soil columns are contaminated by entrapped NAPL. Water flows through these columns with various types of surfactant mix solutions. According to the soil permeabilityvariation and the dissolved NAPL concentration in the water leaving the soil column, the effect of the surfactant mix on the coefficient of mass transfer is determined.