Review
Colloid mobilization and transport in groundwater

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Abstract

Recent field and laboratory experiments have identified colloid-facilitated transport of contaminants as an important mechanism of contaminant migration through groundwater. For colloid-facilitated transport to be important, three criteria must be met: (1) colloids must be generated; (2) contaminants must associate with the colloids; and (3) colloids must be transported through the groundwater. Significant progress in the understanding of colloid generation (by mobilization of existing colloids) and transport (limited by deposition) in model colloid and collector systems has been made in the past few decades. This knowledge of the model systems, however, is inadequate for prediction of colloid behavior in natural groundwater systems. An understanding of colloid behavior in natural systems is essential for predicting the potential for colloid-facilitated transport in a given groundwater. This review presents theories describing colloid mobilization, deposition, and transport, laboratory experiments in model systems designed to test these theories, and applications of these theories to colloid mobilization and transport experiments in natural groundwater systems. Emphasis is placed on mobilization of existing colloids by chemical and physical perturbations, the kinetics and dynamics of colloid deposition (filtration) and the “blocking” effect, and the effect of surface chemical heterogeneities on colloid deposition and transport.

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